See the Farmers’ Almanac Fall Forecast 2023: When Will Sweater Weather Arrive?
Congratulations on your Squash & Pumpkin harvests and Happy Halloween, Day of the Dead!
Brassicas are the SoCal winter veg garden winners!
LARGE BRASSICAS
Broccoli is the favorite Brassica and rightfully so per the nutrition it offers. Plants differ in size, head color and shapes, how heat tolerant they are, if you intend to let them over summer and make side shoot production, varies! To get value for the room Brocs take up, a lot of gardeners seek varieties that produce a lot of side shoots after the main head is taken. Some newer varieties produce side shoots before the main head is taken! These smaller heads are great steamed if large, or tossed with your salad if small. Do as you wish! Many of these newer varieties grow no more than 1 to 1 1/2′ tall, in other words, close to the ground rather than up on taller stalks. This means you can’t cut off the lower leaves to plant smaller plants underneath. So before you select varieties, take a look online at mature plant profile. You can still plant around them, just not under them. Keep that in mind when planning your layouts. Research has shown there are less aphids when you plant different varieties of brocs together! Probably true for other large Brassicas as well. Superb Broccoli!
Kale has become a have-to-have! Eat young leaves fresh in salads. Steam with other veggies over rice. High in Vitamin A and anti-cancer properties! Lovely varieties – green or purple, flat or curly leaves. They just keep growing. They are technically a biennial, 2 year plant. The first year is for production, the second they make seeds. But. In SoCal they can over winter several years. Or if we have exceptionally hot weather, they may bolt and make seeds the first year! You can end up with a pom pom style, a poof of small leaves on a tall bare stalk, especially the curly leaf or dinosaur kales. But they lose their verve, look tired, are tasteless, rather tortured. A fresh young kale in good soil will easily take up a 3′ footprint and produce thick tender vibrant leaves like crazy! What a difference. I hope you start fresh ones each year. They grow so quickly. You won’t lose any harvest time if you plant a baby at the base of the old one, then take the old one down when you are getting those sweet young leaves from the baby. I’ll bet you forgot how good they can really taste! Just be sure to work in some high quality compost so it can be strong and keep producing well. Beautiful Kale!
Cauliflower now comes in the standard white, also green, orange and purple! The disadvantage is there is only one head and that’s it, though as with any Brassica, the leaves are edible. Like Collard greens.
Cabbage is more dense for the dollar than Cauliflower though it too has only one head and takes a long time to grow – even the mini varieties! But what a feast! A cabbage head is amazing and you can fix it so many ways. Shred in salad, coleslaw, steamed, cabbage soup – Borscht, stir fried, cabbage rolls, cabbage kimchi, in tacos, as sauerkraut! Or try a traditional Irish dish, colcannon, a mixture of mashed potatoes, cabbage or kale, onions, and spices. YUM! There are many cabbage varieties as well – ‘white,’ red or green. Different sizes, and I do mean different. There are 4 to 6″ minis for container gardens, sooner eating or you just don’t need a huge cabbage. There are easily more than a foot in diameter monsters you can barely carry! First they grow loose, then they fill in and make hard dense heads. An amazing plant! While your cabbages are putting on size, plant lettuces among them and other Brassicas. Lettuce repels cabbage moths. Magnificent Cabbages!
Brussels Sprouts are charming mini cabbages on a stalk! They like a colder climate to make big sprouts. In Santa Barbara SoCal area you need to be prepared to harvest lots of small ones. But, I have to tell you, the last couple years we have been getting sprouts up to almost 2″ diameter in two of our community gardens, so it wasn’t good soil that made the difference. The sprouts liked the weather or new more heat tolerant varieties are on board!
All these big Brassicas need feeding from time to time because they are big, and most of them are continuously producing leaf crops! They are all susceptible to Mildew. Try for resistant varieties. Water in the morning when possible so they can dry by evening. A good reason not to over water or fertilize is aphids and whiteflies! They like softer plants. Use plenty of worm castings, as much as possible in their soil – as much as 25% if you can! Plant your Brassicas far enough apart, leaves not touching, for airflow when they are mature, so pests and diseases don’t easily spread plant to plant. Brassicas are generally frost tolerant, even a bit freeze tolerant, and it is said their flavor improves with a freeze!
Cilantro is their best companion! If you like the scent, winter, early spring are good times for cilantro. It doesn’t bolt so fast. Summer it bolts, winters it will freeze, so replants go with the territory. Cilantro makes brocs grow REALLY well, bigger, fuller, greener! Plant it just inside the mature drip line and let it grow up and through your Brassicas! The exception is cabbage since it can’t grow through cabbage. I grow cilantro even though I don’t eat it. I like how it looks and smells and it is a living mulch. When it seeds I scatter the seeds where I think I will be wanting some as companion plants and comes up where and when it wants if you keep the soil moist. Cilantro!
ENJOY LOTS OF SMALL BRASSICAS!
For salads arugula, bok choy, kohlrabi, mizuna, mustard, tatsoi, peppery sweet alyssum! Alyssum is a terrific little companion plant and attracts special small pollinators. Root crops are winter Daikon and White Icicle, pretty China Rose and handsome Long Black Spanish radish, turnips, rutabagas! Grow horseradish for fermenting. No need to allot special space for these except for the horseradish. It has a good 3′ diameter footprint! Plant these tasty small Brassicas in rows, between, among, around, in patches on the sunny side of big brassicas! A few here, a few there! Be artful with your design – sizes and colors. Enjoy their many flavors at your winter table! Same with other little winter types like onions, beets.
Then, there are all the other plants not Brassicas!
Peas – Flat, Snap or Pod
Flat is the same as Chinese or snow peas. String ’em or buy the stringless variety, and eat ’em right then and there or toss a few with your salad, steam or stew in Asian dishes, add to your stir fry! Shelling or English peas are so delicious fresh out of the pod and mighty tasty steamed so fresh from the pod. SNAP peas are the sinful favorite of many. The pod is thick and tender, sweet and delicious! Few make it home from my garden. I just eat them. That’s why you get stringless varieties. Who wants to be picking their teeth at the garden, LOL?! Ok, if some of those snap peas do make it to the kitchen, add them to salads. If you must, lightly steam them, add them to stir fries. They are very tender. To keep their fresh green look, undercook….
Yellow, green or purple, you can get bush or pole peas! Bush peas come in sooner; pole peas grow tall, so come in later. Soon as your bush peas are done, the pole peas will come in shortly after, making for a steady supply. And the pole peas keep on coming. Compared to beans or tomatoes, peas have a shorter life span. And when they are done, they are done. Fertilizing, coaxing, additional water doesn’t help. Successive planting is the answer. Plant once a month or so if you love peas. You do have to keep them picked or, like beans, they stop producing. They have short roots and need to be kept moist. Onion family stunts peas! But carrots enhance peas! Plant carrots around the cage or along the trellis. If you plant carrots on one side of them, trench peas a tad lower. Water the pea side so the carrots don’t get too much water and split.
Peas are the winter legume as beans are the summer legume of your garden! They are the trellis plants of our winter gardens. Put in your trellis first, then plant pole seeds, plus transplants of bush and pole all at the same time for them to come in one after the other. Your bush peas in cages will produce first, then your pole peas, and likely your seeded pole peas will follow in short order. Soon as your peas are done, clip off the plant, leaving the roots with their Nitrogen nodules in the ground to feed your soil. The Nitrogen is only released from the nodules after the plant has died. Plant more!
Presprouting your pea seeds makes sense! Presprouting assures no spots will be empty where a seed didn’t come up and you lose production! Presprouting peas is super simple. Paper towel on plate, lay out peas an inch apart, fold the paper towel over them, spritz with clean water, keep them moist. By +/- 5 days they will have sprouted, some more than others! Carefully put the ones that sprouted in the ground so you don’t break the little roots. If you have hungry birds, cover the sprouted peas with aviary wire soon as you put them in the ground. A smart trick is to plant them in a slight low sloped mini trench. Moisture goes to the bottom of the trench, drying wind goes over the top of the trench. When you are planting while it is still warm in late fall, if you are planting from sprouts, very carefully cover the soil with a very fine mulch to keep the soil moist. Planting from seed do the same cover the soil lightly. The sprouts will emerge and grow through the mulch. You can cover the trench with a board on top of the aviary wire. It’s high enough so the sprouts can get some size. Be sure there is a tad of airflow so the sprouts under the board are not baked! Delicious Peas! As with any seeds or transplants, a couple days before planting put down organic slug/snail bait and remove any overnight marauders that would feast on your tiny new plants.
You can have a terrific time with beets! They thrive in cooler weather. Many colors! Grow the elongated winter biggies, Cylindra! Plant them at the same time you plant smaller varieties so you have the littles first, while you are waiting for the biggies! Early Wonder Tall Tops and Dutch Baby Ball are a tasty choices, or red cold hardy Flat of Egypt! Try a yellow like Touchstone Gold! All About Beets, So Sweet!
Chard is an elegant super productive winter favorite! Handsome, colorful, really, they are the ‘flowers’ of the winter garden! Superlative nutrition, low calorie, easy to grow! If you want quantity, plant Fordhook Giants! They are wondrous – easily 3′ tall, foot wide leaves when conditions are right for them! Chard can’t be beat for production per square foot. Elegant Nutritious Chard!
Lettuces thrive in cooler weather too, but do cover them at threatened heavy pelting rain storms and freezes. Lay down tomato cages, cover, and secure the cover so it doesn’t blow away. Remove when the day warms up. Lettuces come in all kinds of shapes and delicious colors. They do best in rich soil, regular moisture. Winter is the cooler time when tender butter leafs and heading varieties do well.
Try super dense Salanova! Johnny’s Seeds says: Harvested as fully mature heads, the flavor and texture have more time to develop than traditional baby-leaf lettuces. The unique structure of the core produces a multitude of uniformly sized leaves, harvestable with one simple cut. Salanova is more than 40% higher yielding, has better flavor and texture, and double the shelf life of traditional baby-leaf lettuce, making it an excellent, more economical option. What do you think about that?! Beautiful Lettuce!
Perfect timing for tasty root crops – beets, turnips, rutabagas, daikon radish. Beets are a double winner because the roots and the leaves are edible! Pick leaves from time to time. When your beets are the size you want, pull them and eat all the leaves and the beets as well!
Winter is growing time for long Daikon Radish. And Carrots. Carrots are a dense root, so they take a while. Plant short varieties like Thumbelina and Little Fingers for sooner eating. Kids love them! At the same time plant longer varieties to eat when the Little Fingers are done. Or plant successively, every 2 weeks, once a month per your needs. The longer the carrot, the longer it takes to grow. Look at the seed pack to see how many days it takes to maturity. Of course, you can pull them sooner and smaller, like for you and your pup! 🙂 Avoid manuring where you know you will be planting carrots – makes them hairy. Steady water supply and not too much or they split or fork. You might enjoy some of the mixed color packs – Circus Circus, Sunshine, or Cosmic Purple! Tasty Nutritious Carrots!
Parsnips, celery and parsley are all in the carrot family and enjoy cool SoCal weather. Celery is another in-the-garden edible let alone low calorie! Leeks and bunch onions, but, remember, NO onion family near peas.
If you haven’t planted already…some of you carry your layout plan in your head, others draw and redraw, moving things around until it settles and feels right. Do add a couple new things just for fun! Try another direction. Add some herbs, flowers for pollinators, or different edible flowers. Leave a little open space for surprises! Stand back, take a deep breath and ask yourself why you plant what you plant and why you plant the way you do. Anything been tickling the back of your mind you are curious about? More about Designing Your SoCal Winter Veggie Garden!
Once you have decided what to plant, when is the big question! Day length and temps are important. Temp sequences make a difference! Some plants bolt easily – Cilantro, Brassicas, Beets and Chard. Bolting is when your plant sends up a flowering stalk to seed. Check out Bolting aka Running to Seed! Causes and Prevention! Day Neutral/Photoperiodism
Where you plant, sun/shade is important. Plant longer maturing larger and taller varieties to the back, shorter early day varieties in front where they will get sun. Put littles on the sunny side of these. Plant your tall plants first, let them get up a bit. Then clip off the lower leaves on the sunny side and plant your littles. Or plant quick rounds of littles between, among the tall plants. They will be ready to harvest when the big plants would start shading them. A classic combo is lettuces among starting cabbages that take quite a while to make their big footprints!
Mixes rule! Plant several varieties for maturity at different times and to confuse pests. Pests are attracted at certain stages of maturity. They may bother one plant but leave others entirely alone depending on temps and the pest’s life cycle! There are less aphids on broccoli when you plant different varieties together. See Super Fall Veggies Varieties, Smart Companion Plantings! for excellent biodiverse choices.
Peas and green manure mixes – legumes and oats, feed and replenish your soil because they take N (Nitrogen) out of the air and deposit it in little nodules on their roots! If an area in your garden needs a pep up, plant it to green manure. Broadcast a seed mix of legumes and oats and let them grow. Bell beans, Austrian peas, vetch and oats from Island Seed & Feed Goleta is an excellent choice. Be sure to get the legume inoculant they recommend to use with it. The first three deposit N; the oats have deep roots that bring nutrients up and create soil channels for oxygen, water, soil organisms and roots! Plant it where next summer’s heavy feeders, like tomatoes, will be grown!
If you are planning for mid January bareroot strawberry planting, be preparing your strawberry patch now if you are planting green manure! The green manure mix I use takes 2+ months to grow. I chop it down when the bell beans start to flower. Chop it into bits, let it lay on the surface 2 weeks. Keep it moist. For strawberries and many other plants, add acidic (azalea/camellia) compost, worm castings and turn it all under at the same time. It takes two to three weeks to decompose, let the soil organisms restabilize, and be ready to plant. That puts us right at mid January when the bareroots arrive! More details on Living Mulch!
Here’s the schedule:
- Oct 1 plant your living mulch – put this on your garden calendar! If Bell beans are in your seed mix, or are your choice, they take a couple months to start to flower.
- About Dec 1 chop down/mow, chop up your living mulch and let it lay on the surface two weeks. This is necessary to let the dead plants release the Nitrogen from their roots. If Bell beans are in the mix, chop when they flower or before the stalks will get too tough to easily chop into small pieces. Keep your chopped mulch moist, not wet, until it is tilled in. Being moist aids decomposition.
- Mid Dec till in your living mulch for mid January bareroot planting. The little white balls on the roots are like a beautiful little string of pearls. Those are the Nitrogen nodules legume plants make that we are growing them for! At this time add any other amendments you want. Strawberries and many veggies like slightly acidic soil, so I add store bought Azalea/Camellia acid compost. It has little bark bits that add water holding capacity.
OR. Strawberry runner daughters can be clipped Oct 10 to 15, stored in the fridge for planting Nov 5ish in Santa Barbara. Remove any diseased soil where your beds will be; prep your beds with acidic compost like an Azalea mix. Commercial growers replace their plants every year. Some gardeners let them have two years but production of some varieties tapers off a lot the second year. Seascape, bred at UCSB, has excellent second year production! If you let them have two years, generously replenish the soil between the berries with acidic compost. I lay down boards between the rows where my berries will be planted. The boards keep the soil moist underneath. I planted the berries just far enough apart that they self mulched (shaded the soil) when they grew up a bit. Worked beautifully. I got the idea for the boards from a pallet gardener. If you use boards, just lift them, scoop out a little soil, add the new acidic compost.
Plant in super soil to get a good start! Clean up old piles of stuff, remove old mulches that can harbor overwintering pest eggs and diseases. Note whether your plant needs slightly acidic soil and add the right compost for that. Add the best-you-can-get composts, manures, worm castings. Worms casting are especially good in seed beds. They increase and speed germination and boost immunity. In planting holes, toss in a handful of nonfat powdered milk for immediate uptake as a natural germicide and to boost your plant’s immune system. Throw in a handful of bone meal that will decompose for uptake at bloom time, and some bird guano high in P in the NPK ratio, to extend bloom time after that. If you have other treats you like to favor your plants with, give them some of that too! If your soil has Verticillium or Fusarium Wilts, go lightly on incorporating coffee grounds either in your compost or soil. In studies, what was found to work well was coffee grounds at only 0.5 percent of the compost mix. Yes, that’s only 1/2 a percent! See more details about soil building! If you have containers, dump that old spent stuff and put in some tasty new mix!
Winter Feeding Lettuces like a light feed of chicken manure cultivated in the top 1/4 inch. All the winter plants are heavy producers – lots of leaves, some of those leaves are monsters! Cabbages are packed tight, leaf after leaf! They may need a light feed. Remember, it’s cooler now, so their uptake is slower, so give them liquid feeds of things easy for them to uptake. Fish emulsion (if you don’t have predators like raccoons or skunks) or a tasty tea mix – compost, worm castings, manure (no manure tea for lettuces). Slow release like alfalfa pellets.
Weather! Rain may be coming. Give your berms a check. Restore or add, shift their location if needed. Before wind or rain, double check cages and trellises, top heavy plants. Stake them, tie peas to the trellis or cage. More Rainy Weather Tips Start gathering sheets, light blankets for possible cold weather to come. Keep tomato cages handy. Protect Your Veggies from Freezing! Cover and tuck ’em in!
You don’t have to garden this winter!
- You can cover it deeply with all the mulch materials you can lay your hands on up to 18′ deep. Believe me, it will settle quickly. Let the herds of soil organisms do their work over winter. That’s called sheet composting or composting in place, lasagna gardening – no turning or having to move it when it’s finished. If you are vermicomposting, have worms, add a few handfuls to speed up and enrich the process. Next spring you will have rich nutritious living layers of whole soil for no work at all!
- If you have access to materials, another wise option is to do some form of long term sustainable Hugelkultur! There are many variations, quite adaptable to your situation. It can be done in a container, a tub, on a hillside, a field, in your own little garden plot!
- A third thing is to plant legumes and oats for superb soil restoration that takes some labor, but a lot less than tending your garden on a daily basis! You can plant it with green manure. Laying on lots of mulch is a ton of work when you do it, just gathering the materials can be a challenge. Green manure takes some work too, but it has awesome results as well. You broadcast a seed mix of legumes and oats, cover ever so lightly with soil, let them grow. Bell beans, Austrian peas, vetch and oats from Island Seed & Feed in Goleta is an excellent choice. Legumes gather Nitrogen from the air and store it in nodules on their roots! N is the main ingredient your plants need for their growth! The oat roots break up the soil. They dig deep and open channels for water and air flow, soil organisms, roots.
“Our most important job as vegetable gardeners is to feed and sustain soil life, often called the soil food web, beginning with the microbes. If we do this, our plants will thrive, we’ll grow nutritious, healthy food, and our soil conditions will get better each year. This is what is meant by the adage ‘Feed the soil not the plants.‘ – Jane Shellenberger, Organic Gardener’s Companion: Growing Vegetables in the West (Colorado)
Winter watering in drought areas is the same as for summer. Before 10:30 AM, after 4 PM. Watch which way water flows along the leaves. Some plants it flows to the central stem. Some drip water off the leaf tips in a circle around your plant, the dripline. Some go both ways. Make berms just beyond where the mature plant’s water flows. If at the dripline, that’s where the tiny feeder roots take up moisture and nutrients. That’s why they call them feeder roots! If your garden has a low spot, plant your water loving plants – chard, lettuces, spinach, mizuna, mints – there or near a spigot.
Fall Pests & Diseases
- Prevention Drench young plants, ones you just transplanted, with Aspirin solution to get them off to a great start! Drench your seedlings when they get up a few inches. One regular Aspirin, 1/4 C nonfat powdered milk, 1/2 teaspoon liquid dish soap (surfactant), per gallon of water. Aspirin triggers a defense response and stimulates growth! Powdered milk is a natural germicide and boosts the immune system. Be sure to get under the leaves too!
- Brassicas, Peas! Lots of ants and on Brassicas, lengthwise curling leaves are the giveaways for aphids, then whiteflies. Aphids carry viruses. Aphids come in fat gray or small black. Avoid over watering and feeding that makes for soft plants, tender leaves that aphids thrive on, and ant habitat. Spray aphids and whiteflies away, make the ants leave. Get up under those leaves, and fervently but carefully do the tender center growth tips. Do it consistently until they don’t come back. Cinnamon is amazing. Ants don’t like it at all, and when you are starting seedlings it prevents molds and damping off. Sprinkle it on the soil in your six pack. Get it in big containers at Smart and Final or bulk food stores. Reapply as needed. ASAP remove yellowing leaves that attract whiteflies.
- Chard, Lettuces, Spinach – Slugs and snails are the bane of so many crops, but these especially. Lay down something like Sluggo immediately. Then do it again in a week or so. Kill the parents, kill the children. After about 3 times you rarely need it again anytime soon.
- Biodiversity In general, avoid row planting where disease and pests wipe the plants out from one to the next to the next. Instead or rows, plant in several different spots. If you can’t help yourself, because your family always planted in rows or that’s the way farm pictures show plantings, remember, this is YOUR garden! Also, leave room so mature plants’ leaves don’t touch. Give them room to breathe, get good big leaves that get plenty of sun and produce lots more big leaves and many big fruits! Stunted crowded rootbound plants just don’t perform as well and are more disease and pest susceptible. Leaving that breathing room between plants pay off when you plant little plants along, under bigger plants. It’s like having two crops in the same space. No need to make separate space for smaller plants. There is no law that says you must plant in a straight line or a separate space! Forget the stakes and twine; plant where you want to! Use companion plants where they will do the most good!
Keep up with your maintenance. Weed so seedlings aren’t shaded out or their nutrients used up.
If you have lots of seeds, over planting is an age old practice. Plant too, too many, then thin them with tiny pointy scissors, aka harvest the young, and eat ’em! Young radish sprouts, teeny carrots – for you and your pup, beets, cilantro, arugula, onions, little Brassicas of all kinds are wonderful in a salad! If they get a little big, steam them or add to stir fries and stews. Another way to do it is plant flats of lettuces, Mesclun mixes, and mow them! Tender baby greens! They will grow back 3, 4 times.
Have it in the back of your mind what summer plants you will be wanting, where you will plant them. For example, plant more permanent plants like a broccoli you will keep over summer for side shoots (like All Season F1 Hybrid), or a kale that will keep on going, where they will not be shaded out by taller indeterminate summer tomatoes.
October is the last of Seed Saving time for most of us. Make notes on how your plants did, which varieties were the most successful. These seeds are adapted to you and your locality. Each year keep your best! Start sorting and labeling seed baggies on coming cooler indoor evenings. Store your keepers in a cool dry place for next year’s plantings. Generously gather seeds for upcoming January Seed Swaps!
Santa Barbara’s 16th Annual Seed Swap is January 26 2024 The last Saturday of January every year is National Seed Swap Day! Look in your area for an event, and if you don’t find one, collaborate with your neighbors, local garden clubs or permaculture group to get one going!
Plant gift plants or bowls or baskets for the holidays now! Make Lavender sachets! Put ribbons on some of your seed jars gifts. See Wonderful Gardener-Style Holiday Gifts!
Take a deep breath of this fine fall weather! Happy Gardening!
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Love your Mother! Plant bird & bee food! Think grey water! Grow organic! Bless you for being such a wonderful Earth Steward!
The Green Bean Connection started as correspondence for the Santa Barbara CA USA Pilgrim Terrace Community Garden. Both remaining Santa Barbara City’s community gardens are very coastal. Climate is changing, but it has been that during late spring/summer we are in a fog belt/marine layer area most years, locally referred to as the May grays, June glooms and August fogusts. Keep that in mind compared to the microclimate niche where your veggie garden is.
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PLANT COMPANION PLANTS THAT REPEL PESTS, or enhance your plant’s growth, IN ADVANCE SO THEY WILL BE UP AND WORKING WHEN YOUR SEEDLINGS COME UP OR YOU INSTALL YOUR TRANSPLANTS! Whenever you select seeds or transplants, automatically think companions, for many good reasons! See 
Beets, Chard and Spinach get Cercospora leaf spot – like the Chard at left. Sadly, no resistant cultivars of table beet are known. Late fall or early spring plantings are most likely to be affected. Late summer when conditions are favorable (high temperatures 75-85˚F, high humidity, long leaf wetness periods at night) is the worst. Beet roots fail to grow to full size when disease is severe. Successive plantings made close together can allow disease to move from one planting into the next. It grows on infected crop residues, so immediately remove leaves that collapse on the ground. It is spread by rain splash, wind, irrigation water, insects, gardeners, and equipment. This is one case where AM watering really makes sense to reduce humidity. UMASS Amherst recommends to ‘Avoid overhead irrigation if it will result in prolonged leaf wetness periods (e.g., through the night); irrigate mid-day when leaves will dry fully or use drip irrigation.’ If all that fails, use foliar fungicides. Plant less densely for more airflow, thinnings are tasty! In general, harvest more frequently so leaves don’t surpass their prime health, start to soften, become vulnerable. If you have little garden space, planting only every 3 years in the same spot isn’t possible so cultivating, turning and drying the soil between plantings is good. If possible adding a tiny bit of coffee grounds, a half a %, would help kill off the Spot. Too much coffee grounds can kill your plant, make your soil acidic. 
unless they are left in the ground a long time, get old and weak. Thinning helps keep pests and disease from spreading from one to the next.
Green Bean Connection 