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Water is the driver of Nature.  –   Leonardo da Vinci

When, Who, How, & How Much to Water

Midday, on a hot day, watering will burn the leaves.
Evening watering promotes mildew, fungus growth.  Plants drink during the day, so AM watering is best.

Plants that need little or no water and why:
Onions, garlic, that are flowering, going to bulb, needing to dry
End of season tomatoes that you want to have a stronger flavor
Tomatoes in soil with Fusarium and Verticillium Wilt fungi in the soil.  Fungi don’t do well in dry soil.

Plants that need water almost daily, sometimes twice daily 
Shallow rooted beans, beets, bunch onions, cucumbers, peas, strawberries
Celery and chard, lettuce, arugula – leaf crops, to keep them growing fast, tender and tasting sweet.
Planted seeds, seedlings, newly planted transplants, must be kept moist; if they dry, they die.  Put up temporary shade.

Use a watering can for seeds and tender seedlings so seeds aren’t washed away or seedlings broken.

Most plants need only an inch of water once a week unless it is hot and/or windy weather.  Most gardeners over water by two times as much as is needed!  Overwatering drowns plants, and kills micro soil organisms; they don’t get oxygen.  Soil structure is destroyed as air spaces cave in.  Overwatering also causes poor root growth making it difficult to move enough water to the leaves during hot weather.

Irregular watering results in misshapen fruits, tomato flower drop, can stop production

Fuzzy plants like tomatoes, eggplant, don’t do well with watering on their leaves.  Water underneath please.

Plants that are mulched generally need less water.  Poke your finger in the soil to see how deeply it is moist.  More on mulching next week.

Water and Pests & Diseases 

Overhead watering contributes to mildew on beans, squash, peas.  It spreads Strawberry Leaf Spot and other waterborne diseases 

Tomatoes:  stop watering when about a foot tall.  Water around them, but not right at them.  Keep back about a 2’ perimeter to reduce Fusarium and Verticillium Wilt fungi.  If you do water them, on mature plants, cut off the lower leaves, up to 18” high, to prevent soil splash when watering.  The fungi are especially taken up by leaves touching the ground.

Flush off aphids and the undersides of broccoli leaves and broc side shoots, kale leaves, especially the curly varieties.

Flush white flies from the undersides of broccoli leaves, kale, beans

BE JUICY!

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Powdery Mildew on Peas

Select powdery mildew resistant or tolerant varieties!

Cornell University’s lists of Disease Resistant Varieties

  • Longbeans
  • Green beans:  Provider, Merpatim, Parkit, Perkutut, Sriti
  • Cucumber: Diva, Cumlaude, Media F1.  Slicers:  Cornell’s list
  • Muskmelon:  Ambrosia F1, Primo (western type), Sun Jewel
  • Pea:
    • Ambassador – Resistant to powdery mildew, entation virus and fusarium wilt
    • Cavalier – Good resistance to powdery mildew.
    • Greenshaft – Resistant to downy mildew and fusarium wilt
    • Rondo – Resistant to fusarium wilt
    • Downy Mildew resistant peas:  Kelevdon Wonder, Oasis, Twinkle, Avola, Hurst Greenshaft, Ambassador, Cavalier and Peawee.
  • Pumpkin: 18 Karat Gold, Gladiator
  • Winter Squash:  almost all varieties
  • Yellow Summer Squash: Success, Sunray, Sunglo
  • Zucchini: Ambassador, Wildcat, Cornell’s list

Healthy Practices Make a Difference!

Plant in full sun!
Plant so leaves of one plant don’t touch another and spread the spores.
Remove any debris or dead leaves breeding habitat.
Remove and don’t compost infected leaves.  If  you don’t remove them, you reinfect your plant each time you water. 
Wash tools and your hands before you go from one plant to the next.
Water in the AM, at ground level.  No overhead watering.
BEFORE you have mildew, while your plants are still babies, drench the leaves with a baking soda/milk mix.  Tablespoon Soda, ¼ cup nonfat milk powder, drop of liquid dish detergent in a watering can.
Drench weekly with your mix.  But if you think you aren’t going to be able to get rid of the mildew, sadly, do the one cut prune.  Remove that plant so it won’t infect others – yours or your neighbors’.  Do this sooner than later.  Mildew is windborne, so the more mildew, the more is spread.

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