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JUNE Plant Care Checklist

Powdery mildew is common in warm, dry conditions. Photo: Courtesy UC Regents
Powdery mildew is common in warm, dry conditions. Photo: Courtesy UC Regents

Maintenance and prevention

  • Check soil moisture and adjust the watering schedule on your irrigation controller accordingly. Water early in the day. Watch container plants which may need daily watering.
  • Control powdery mildew, a fungus that likes dry summer conditions. Spray susceptible plants with a horticultural oil or biological fungicide.
  • Use pot feet or boards to elevate containers sitting on hot pavement.
  • Don’t forget to water houseplants as your attention focuses on the outdoors.
  • Check for standing water to keep mosquitoes from breeding.
  • Treat ponds with mosquito repellent.
  • Turn compost and keep it as moist as a wrung-out sponge. Add garden waste, grass clippings, pruning material, and leaves so long as they are not diseased.
  • Raise the cutting height of lawnmower 1 to 1.5 inches to help grass survive drought and heat (encourages deep roots and reduces water demand).
  • Leave lawn clippings on the ground for nutrients and as a mulch layer. Learn more about lawn care

Planting and propagating

  • Cut off spent flowers for continued bloom. (Consider leaving some for the birds.)
  • Stake tall plants such as dahlias, gladiolus, and lilies as needed.
  • Harvest blooming lavender to dry for indoor use.

Pests and weeds

  • Monitor and control snails, slugs, and aphids.
  • Use beneficial nematodes to manage grubs in your lawn.
  • Keep an eye out for early signs of insect infestation - blast any you see with a garden hose.
  • Set yellowjacket traps at the perimeter of the yard (not near eating areas) to discourage yellowjackets from visiting.

Feed and fertilize

  • Make compost tea for a mild liquid fertilizer.
  • Mulch shrubs and beds to conserve moisture.
  • Fertilize roses and other summer-blooming plants, if needed, using an organic fertilizer.
  • Use little or no fertilizer on herbs.
  • Feed azaleas, camellias, and rhododendrons with a balanced organic fertilizer formulated for acid-loving plants monthly during the spring and summer.


  • Thin fruit trees.
  • Thin fruit on apple trees.
  • Protect summer fruit crops with netting or row cover.
  • Plant beans, broccoli, chard, cucumbers, eggplant, ground cherries, melons, peppers, pumpkins, parsley, squash, tomatoes
  • In cooler areas, plant cabbage, celery, lettuce, bunching onions, and peas.
  • Learn more about crops to plant in June and other activities in the edible garden.