- Thin apples when ½” diameter.
- Mow general cleanup for fire protection..
- Mulch garden beds to retain moisture and encourage deep roots by deep and infrequent watering.
- Check sprinklers and drip systems for needed repairs and adjustments.
- Water early in the day to conserve water and minimize plant disease.
- Pinch back tips of chrysanthemums, fuchsias, marguerites.
- Tie up vines and stake tall growing dahlias, gladiolas, and lilies.
- For continued bloom, cut off spent flowers.
- Hang strips of foil or CD’s in fruit trees to help deter birds.
- First summer pruning for stone fruit.
- Thin grapes.
- Dig and divide crowded bulbs if the tops have died down.
- Give your indoor plants a bath.
- Place a 1” board under pots sitting on pavement to insulate them from radiated heat.
- Thoroughly clean debris from ponds, fountains and bird baths.
- Check dates of Master Gardener classes.
- Strawberries (end of May).
- Cane berries after harvest.
- Azaleas, camellias. rhododendron and acid loving plants.
- Roses at bloom start.
- Citrus. Monthly.
- Corn – N when knee high.
- If you did not use slow release fertilizer for summer bloomers. Give then a feeding now.
- Fertilize vegetables monthly.
- Feed indoor plants with slow release fertilizer.
- To control corn earworms, apply 20 drops of mineral oil to the silks 3-7 days after silks appear.
- Monitor stink bugs and tomatoes, squash, etc. Hand pick.
- Apples and pears for codling moth spray with Imidan, Malathion or Diazinon. First treatment when pears are ½” in diameter and apples are ?”. For timing use codling moth traps (available for sale at Cooperative Extension Office) or call Master Gardeners at (530) 621-5512.
- For codling moth control, attach 4” corrugated cardboard bands around tree trunks in early May; in late May or early June remove and destroy bands to kill the larvae and pupae found in the cardboard.
- Check for citrus scale and control with horticultural oil. Encourage natural enemies and protect trees from ants.
- If needed, apply Tanglefoot around tree trunks to deter ants and other crawling insects.
- Pears, except Comice – weak copper spray when in bloom, one to three applications for fireblight.
- Check roses for black spot, mildew and rust and spray if needed
- Check roses for aphids; control with a strong spray of water or insecticidal soap.
- Spray for Peach Leaf Curl http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7426.html
- Note: all the effective insecticidal sprays kill bees and other beneficial. Do not spray while trees are in bloom.
- Set mower blades high to reduce turf stress during the summer.
- Deep water lawns between midnight and 10 a.m.
What to Plant in June
- It is getting late, but…Beans, beets, corn, cucumber, melons, parsnip, peppers, pumpkins, radish, all squash, tomatoes.
- Gladiola corms every 2 weeks.
Plant Seed - Greenhouse or Cold Frame
- None this month.
Set out Plants
- Eggplant, peppers, tomatoes.
- Annuals: ageratum, bachelor buttons, celosia, cosmos, impatiens, lobelia, marigold, petunia.