06/01/2026
Welcome June!
What to plant in June:
Annuals - Direct seed Celosia, Cosmos, Marigold, Sunflower, Zinnia.
Perennials - Cornflower, Coreopsis, Dahlia, Daylily, Rudbeckis, Verbena, Yarrow.
Vegetables - Direct seed corn, summer squash. At higher elevations, plant bean seeds. Direct seed annual herbs.
-Don’t fertilize plants or trees during extreme hot weather. Fertilizers increase the plant’s growth and needs for water and nutrients. This adds to the stress of the plant.
-During the hot summer months, water your trees deeply and infrequently. This will encourage deeply rooted trees that are healthier and less prone to disease.
-Tie up vines; stake tall plants such as lilies, dahlias, and gladioli.
-If growing cherries, peaches, nectarines, plums, or pluots, now is the time for the first summer pruning.
-In hot weather, check soil moisture to be sure you are irrigating sufficiently.
-A moisture meter will help determine water needs for hanging and potted plants.
-In really hot weather, plan to only be in the garden early morning or late evening.
-Dig and divide crowded bulbs when 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.
-Heighten mower blades to reduce turf stress during the summer. Deep water lawns between midnight and 9 a.m.
-Monitor stink bugs on tomatoes, squash, etc.; hand pick or spray with insecticidal soap if needed.
-Deadhead roses for continuous blooms. Deep water and fertilize as needed.
-Thin grape clusters to promote larger grapes and better-quality fruit.
-To control corn earworms, apply 20 drops of mineral oil to the silks 3-7 days after the silks appear.
-Check compost pile for readiness and keep covered and moist if not ready.
-Feed camellias, azaleas, and other acid-loving plants with acid fertilizers.
-Deep-watering lawns, trees, and shrubs promotes healthier, deeper, more heat-tolerant roots. Depending on soil type or slope conditions, a watering schedule that cycles on and off several times a day may be needed to accomplish deep watering.
-Cut back Shasta daisies after flowering to promote a second bloom in the fall.
-Continue mulching around plants to control weeds and conserve moisture.