Monthly Gardening Tips

June 2021


  • Water lawns and gardens three times a week depending on temperatures, wind and rainfall.
  • Water established trees slowly and deeply once a week.
  • Water shrubs three times a week.
  • Water annuals and perennials in containers three times a week depending on pot size and temperatures. (New plantings will require more water the first year.)
  • Adjust timers on your automatic sprinkler systems.
  • Water more frequently as the outdoor temperature increases. Watering in the morning is recommended.


  • DO NOT fertilize if temperatures are over 85 degrees.
  • Apply a good fertilizer on established trees, shrubs and ornamental grasses if you have not done so in the previous month.
  • Fertilize cool-season lawns such as bluegrass or park blend.
  • Fertilize warm-season lawns such as buffalo, bermuda and gramma.
  • Continue to fertilize houseplants with a good water-soluble fertilizer. Be sure not to over-fertilize or over-water houseplants and never fertilize a sick plant.
  • Continue to fertilize established roses with a good rose food.
  • Fertilize annual container gardens with a high phosphorus blooming formula weekly for continued blooming throughout the summer.
  • Fertilize vegetables with a good organic vegetable food.

Yard And Garden

  • Plant flowering annuals and perennials in your gardens for wonderful flowering all summer.
  • Plant or refresh your containers with annuals, perennials and/or small shrubs. Remember the saying, “ThrillerFillerSpiller!”
  • Plant native trees, shrubs and perennials for beautiful low-water xeric landscape.
  • Prune spring-flowering shrubs shortly after blooming in late spring/early summer.
  • Mow established lawns weekly.
  • Use a good weed killer to fight weeds.
  • Apply a pre-emergent to established lawns and ornamental flower beds to prevent weed seed germination.
  • Continue to remove spent flower blossoms from roses and flowering plants to promote repeat flowering.
  • Refresh mulches as needed to conserve moisture.
  • Take houseplants outside and put them in a shady, protected area. It’s a great time to rinse the accumulated dust off leaves, leach out soil with water and fertilize.
  • Annual flowers such as sunflowers, cosmos, zinnias and morning glories can be directly seeded in your garden. You can also seed with perennial wildflower mixes.
  • Continue seeding warm-season lawns.

Insects And Diseases

  • Keep an eye out for aphids, spider mites and other insects. Eliminate as needed.
  • Use BT to prevent damage on your plants from budworms (geraniums and petunias) and tomato horn worm on tomato plants.
  • Add calcium to prevent blossom end rot. (Most good tomato fertilizers with have calcium in them.)
  • Check roses and other foliage for powdery mildew.
  • Spray fruit trees with a good fruit tree spray to prevent insects and diseases. Fruit trees are developing fruit so keep your trees hydrated and fertilize according to the label.
  • Bring in samples of insects or damaged plants to our pharmacy in plastic baggies for solutions to the problem areas. We can also identify plants for you.
  • Inspect roses and other foliage for powdery mildew and other diseases and treat as necessary.
  • Apply chelated iron or soil acidifier with iron to chlorosis-prone trees and shrubs, chitalpa, maples, aspens, willows, euonymus and photinia and other non-native trees and shrubs.
  • Kill weeds with a good weed killer.


  • June is the last month to plant warm-season vegetables such as tomatoes, green chili, bell peppers, eggplant, beans, cucumbers, squash and melons.
  • Plant herbs such as basil, rosemary and tarragon.
  • Continue to plant vegetables in successive planting so that you have continuous harvesting throughout the growing season.