Monthly Gardening Tips

September 2020


  • Gradually cut back on watering as temperatures go down.
  • Water lawns and gardens 2 times a week.
  • Water established trees, slowly and deeply, once a week.
  • Water fruit trees 2 times a week.
  • Water shrubs 2 times a week.
  • Water annuals and perennials in containers 2 times a week depending on pot size and temperature.
  • New plantings will require more water the first year.
  • Inspect and repair drip irrigation as necessary and reset timers to twice a week.


  • Fertilize annual container gardens with a high phosphorus blooming-formula weekly for continued blooms throughout fall and winter.
  • Fertilize cool-season vegetables with a good organic vegetable food.
  • Fertilize roses for the last time this season.
  • Fertilize trees and shrubs for the last time this season.
  • Fertilize lawns with a low-nitrogen fertilizer for the last time this season.

 Yard & Garden

  • Replace summer-flowering annuals with cool-season plants such as pansies, mums, ornamental kale and snapdragons.
  • Plant perennials so they will acclimate over winter for better summer-blooming. Put super-phosphate in the holes when planting for even better blooming!
  • Plant up or refresh your containers with cool-season annuals and/or small shrubs. Remember the saying, “Thriller, Filler, Spiller!”
  • Plant native trees, shrubs and perennials for beautiful low-water xeric landscape.
  • Fall is a great time to plant trees and shrubs because they will establish better over winter.
  • Mow established lawns as needed.
  • Continue to remove spent blooms from roses and plants to encourage repeat flowering.
  • Refresh mulch as needed to conserve moisture and suppress weeds.
  • Sod a new lawn area.
  • Remove thatch from established lawns and reseed thin areas.
  • Broadcast some wildflower seeds in a naturalized area.
  • Plant spring-flowering bulbs such as tulips, daffodils and hyacinth. Use Dutch Bulb food when planting.
  • Bring in houseplants that have summered outside before the last frost. Inspect them well for insects and damage. Treat as needed.
  • Prune summer-flowering shrubs such as crape myrtle, butterfly bush and rose of sharon.
  • Decorate for fall with chili ristras, pumpkins and mums!

Insects & Diseases

  • Keep an eye out for aphids, spider mites and other insects. Eliminate as needed.
  • Use BT to prevent damage to your plants from budworms (on geraniums and petunias blossoms) and tomato horn worm (on tomato plants).
  • 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 disease. Treat as needed.
  • Continue to kill weeds with a good weed killer. Do not let them go to seed to prevent future generations of weeds.


  • Continue to harvest vegetables and fruit as they ripen.
  • Clean up vegetable gardens by removing plants that are no longer producing.
  • Plant cool-season vegetables such as broccoli, Brussels sprouts, cabbage, carrots, lettuce and spinach.
  • Plant cool-season vegetables from seed, such as carrots, lettuce and spinach.