September Garden Tips

gillnurseryMonthly Garden GuideLeave a Comment

What to


September is vegetable seed month.

There are numerous selections of vegetables to be started in the garden or in containers. Come in and pick up our fall vegetable guide.

Read: Why Botanical Interests is Our Favorite Seed Company

Tomatoes & Peppers

Tomatoes and peppers can be planted through the middle of the month.

Planting Guide: Our Tomato Varieties
Read: New! Grape Tomato ‘Ruby Crush’


A large selection of herbs will be ready to add spice to your garden.

Garden Guide: Herbs

Bluebonnets & Other Wildflowers, Nasturtiums & Fall Marigolds

Plant by seed or transplants.

Read: Fall is Wildflower Time!, Benefits of Marigolds in Your Veggie Garden, Nasturtiums – Super Pretty & Easy (Yummy Too!)

Don’t plant pansies or snapdragons until temperatures have cooled down!

All container grown trees, shrubs and vines.

There is still time to add quick summer color such as zinnias, coleus, purslane, moss rose and periwinkles.

Read: Impatiens Update for Fall!

What to


Continue removing faded flowers from annuals and perennials to encourage new blooms.

Faded blooms and seedpods from crape myrtles to promote additional blooming.

Read: Sharp Tools for Fall Pruning!

Lawn Care

  • Apply Bayer Lawn Fungus Control granules or F-Stop granules as a preventative to brown patch fungus, which shows up as temperatures drop during fall and winter months. Organic: Serenade or Nature’s Blend for lawns.

    Watch: Brown Patch Fungus

  • Apply Ironite or Hi Yield Iron Plus to yellowing lawns, organically with Green Sand.
  • Apply Nature’s Blend or Peat Moss to lawns prone to Take All Patch Fungus.
  • Continue to water deeply every 1 to 2 weeks if little rainfall.

    Wait to apply fall fertilizer until October!

What to


  • Check all newly planted material for water every day.
  • Check pots, containers and hanging baskets often as they dry out quickly and need more water.
  • Apply mulch as needed to help conserve moisture.
  • Make arrangements for someone to water if leaving for more than 2 days, especially with new plants.
    Follow City Guidelines.

What to


Out For

  • Masses of worms eating your oak tree.

    Treat with Liquid Sevin
    Organic: Spinosad or Thuricide.

    Read: Oak Tree Caterpillars

  • Mealy Bugs

    Treat with Cyonara, or Spectracide Triazicide, or Bonide Systemic Liquid or Granule
    Organic: Neem Oil or Insecticidal Soap

    Read: Mealy Bugs are Here!

  • White Flies on tropicals and perennials, especially lantana and hibiscus.

    Treat with Bayer Rose & Flower Spray, or Bayer Tree & Shrub Concentrate
    Organic: Insecticidal Soap or Neem Oil.

    Watch: Yucky Whitefly

  • Caterpillars or their damage (chewed leaves).

    Spray organically with Spinosad or Thuricide.

    Read: Not All Caterpillars are Bad!

  • Fleas and Ticks

    Treat lawns with Cyonara or Triazicide
    Organic: Spinosad, or Diatomaceous Earth Crawling Insect Killer.

  • Mosquitoes

    Use Mosquito Beater Liquid for quick kill or Mosquito Beater Granules to repel.

    Read: Mosquito Solutions

Note: Please, Please, Please, don’t kill the bees!

They are one of the best sources we have to pollinate our fruits, vegetables, flowers, and shrubs.




Spray only growing weeds with Round Up or Horticultural Vinegar. These products kill all vegetation; so protect plants from drift or over spray.

Apply Hi Yield Weed Control with Dimension in the fall and spring to prevent seeds from sprouting. It will not control already growing weeds.
Organic: Corn Gluten meal.

What to



We recommend: Hibiscus Food
Organic: Maestro Rose Glo


We recommend: Hi Yield Ammonium Sulphate, or Osmocote 14-14-14 Time Release Granules
Organic: Hasta Gro, Maestro Rose Glo or Plant Tone


We recommend: Bayer Rose & Flower Rose Food
Organic: Maestro Rose Glo


We recommend: Miracle Gro
Organic: with Maestro Rose Glo

Blooming Annuals and Perennials

We recommend: Hibiscus Food, or Osmocote 14-14-14 Time Release
Organic: Medina Growin Green, Hasta Gro or Maestro Rose Glo

All plants that are especially stressed, or recently transplanted

We recommend/Organic: Hasta Gro Organic Fertilizer or Super Thrive

Christmas Cactus

We recommend: Miracle Gro or
Organic: Hasta Gro

Read: How to Get Your Christmas Cactus to Bloom!


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