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By Peyton Ellas
UCCE Master Gardner 

Master Gardeners' Tips for September and October


Last updated 9/8/2022 at 4:57pm | View PDF


Perhaps you have noticed the days are getting shorter? A sure sign that summer is winding down and fall is around the corner. I think of the garden year not from January to December, but from autumn to autumn, since so much of our garden creation and re-creation happens in the fall. The first half of September is preparation, and the second half is when the action really begins.


The vegetable garden transitions from warm to cool season, so there will be some of each in the beds this month. My tomatoes must stay in longer because they are setting better fruit now than they did in summer. But I'm cleaning out the rest of my old tired, buggy squash and melon plants and will let the beds rest a few weeks, before planting seedlings of broccoli, cabbage and cauliflower.

You can also plant seeds of carrot, lettuce, parsley, green onions, peas, radish, chard and other greens, turnips, seed potatoes and flowers like calendula, alyssum, snapdragon and poppies. You can also start planting trees and perennials or wait another month.

In our area, October is the best month for planting. As always, try to plant in the cool mornings and avoid planting if high temperatures are forecast. This is a great time to plant your ornamental perennials for next spring and summer. The warm fall days will give them time to get established, while winter will get their roots developed for a long, hot summer. Think of drought-tolerant plants such as salvias, butterfly bush, ceanothus, daylily, coreopsis or sunflower.


Pay attention to anything you plant this month. In the vegetable garden, aphids and white fly may still be active, and earwigs will be emerging from summer siesta. Continue with ant baits in edible and ornamental beds. Trees and perennials you plant will need to be monitored closely if the weather remains hot all month.

September is also cleanup month in the ornamental beds. Trim and prune shrubs, evergreen trees and flowers. Trim and divide bulbs, corms and tubers and replant by Thanksgiving. Dispose of any remaining fruit and nuts on trees or on the ground. Aerate cool season lawns. Keep plants free of dust to discourage spider mites. Apply ¼ cup each of Epsom salts and Ironite to each of your rose bushes around the base, and top off with compost.

You can apply pre-emergent herbicide for cool-season weeds starting this month or wait and hope for rain to water it in for you. Watch for blue grass, brome and other non-native weedy grasses to emerge and use a hoe or hand pull to reduce their numbers.

In addition to the roses, compost can be top-dressed in all beds, and go ahead and add mulch beginning this month. Check soil moisture with a monitor or your finger to adjust watering as the weather changes. Heat waves may occur, so be ready to pre-irrigate as needed to keep plants stress-free.


While you're trimming and slashing your way through the garden, keep an eye out for wildlife you want to conserve. Lizards, spiders, toads and moths are still active and all of them have a place in the well-managed garden. Keep the birdbaths full. Trim flowers off tropical non-native milkweeds, or better yet, replace with a species that is native to your area.

Consider replacing a few more high-water-use ornamental plants with those that thrive on less water. Consider creating a seasonal garden, including some plants that are dormant in summer.

Is that a new idea to you? Growing to understand and work with our particular climate is part of our role as gardeners of a true California garden. It's a lot easier than fighting against weather, lack of water and wildlife.

Have a great September!


The Tulare-Kings County Master Gardeners will be available to answer your questions:

Ace Hardware, Visalia - first Sat./every month, 10 a.m. to 1 p.m.

Luis Nursery, Visalia - second Sat./every month, 10 a.m. to 2 p.m.

Hanford Farmer's Market - fourth Thurs., Sept., 5-8 p.m., 7th St. and Irwin in downtown Hanford.

Visalia Farmer's Market - Saturdays, 8-11 a.m., 2100 W. Caldwell Ave. (behind Sears Building)

Or Call Us

Master Gardeners in Tulare County: (559) 684-3325, Tues. & Thurs., 9:30-11:30 a.m.

Visit our website to search past articles or find links to UC gardening information. To email us with your questions, send to:

Visit us on Facebook at:

Instagram at: @mgtularekings



The Master Gardeners will be available to answer your questions at a few select locations in the next few months!

Ace Hardware, Visalia - 1st Sat./every month, 10 am-1 pm

Luis Nursery, Visalia - 2nd Sat./every month, 10 am-2 pm

Hanford Farmer's Market - 4th Thurs, May - Sept., 5-8 pm, 7th ST. and Irwin Downtown Hanford

Questions? Call Us:

Master Gardeners in Tulare County: (559) 684-3325; Kings County at (559) 852-2736

Visit our website to search past articles, find links to UC gardening information, or to email us with your questions:

Visit us on Facebook at:

Follow us on Instagram at: @mgtularekings


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