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UC Master Gardeners of Riverside County
August 2026
Events & Information eBlast
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Growing Food for Health Workshop | |
Date: Saturday, August 1
Location: 4500 Glenwood Dr., Riverside CA. 92506
Time: 10:00am
| The Riverside Home & Backyard Show | |
Date: August 1 & 2
Location: Riverside Convention Center, 3637 5th Street, Riverside CA. 92501
Time: 10:00am
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Date: Saturday, August 29
Location: 4500 Glenwood Dr., Riverside, CA. 92501
Time: 10:00am
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JOIN US AT AUGUST
CERTIFIED FARMERS MARKETS
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FARMERS MARKETS FEATURING
UC MASTER GARDENERS
These fun events combine shopping for fresh fruits and vegetables, gourmet foods, flowers, crafts, and many other interesting items with an "Ask the Master Gardener" information table. Master Gardeners are present to answer your gardening questions, hand out a wide range of materials on gardening topics, and present "how to do it" gardening demonstrations. This is where you can find us at farmers markets in August:
PALM SPRINGS--Saturdays, August 8 & 22, from 8:00 am-12:30 pm at 2300 E. Baristo Road
DOWNTOWN RIVERSIDE--Saturday, August 8, from 8:00 am-2:00 pm at Main Street, between 5th and 6th
TEMECULA--Promenade Mall--Wednesdays, August 12 & 26, from 9:00am - 1:00pm, 40820 Winchester Road (Upper Level of Mall, in front of Dick's Sporting Goods)
MURRIETA--Sunday, August 9 & 23, from 9:00am - 1:00pm, Village Walk Plaza, 24480 Village Walk Place
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Maintenance
- Continue mulching to conserve soil moisture and control weeds.
- Keep harvesting vegetables for continued production.
- Do the final pruning of summer for fruit bushes.
- Prune apricots to avoid Eutypa fungus. Remove about 20% of this year's growth.
- To prevent the spread of brown rot, clean up debris around fruit trees and pick up dropped fruit.
- Control salt build-up on indoor plants; hose off the leaves and flush the soil with ample water.
- Attach bands of corrugated cardboard around apple tree trunks to trap coddling moth larvae.
Deciduous Fruit Trees
- Monitor the soil moisture and irrigate as needed. Flooding the soil beneath these trees or using a drip system are both excellent ways to irrigate these. Avoid the use of sprinklers and do not regularly wet the trunk of the tree to reduce the potential of certain diseases.
- Limit the size of fruit trees: the correct time to prune them is immediately following the fruit harvest, which may be now. Pruning in winter is important for the purpose of fruit production and tree structure. However, winter pruning will not limit the size of a tree; summer pruning will.
Fertilize
- Camellias, azaleas, and gardenias with chelated iron if there is yellowing between the leaf veins.
- Indoor plants
- Strawberries
- Mature fruit trees (after picking fruit) with Nitrogen and water
- Roses, six weeks after last application
- Last feeding of the year for citrus and avocados
- Chrysanthemums (until the buds start to open)
- Other plants like begonias, fuchsias, annuals and container plants
Flowers
- Seed winter annuals this month.
- Sow seeds of perennials in flats or pots for transplanting in October.
- Try thrift, yarrow, coneflower and salvia.
Vegetables
- In a cool location indoors, start seeds of cabbage, broccoli, cauliflower, kale, bunching onion, and radicchio for over-wintering.
- Direct seed oriental greens, beets, carrots, lettuce, turnips, Florence fennel, mustard, radish, rutabaga, spinach, and leeks.
Herbs
- You can still get a decent harvest of basil if you get it planted right away. Keep pinching the flowers off as they develop. Flowers not only reduce the quantity and size of the foliage, but change the flavor of basil as well.
- Many perennial herbs can be planted nearly year-round, even during the heat of August if they are watered carefully. These include marjoram, oregano, rosemary, sage, thyme, feverfew, lavender, lemon balm, lemon grass, lemon verbena, St. John's wort, tansy, tarragon and thyme.
Spray
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All fruit and nut trees: Check IPM for safe and effective sprays
- Walnuts for husk fly
- Pears and apples: check instructions to be sure pre-harvest intervals are strictly observed
- Note: All the effective insecticidal sprays kill bees and other beneficial insects. Do not spray while trees are in bloom.
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Have a Gardening Question?
Ask a UC Master Gardener!
Include as much detail as possible and any photos that illustrate your problem/question.
Email:
Riverside County: anrmgriverside@ucanr.edu
You may also call the "Ask Your Master Gardener" Helpline at 951-955-2647 with your questions.
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Sign up to receive our monthly Riverside County Events eBlast, full of gardening tips and upcoming event information delivered straight to your inbox.
rivctyucmgp@gmail.com
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Copyright © 2026, UC Master Gardener Program of Riverside County, All rights reserved.
CONTACT US:
UC Master Gardener Program of Riverside County
2080 Washington Street
Riverside 92504
951-955-0170 (Main)
anrmgriverside@ucanr.edu
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