August Gardening Guide: What to Plant, Grow & Enjoy in Southern California

August may be one of Southern California's hottest months, but it's also one of the most rewarding times to garden. With the right care, your landscape can stay colorful, productive, and healthy while you prepare for an incredible fall season.

Whether you're harvesting tomatoes, refreshing patio containers, planting colorful flowers, or simply trying to keep everything thriving through the heat, August is all about working smarter, not harder.

Keep Your Garden Looking Its Best Through the Summer Heat

August sunshine can be intense, but many plants absolutely thrive in the warmth. Rather than replacing tired gardens, refresh them with heat-loving varieties that continue blooming even during the hottest days.

Look for colorful favorites such as:

Lantana
Angelonia
Portulaca
Pentas
Lavender
Geraniums
Calibrachoa
Bacopa
Zinnias
Vinca

These dependable bloomers add weeks of vibrant color while attracting butterflies and other beneficial pollinators.

If containers are beginning to fade, swap in fresh annuals or colorful hanging baskets to instantly brighten patios, entryways, and outdoor living spaces.

Heat-loving flowers like lantana, vinca, pentas, and zinnias keep Southern California gardens colorful through August.

Refresh Your Summer Color

Brighten patios, entryways, and garden beds with heat-loving flowers that thrive through August.

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Water Smarter, Not More

One of the biggest mistakes gardeners make during August is watering too often.

Deep, infrequent watering encourages roots to grow deeper into the soil, helping plants become more drought tolerant.

Watering Tips

Water early in the morning whenever possible.
Water deeply instead of lightly every day.
Check soil moisture before watering.
Group plants with similar water needs together.
Repair leaking irrigation and adjust sprinkler timing for summer temperatures.

Moisture meters and watering globes can also help prevent both overwatering and underwatering.

Tip from Our Garden Experts

Before reaching for the hose, check the moisture below the surface. If the top inch of soil feels dry, dig down 3–4 inches first. Many established trees, shrubs, and perennials still have plenty of moisture where their roots are growing. Watering only when plants truly need it encourages deeper roots, improves drought tolerance, and helps conserve water throughout the hottest part of summer.

Refresh Garden Beds with Mulch

Fresh mulch is one of the easiest upgrades you can make in August.

A 2–3 inch layer helps:

Conserve moisture
Regulate soil temperature
Reduce weeds
Improve soil health
Create a finished landscape appearance

Redi-Gro bark products are excellent choices for landscape beds, trees, roses, and drought-tolerant gardens.

Mulch Now, Save Water Later

A fresh layer of mulch helps retain moisture, cool roots, reduce weeds, and give garden beds a finished look.

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Create a Pollinator Paradise

Late summer is one of the busiest seasons for bees, butterflies, and hummingbirds.

Adding nectar-rich flowers now helps support local pollinators while filling your garden with movement and color.

Great pollinator plants include:

Echinacea
Salvia 'Mystic Spires'
Lantana
Milkweed (Asclepias)
Polygala
Lavender

Adding a shallow water source or decorative fountain makes your garden even more inviting to beneficial wildlife.

Nectar-rich flowers help support bees, butterflies, and hummingbirds during late summer.

Bring Vacation Vibes Home

You don't need to travel to enjoy a tropical escape.

August is the perfect time to create your own backyard retreat with bold foliage, colorful flowers, and relaxing outdoor spaces.

Popular tropical plants include:

Hibiscus
Plumeria
Bougainvillea
Mandevilla

Pair them with decorative pottery, fountains, outdoor lighting, and comfortable patio furniture to create a space you'll enjoy long after summer ends.

Plant Waterwise for Long-Term Success

Southern California gardeners know every drop of water counts.

Waterwise plants deliver incredible beauty while using significantly less water once established.

Consider adding:

Dymondia
Creeping Thyme
Ruschia 'Carpet of Stars'
Succulents
Lavender
Olive Trees

These plants thrive in our Mediterranean climate while requiring less maintenance throughout the year.

Create a Waterwise Garden

Succulents, groundcovers, lavender, and other waterwise plants add beauty while helping reduce water use.

Houseplants for Back-to-School Season

As families settle back into school routines, August is a wonderful time to refresh indoor spaces.

Easy-care favorites include:

Golden Pothos
Dracaena
Dieffenbachia
Philodendron
Spider Plant

Pair your new houseplant with decorative pottery and quality potting soil for an instant home refresh.

Houseplants also make thoughtful teacher gifts, housewarming presents, and office décor.

Keep Harvesting Your Vegetable Garden

August is still harvest season.

Continue picking:

Tomatoes
Peppers
Squash
Cucumbers
Herbs

Regular harvesting encourages plants to keep producing.

This is also a great time to plant or refresh herbs like:

Basil
Rosemary
Sage
Thyme
Mint

Toward the end of the month, many gardeners also begin planting strawberries and early-season tomatoes for fall harvests.

Plant Trees While the Soil Is Warm

Warm summer soil encourages strong root growth, making August an excellent time to plant many trees.

Great choices include:

Olive Trees
Crape Myrtle
Camphor Trees
Chitalpa (Pink Dawn)

When planting trees:

Dig a properly sized planting hole.
Use a high-quality planting mix.
Apply a root starter fertilizer.
Finish with mulch to retain moisture.

Healthy roots established now will reward you with stronger growth throughout fall and next spring.

August is the perfect time to plan your fall landscape before Southern California’s best planting season begins.

Start Planning Your Fall Landscape

Believe it or not, fall planting season is just around the corner.

August is the ideal time to:

Redesign planting beds
Replace tired shrubs
Update irrigation
Install patios and pathways
Schedule landscape projects

Planning now allows you to be ready when cooler temperatures arrive—the best planting season in Southern California.

If you're dreaming about transforming your yard, now is the perfect time to schedule a landscape design consultation.

Dreaming of a Fall Landscape Refresh?

Start planning now so your project is ready when cooler fall planting weather arrives.

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August Garden Checklist

Refresh containers with heat-loving annuals.
Water deeply and early in the morning.
Add mulch to conserve moisture.
Feed container plants and hanging baskets.
Plant pollinator-friendly flowers.
Harvest tomatoes, peppers, and herbs regularly.
Refresh indoor spaces with houseplants.
Plant warm-season trees while soil is warm.
Inspect for pests and treat early.
Prepare your landscape for fall planting.

Frequently Asked Questions

Have a question? Here are answers to some of the most common questions about gardening in Southern California during August, including what to plant, how often to water, and how to keep your garden thriving through the summer heat.

What flowers grow best in August in Southern California?

Heat-loving flowers such as lantana, angelonia, pentas, lavender, geraniums, vinca, zinnias, portulaca, and calibrachoa continue blooming beautifully throughout August with regular watering and feeding.

Is August a good time to plant trees?

Yes. Warm soil encourages strong root growth, making August an excellent time to establish many shade, flowering, evergreen, and waterwise trees before cooler weather arrives.

How often should I water my garden in August?

Most established landscapes benefit from deep, infrequent watering rather than daily light watering. Water early in the morning and allow the soil to dry slightly between waterings to encourage deeper roots.

What vegetables can I harvest in August?

Tomatoes, peppers, cucumbers, squash, herbs, and many summer vegetables continue producing throughout August. Late in the month is also a great time to begin preparing for fall vegetables and strawberries.

How do I protect plants during extreme heat?

Apply mulch around plants, water deeply during the early morning, avoid heavy pruning during heat waves, and delay fertilizing plants that are showing signs of heat stress until temperatures moderate.

Why is August a good time to schedule landscape design?

Planning in August allows your project to begin as temperatures cool, giving new trees, shrubs, and perennials the best opportunity to establish during Southern California's ideal fall planting season.

August is all about helping your garden thrive through the heat while preparing for the seasons ahead. With smart watering, fresh mulch, heat-loving color, waterwise plants, and a little fall planning, your Southern California garden can stay beautiful, productive, and inspiring all month long.