Garden Notes August 2026

In Zones 8a and 8b, August is peak summer heat with long, hot days. Garden activity shifts from planting to maintaining heat-tolerant crops, preparing for fall planting, and protecting plants from heat stress. Watering, mulching, and pest vigilance are critical this month.

🌞 VEGETABLE GARDEN – AUGUST

🌱 Direct Sow (Late August – Fall Crops)

• Cool-season crops for fall harvest:

  • Lettuce

  • Spinach

  • Kale

  • Mustard greens

  • Arugula

  • Radishes

  • Carrots

  • Beets

  • Turnips

• Brassicas (late August for fall harvest in 8b):

  • Broccoli

  • Cabbage

  • Cauliflower

  • Collards

💡 Tip: Start seeds indoors in early August for transplant later in the month. Cool-season crops need partial shade and consistent moisture during germination.

🌿 Transplant

• Early August: transplant cool-season seedlings started indoors in late July.

• Herbs: basil, oregano, thyme, and parsley can continue to thrive with afternoon shade.

• Avoid transplanting heat-sensitive crops like tomatoes — only do this late in 8b regions for fall harvest.

🥬 Harvest & Maintenance

• Continue harvesting beans, cucumbers, squash, and peppers.

• Pick early tomatoes before fruit overripens.

• Remove spent cool-season crops to free space.

• Mulch heavily to reduce soil temperature and conserve moisture.

🍓 FRUIT CARE – AUGUST

• Harvest blackberries, blueberries, peaches, and plums as they ripen.

• Maintain consistent watering, especially in dry heat.

• Remove overripe fruit to reduce insect and rodent pressure.

• Light pruning only — focus on maintaining plant health for fall production.

🌸 FLOWERS – AUGUST

Heat-Tolerant Annuals

• Zinnias

• Cosmos

• Marigolds

• Sunflowers

• Gomphrena

Perennials Thriving in August Heat

• Echinacea purpurea

• Rudbeckia hirta

• Gaillardia pulchella

• Asclepias tuberosa

• Monarda didyma

Deadhead and remove spent blooms to prolong flowering.

🐝 POLLINATOR SUPPORT

• Maintain flowering herbs like basil, oregano, and thyme.

• Late-blooming perennials like coneflowers and blanket flowers provide summer nectar.

• Avoid insecticides during bloom.

✂️ PRUNING & SUMMER TASKS

Roses

• Deadhead spent blooms.

• Apply light fertilizer if desired.

Shrubs

• Light shaping only — avoid heavy pruning in extreme heat.

Tomatoes & Peppers

• Remove lower leaves to improve airflow.

• Continue pest scouting for hornworms, aphids, and spider mites.

🐛 PEST WATCH – AUGUST

Peak heat + occasional rains encourage pest activity:

• Tomato hornworms

• Squash vine borers

• Aphids

• Spider mites

• Stink bugs

Inspect crops frequently — early treatment is easier than recovery.

💧 WATER & MULCH

• Water deeply 2–3 times per week, adjust for soil type and rainfall.

• Maintain 3 inches of mulch to keep soil cool.

• Morning watering minimizes disease risk.

🌡️ WEATHER CONTINGENCIES

Extreme Heat (95–105°F+)

• Blossom drop is normal on heat-sensitive crops.

• Provide temporary shade for young or new transplants.

• Mulch heavily and monitor soil moisture.

Late Summer Storms

• Check drainage to prevent root rot.

• Inspect crops for fungal disease.

• Reapply mulch washed away by heavy rain.

🗓️ Late August Planning

• Start fall garden preparations: seed trays for broccoli, cabbage, kale, and lettuce.

• Plan succession plantings for September–October harvest.

• Begin scouting for fall pests early to prevent outbreaks.