Planting calendar
August Planting Guide for San Diego Gardens: Raised Beds, Containers & In-Ground
In August, San Diego gardeners can focus on planting heat-tolerant vegetables and herbs in raised beds, containers, and in-ground gardens. This is a great time to sow fall crops and start cool-season vegetables indoors to prepare for the milder months ahead.
Plant now (quick list)
Tomatoes (heat-tolerant varieties), Peppers, Eggplants, Basil, Okra, Sweet potatoes, Melons, Beans
Plant now
- Tomatoes (heat-tolerant varieties)
- Peppers
- Eggplants
- Basil
- Okra
- Sweet potatoes
- Melons
- Beans
- Swiss chard
- Malabar spinach
Start indoors
- Broccoli
- Cauliflower
- Cabbage
- Kale
- Lettuce
- Spinach
- Brussels sprouts
- Beets
- Carrots
- Radishes
Avoid
- Cool-season crops directly sown outdoors (due to heat stress)
- Newly planted leafy greens in full sun midday
- Frost-sensitive seedlings outdoors late in the month
- Overwatering heat-tolerant crops
- Planting root crops without adequate soil moisture
Next 2 weeks
- Harden off indoor seedlings by gradually exposing them to outdoor conditions
- Mulch raised beds and containers to retain moisture
- Monitor soil moisture closely and water deeply in the early morning
- Pinch back basil and herbs to encourage bushier growth
- Check for pests like aphids and caterpillars regularly
FAQs
Can I plant lettuce outdoors in August in San Diego?
It's best to start lettuce indoors or in shaded areas, as direct outdoor planting in August may cause bolting due to heat.
How often should I water container plants during August?
Water containers daily or when the top inch of soil feels dry, as containers dry out faster in warm weather.
Is it too late to plant tomatoes in August?
No, heat-tolerant tomato varieties can still be planted now for a late-season harvest.
Should I fertilize my raised bed garden in August?
Yes, apply a balanced fertilizer or compost to support continued growth during the warm season.
What pests should I watch for in August?
Common pests include aphids, whiteflies, and caterpillars; inspect plants regularly and use organic controls if needed.
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