Planting calendar
August Planting Guide for San Diego Gardens: Raised Beds, Containers & In-Ground
In August, San Diego gardeners can successfully plant heat-tolerant vegetables and herbs in raised beds, containers, and in-ground gardens. Focus on crops that thrive in late summer warmth and prepare for fall harvests by sowing seeds and transplanting seedlings.
Plant now (quick list)
Tomatoes (transplants), Peppers, Eggplants, Basil, Swiss chard, Green beans, Okra, Malabar spinach
Plant now
- Tomatoes (transplants)
- Peppers
- Eggplants
- Basil
- Swiss chard
- Green beans
- Okra
- Malabar spinach
Start indoors
- Broccoli
- Cauliflower
- Cabbage
- Kale
- Brussels sprouts
- Lettuce
- Spinach
- Beets
Avoid
- Cool-season crops like peas
- Root crops sensitive to heat (carrots, parsnips)
- Leafy greens that bolt quickly in heat (arugula, cilantro)
- Potatoes
- Corn
Next 2 weeks
- Monitor soil moisture carefully; increase watering as needed
- Mulch to retain moisture and reduce soil temperature
- Watch for pests like aphids and whiteflies
- Thin seedlings to prevent overcrowding
- Fertilize heat-loving plants with balanced fertilizer
- Provide shade during extreme heat spikes
- Check container drainage regularly
FAQs
Can I plant cool-season vegetables in August in San Diego?
August is best for starting cool-season crops indoors or in shaded areas, as outdoor temperatures remain high and can stress these plants.
How often should I water raised beds and containers in August?
Water daily or every other day depending on heat and soil moisture; containers dry out faster and may need more frequent watering.
Is it necessary to mulch my garden in August?
Yes, mulching helps retain soil moisture, regulate temperature, and reduce weed growth during hot summer conditions.
What are common pests to watch for in August?
Aphids, whiteflies, and spider mites are common in late summer; inspect plants regularly and use appropriate controls if needed.
Can I still plant tomatoes in August?
Yes, transplanting tomato seedlings in August is possible, especially heat-tolerant varieties, to extend the growing season into fall.
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