Planting calendar
August Planting Guide for Washington, DC: Raised Beds, Containers, and In-Ground Gardens
In August in Washington, DC, focus on planting cool-season crops and preparing for fall harvests in raised beds, containers, and in-ground gardens. This is an ideal time to sow leafy greens, root vegetables, and herbs that thrive as temperatures gradually cool. Start seeds indoors for some fall and winter crops to extend your growing season.
Plant now (quick list)
Lettuce, Spinach, Radishes, Kale, Carrots, Beets, Swiss chard, Bush beans
Plant now
- Lettuce
- Spinach
- Radishes
- Kale
- Carrots
- Beets
- Swiss chard
- Bush beans
- Turnips
Start indoors
- Broccoli
- Cauliflower
- Cabbage
- Brussels sprouts
- Kohlrabi
- Collard greens
- Herbs like parsley and cilantro
Avoid
- Tomatoes (avoid new plantings due to heat stress)
- Peppers (slow to mature in late season)
- Corn (too late for a full crop)
- Melons (heat stress and late season)
- Squash (susceptible to pests late season)
Next 2 weeks
- Keep soil consistently moist for seed germination
- Mulch to retain moisture and regulate soil temperature
- Watch for pests like aphids and squash bugs
- Thin seedlings to avoid overcrowding
- Fertilize leafy greens with nitrogen-rich fertilizer
FAQs
Can I plant tomatoes in August in Washington, DC?
It's not recommended to plant new tomatoes in August due to the heat and limited time for fruit to mature before frost.
How do I protect my late summer crops from heat?
Use shade cloth during the hottest part of the day and mulch to keep soil cool and moist.
When should I start broccoli indoors for fall planting?
Start broccoli seeds indoors in mid to late August to transplant outdoors in early fall.
Are raised beds better for fall crops in DC?
Yes, raised beds warm up faster and drain well, which benefits fall crops planted in late summer.
What herbs can I plant now for fall harvest?
Parsley, cilantro, and chives are good herbs to plant in August for fall harvesting.
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