Planting calendar
August Planting Guide for Washington, DC: Raised Beds, Containers, and In-Ground Gardens
In August, Washington, DC gardeners can 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 planning for fall by planting now and starting some seeds indoors for transplant later.
Plant now (quick list)
lettuce, spinach, radishes, beets, kale, carrots, collard greens, turnips
Plant now
- lettuce
- spinach
- radishes
- beets
- kale
- carrots
- collard greens
- turnips
- bush beans
- herbs like cilantro and parsley
Start indoors
- broccoli
- cauliflower
- cabbage
- Brussels sprouts
- kohlrabi
- lettuce (for transplanting)
- celery
- leeks
- onions (from seed)
- chard
Avoid
- warm-season crops like tomatoes
- peppers
- eggplants
- corn
- cucumbers
- melons
- pumpkins
- summer squash
- beans (after mid-August)
- potatoes
Next 2 weeks
- direct sow radishes and spinach for quick harvest
- transplant started broccoli and cabbage seedlings outdoors
- mulch raised beds to retain moisture
- water containers regularly as temperatures remain warm
- monitor for pests like aphids on leafy greens
- thin seedlings to prevent overcrowding
- start planning cover crops for soil health
- harvest mature summer crops to free space
- fertilize leafy greens lightly for continued growth
- shade delicate seedlings during hottest part of day
FAQs
Can I plant tomatoes in August in Washington, DC?
It's best to avoid planting tomatoes in August as the growing season is winding down and they may not mature before cooler weather arrives.
How often should I water container plants in August?
Water container plants daily or when the top inch of soil feels dry, as containers dry out faster in warm weather.
What vegetables can I start indoors in August for fall transplant?
Start broccoli, cauliflower, cabbage, Brussels sprouts, and kohlrabi indoors now to transplant outdoors in early fall.
Is it too late to plant lettuce in August?
No, August is a great time to plant lettuce for a fall harvest since it prefers cooler temperatures.
Should I be concerned about frost in late August?
Frost is unlikely in late August, but be prepared to protect tender plants as temperatures cool in September and October.
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