Planting calendar
August Planting Guide for Phoenix, AZ: Raised Beds, Containers & In-Ground Gardens
In August in Phoenix, AZ, focus on planting heat-tolerant fall crops in raised beds, containers, and in-ground gardens. This is the ideal time to sow seeds for cool-season vegetables and start planning for a productive fall harvest while avoiding extreme summer heat stress.
Plant now (quick list)
Lettuce, Spinach, Kale, Radishes, Carrots, Beets, Broccoli, Cauliflower
Plant now
- Lettuce
- Spinach
- Kale
- Radishes
- Carrots
- Beets
- Broccoli
- Cauliflower
- Swiss chard
- Turnips
Start indoors
- Cabbage
- Brussels sprouts
- Celery
- Leeks
- Onions
- Tomatoes (for fall transplant)
- Peppers (for fall transplant)
- Eggplants (for fall transplant)
Avoid
- Beans
- Corn
- Squash
- Melons
- Cucumbers
- Okra
- Sweet potatoes
- Eggplants (direct sow)
- Tomatoes (direct sow)
Next 2 weeks
- Monitor soil moisture closely and water early mornings
- Mulch raised beds and containers to retain moisture
- Prepare soil by adding compost for fall crops
- Thin seedlings to prevent overcrowding
- Watch for pests like aphids and treat promptly
- Provide shade during extreme heat spikes
- Fertilize leafy greens lightly every 2-3 weeks
- Start hardening off indoor seedlings before transplanting
FAQs
Can I plant tomatoes directly in August in Phoenix?
It's best to start tomatoes indoors in August and transplant them in early fall to avoid the intense summer heat.
How often should I water raised beds in August?
Water raised beds early in the morning 2-3 times per week, adjusting for soil moisture and temperature.
Are there any vegetables to avoid planting in August here?
Avoid heat-sensitive crops like beans, corn, and squash as they won't thrive in the late summer heat.
Can I grow leafy greens in containers during August?
Yes, leafy greens like spinach and lettuce do well in containers if kept shaded during peak heat.
When should I transplant seedlings started indoors?
Transplant seedlings outdoors in late August to early September when temperatures start to moderate.
Next steps
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