What to Plant in Phoenix in May
May is the final chapter of the Phoenix spring garden. Temperatures are rising toward 100°F, and your spring crops are winding down one by one. The good news: harvests are still heavy in early May. The reality: you need to pull crops before the heat destroys them, and start preparing for a long, hot summer.
What's Still Producing in May
- Tomatoes (early May) — Continue to produce until daytime temps hit 95°F consistently. Watch for blossom drop as a sign the productive window is closing. Harvest everything as it ripens.
- Peppers — More heat-tolerant than tomatoes. Continue producing into June and some varieties produce all summer.
- Eggplant — One of the best summer survivors in Phoenix. Will continue producing all summer with adequate water and mulch.
- Cucumbers and squash — Finishing up. Productivity drops sharply as heat rises. Pull plants when production stops.
When to Pull Spring Crops
The signal for tomatoes is clear: when daytime temperatures consistently exceed 95°F, flowers drop and no new fruit sets. Harvest whatever's on the plant and pull it.
For cucumbers and squash: when plants stop producing and look stressed (yellow leaves, sparse foliage), pull them. They're done for the season.
Leave peppers, eggplant, and established basil — these can survive summer with good care.
What to Plant in May
Okra
If you haven't started okra yet, May is still fine. Okra genuinely loves Phoenix summer heat — unlike most crops, it produces more as temperatures rise. Direct sow or transplant in May. Expect first harvest in July and production through September.
Sweet Potato Slips
Plant sweet potato slips in May — they need 90–120 days to form tubers and won't be ready until September or October. The vines spread as a ground cover through summer heat and the tops are edible greens.
Armenian Cucumber
This heat-tolerant melon-cucumber hybrid can still go in May for June–August production. Water heavily and mulch well.
Transitioning to Summer
As you pull spring crops, mulch empty beds with 3–4 inches of wood chips or straw. This protects soil from the brutal sun, keeps soil temperatures from spiking, and preserves moisture. Don't let bare soil bake in Phoenix summer — it degrades soil structure and bakes beneficial microbes.
Keep your drip system running on any remaining plants. Adjust timers to daily watering as temperatures climb past 100°F.
Frequently Asked Questions
What can I plant in Phoenix in May?
Okra, Armenian cucumber, sweet potato slips, amaranth, and tepary beans. Most spring crops are finishing. May is primarily the last harvest period and the start of summer preparation.
When should I pull my Phoenix tomato plants?
When daytime temperatures consistently hit 95°F (typically late May) and fruit set stops. Let fruit already on the plant ripen first, then pull. Once temperatures are consistently above 95°F, the productive season is over.
Can I keep gardening in Phoenix through the summer?
A small selection of heat-adapted crops grows through Phoenix summer: okra, Armenian cucumber, sweet potato vines, amaranth, and tepary beans. For most vegetables, June through September is too hot. Most experienced Phoenix gardeners rest their beds those months.
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