What to plant in Pennsylvania in May
May in Pennsylvania marks a transition to warmer spring conditions, enabling a wide range of planting activities. With average temperatures rising and good rainfall, gardeners can focus on sowing both cool-season crops directly outdoors and starting warm-season varieties indoors for later transplanting. This month is crucial for establishing gardens before the onset of summer heat.
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Sowing
Recommended sowing
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Lettuce
Direct sow outdoors. Choose heat-tolerant varieties for later harvests.
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Radishes
Direct sow outdoors. Succession plant every 1-2 weeks for continuous harvest.
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Spinach
Direct sow outdoors. May bolt in extended warm periods; choose bolt-resistant varieties.
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Bush Beans
Direct sow outdoors once soil has warmed sufficiently (above 15°C).
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Carrots
Direct sow outdoors in well-drained, loose soil. Keep soil moist during germination.
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Beets
Direct sow outdoors. Thin seedlings to allow for root development.
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Swiss Chard
Direct sow outdoors. Tolerates a range of temperatures.
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Cucumber
Sow in protected seedbed / indoor tray. Transplant outdoors when risk of frost is past and soil is warm.
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Zucchini
Sow in protected seedbed / indoor tray. Transplant outdoors when risk of frost is past and soil is warm.
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Tomato
Sow in protected seedbed / indoor tray. Transplant outdoors after all danger of frost is gone and night temperatures are consistently above 10°C.
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Pepper
Sow in protected seedbed / indoor tray. Transplant outdoors after all danger of frost is gone and night temperatures are consistently above 10°C.
Seedlings
Seedlings
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Cabbage
Transplant pre-grown seedlings outdoors. Harden off plants before transplanting.
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Broccoli
Transplant pre-grown seedlings outdoors. Provide consistent water to prevent bolting.
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Cauliflower
Transplant pre-grown seedlings outdoors. Requires consistent moisture and nutrients.
Tasks
Monthly tasks
Monitor for late frosts, especially early in the month. Continue weeding regularly to reduce competition for nutrients and water. Begin mulching around established plants to conserve soil moisture as temperatures rise. Harden off warm-season seedlings started indoors in preparation for eventual transplanting in June.