03/04/2026
March opens the window for warm-season crops and fast growers that don't need as long indoors. These seeds thrive with a shorter indoor runway — 2 to 8 weeks from sow to transplant-ready under good light and warmth.
LONG LEAD TIME — start now
→ Ground Cherry — start 6 to 8 weeks before last frost. Slow starter related to tomatoes. Sweet husked fruit worth the wait.
→ Sweet Potato — start slips from tubers now. Needs warm water or soil method and 6 to 8 weeks to produce transplants.
→ Okra — start 4 to 6 weeks before last frost. Will not germinate below 65°F soil temperature.
→ Amaranth — start 4 to 6 weeks indoors. Dual-purpose grain and green crop that thrives in summer heat.
MEDIUM LEAD TIME
→ Zucchini — start 3 to 4 weeks before last frost. Fast grower that outpaces its pot quickly so timing matters.
→ Cucumber — start 3 to 4 weeks indoors maximum. Sensitive to root disturbance so sow in peat pots or soil blocks.
→ Watermelon — start 3 to 4 weeks before transplant. Needs 80°F or warmer soil and full light from day one.
→ Cantaloupe — start 3 to 4 weeks indoors. Another heat-lover that resents cold soil and transplant shock.
→ Nasturtiums — start 2 to 4 weeks before last frost. Edible flower that prefers lean soil and direct light.
SHORTEST LEAD TIME — wait a bit longer
→ Pumpkin — start 2 to 3 weeks before last frost at most. Vigorous grower that needs large pots to avoid root binding.
→ Sweet Corn — start in deep cells 2 to 3 weeks early for a head start. Direct sowing works fine in warmer zones.
→ Sunflowers — start 2 to 3 weeks indoors for earlier blooms. Deep taproot develops fast so transplant early before it outgrows the pot.
The fast growers punish you for starting too early — rootbound pots and leggy stems. The slow starters punish you for waiting. Match the lead time and everything arrives at transplant ready.
