Quarter Century Tomato

Start seeds indoors 6 to 8 weeks before your last spring frost. Sow seeds 1/4 inch deep in seed-starting mix kept at 70 to 75 degrees Fahrenheit, which typically yields germination in 5 to 10 days. Keep the soil moist but not waterlogged, and provide bright light once seedlings emerge.

Harden off seedlings over 7 to 10 days by gradually exposing them to outdoor conditions, then transplant outdoors after the last frost date when soil temperature reaches at least 60 degrees Fahrenheit. Space plants 24 inches apart with rows 36 inches apart, burying the stem up to the first true leaves to encourage a stronger root system.

Harvest when fruits reach full red color and yield slightly to gentle pressure, typically 80 to 85 days after transplanting. Quarter Century produces its fruit in a concentrated window rather than over an extended season, so watch for rapid ripening once the first fruits mature. Pick fruits by gently twisting and pulling, or use pruners to avoid damaging the plant.

Determinate varieties like Quarter Century require minimal pruning. Remove only the lowest leaves once fruiting begins to improve air circulation and reduce disease risk, but avoid heavy pruning that would remove too much foliage and expose fruit to sunscald.