Wisconsin Chief is a semi-determinate heirloom tomato developed by the University of Wisconsin and released in 1957. Originally bred for processing, this variety produces medium-large red beefsteak fruits (7-10 oz) with excellent flavor and has won top honors in taste competitions. Germination requires warm soil temperatures (70-85°F optimal) and consistent moisture, typically occurring within 5-14 days under proper conditions.
Before sowing
No pre-treatment needed — sow directly.
Sowing
What to expect
Tips
Use a heating mat to maintain soil temperature at 75-85°F for faster and more uniform germination. Keep seeds covered with a humidity dome until germination to prevent drying out. Tomato seeds do not require light to germinate but need warmth and consistent moisture. Once seedlings emerge, immediately remove the dome and provide bright light (14+ hours daily using fluorescent or grow lights) to prevent leggy growth. Water carefully from below to avoid fungal diseases. Sow seeds indoors 6-8 weeks before the last frost date. Pot up seedlings to 3-4 inch pots when first true leaves develop (not cotyledon leaves). Harden off plants for 1-2 weeks before transplanting outdoors after the last frost date. Transplant spacing should be 24-36 inches apart. Provide stakes, cages, or trellising for support.
Sources: University of Wisconsin Extension, Johnny's Seeds, Seed Savers Exchange, Tim's Tomatoes, Firefly Farms & Mercantile
