200+Florida Broadleaf Mustard Green seeds Vegetable USA *Fast shipping. Cool season vegetables. Grow in clumps about 12-18 inches apart. Use straw mulch to hold in soil moisture. Start 4-6 weeks before the first frost for a fall harvest. For a spring harvest, start seeds 4 weeks ahead of the last frost. Days to Maturity: 30-45 Hardiness Zone: 3-8Temp Preference: Cooler Light Preference: Full Sun / Tolerant to some shade