OP, 60 days. This perennial cress is rich in vitamins with a distinctive flavour for salads and vegetarian dishes. Small, dark green leaves grow on crisp stems. The peppery flavour of watercress is at its peak in the cooler season, fading after the plant flowers. growing green blends Timing: Direct sow short rows every 3 weeks, from early spring to late summer, for a continuous harvest. Starting: Cover lightly with soil, and firm them in. Overseeding is one of the major causes of disappointment in growing a greens blend. Try to space seeds about 1cm (0.4) apart. Growing: Amend with a bit of balanced organic fertilizer if needed. Water regularly. Harvest: Cut greens regularly when they reach your desired size. Provide frost protection and many greens blends will grow all winter. Seed Specs: Usual seed life: 3 years. Minimum germination: 80%. Direct seeded per 100' row: 6M seeds, per acre: 5,000M seeds. Avg. 500 seeds/gram.