Seeds should germinate in seven to 10 days. Stock seedlings grow best in cool room temperatures of about 70 degrees Fahrenheit. The seedlings grow rapidly and are ready to transplant outdoors about six weeks after germination. Stocks will grow best in sunny or part shaded areas in moist yet well-drained soil. They should be planted around 15-20cm apart but will tolerate a little crowding. They arguably look best when planted in larger clumps of mixed varieties. When planting be sure to water well and keep the soil moist but not waterlogged.