Seeds germinate most readily in wet medium. A shallow tray filled with a moist, sterile seed-starting medium allows you to start several seeds in a single container. Sow the seeds on the surface of the medium, pressing them in lightly so they are in full contact with the medium, and space seeds about 2 inches apart. Cover the seeds with a thin layer of sand or the potting medium so they are just covered. After sowing, set the tray in a larger pan of water so the soil surface is submerged 1 to 2 inches deep. The seeds must remain wet at all times or they will not germinate.

Sprout at 73 to 81 F. It can take the seeds up to 8 weeks to germinate, so maintain the water level and the temperature until the first sprouts begin to emerge. After sprouting, put the tray where it will get bright, all day sun to encourage healthy growth and straight stems.