For best results, prepare the sweet pea bed the previous fall. Cultivate the soil to 45cm (18") deep, incorporating a generous amount of finished compost. Also dig in bone meal. At transplant time, dig ¼ cup complete organic fertilizer into the soil beneath each plant. Space vines at 15cm (6") and provide trellis support. Mulch around plants to keep the soil as cool as possible, and water during dry weather. Keep plants picked to prolong the blooming period.