Vast variety of cultivars available. See your seed catalogue for details. They are grown on in good light in cool conditions, pinched after three pairs of leaves and planted out in the beginning of June.
Sweet peas are quite hardy and can tolerate occasional late frost.
Pea sticks, trellis or netting is provided for the young plants to start climbing on. Sweet peas will be very heavy later on and the support should be sturdy enough to withstand wind and rain. My neighbors are growing sweet peas tied to old apple trees, and particularly the pink varieties look great against the weathered gray of the stems. From the May sowing flowering starts in the beginning of August and continues until late fall. The soil should be deeply dug and fertile, and it should never be allowed to dry out.