Sweet pea plants night skyenjoy the alluring tones of sweet pea night sky around your garden this summer! Enjoy as the flowers of this sweet pea practically shimmer atop long slender stems. Gardeners will be in amazement as this unusually coloured sweet pea dazzles flower displays around your garden. The sweet pea night sky make for fantastic cut flower displays around your home, complemented by their amazing fragrance!sweet peas love sunny spots so grow them in a sunny flower bed or border. They also do well being trained along fences, trellis or decorative obelisks. Sweet pea night sky flowers between june and september. Height 200 250cm 79 84.caring for your sweet peasfor planting directly into the garden, ensure that the soil has been dug over and lumps broken down, then plant straight into their flowering position. In areas where the existing soil is poor, incorporate a good handful of compost into each area you are planting.