Castlewellan Sweet Pea is a Spencer-type sweet pea with exceptionally tender, multicolored blooms that blend soft pink with peach and white undertones. This frost-tolerant cultivar grows 6 to 8 feet tall and produces flowers within 75 to 85 days, thriving in the cool months of spring and fall across hardiness zones 2 through 11. Sown in early spring about three months before the last frost, it rewards frequent harvesting with a continuous supply of delicate, sweetly scented blooms that are poisonous and ornamental only.
Full Sun
Moderate
2-11
96in H x ?in W
—
High
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The soft, blushed petals of Castlewellan display a sophisticated color palette that feels almost watercolor-painted: pink flushed with peach and touches of white, all held on the larger flowers characteristic of Spencer-type sweet peas. This variety thrives in cool seasons and demands frequent cutting, which only encourages it to produce more flowers in an endless cycle of color and fragrance. It's a spring and fall lover that grows best when sown early enough to establish roots before warm weather arrives.
Castlewellan Sweet Pea is grown exclusively as an ornamental flower for cutting. The blooms are prized for fresh arrangements and bouquets, where their delicate aroma and soft coloring bring elegance to indoor spaces. Regular harvesting extends the blooming period and is encouraged as part of the plant's management.
No timeline data available yet for this variety.
Start seeds indoors in a chilly, semi-protected location about three months before your last spring frost. This early start ensures strong root development before transplanting.
Transplant seedlings outdoors about 6 weeks before the last spring frost. Space plants 8 inches apart in rows 36 inches apart. Choose a location with full sun exposure.
Begin cutting flowers once they are fully open and have developed color. Cut stems in the early morning for longest vase life. Harvest frequently, removing entire flower stems rather than individual blossoms. This variety responds to regular cutting by producing more blooms over an extended season. Important: these flowers are poisonous and for ornamental use only; do not ingest.
Pinch or cut flower stems regularly and frequently. Harvesting blooms encourages branching and prolongs the flowering season by preventing seed set. Remove spent flowers promptly to maintain vigor.
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