Sweet pea (Lathyrus odoratus) is a fragrant annual vine that climbs 6 to 8 feet in a single season when trellised, or grows as a bushy mound to 2.5 feet without support. The name 'odoratus' speaks to its defining trait: intensely fragrant, showy flowers that bloom from May through July in clusters along winged stems. This cool-season annual thrives in full sun with moderate water and moderate maintenance, flowering prolifically before heat stress sets in. Unlike edible peas, sweet pea flowers and fruits are poisonous and grown purely for their extraordinary scent and visual appeal.
Full Sun
Moderate
2-11
96in H x 36in W
—
High
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The fragrance is the whole story here. Sweet pea flowers release a rich, complex perfume that intensifies in cool mornings, making them legendary among cut-flower gardeners and anyone seeking to fill a garden with scent. Growth is vigorous and responsive: give it a trellis and it will race skyward to 6 or 8 feet; leave it unsupported and it stays compact at 2.5 feet, adapting to your space. The flowers cluster densely on winged stems clad with paired leaflets that end in tendrils, creating an elegant, cottage-garden aesthetic. Blooming from May straight through July in the right conditions, it delivers weeks of cut flowers and continuous garden color during peak growing season.
Sweet pea is grown almost exclusively for its flowers rather than for food. The blooms are prized as cut flowers for fresh arrangements, where their intense fragrance fills indoor spaces for days. Gardeners plant sweet pea to create vertical interest and scent in borders, cottage gardens, and along trellises or fences. The flowers are popular in heritage and fragrant gardens where sensory experience matters as much as visual appeal.
No timeline data available yet for this variety.
Start seeds indoors 4 to 6 weeks before the last spring frost at soil temperatures between 50 and 70 degrees Fahrenheit. Soak seeds overnight or scarify them lightly to improve germination rates. Sweet pea germinates best in cool conditions, so keep seedlings in a cool spot and avoid overheating indoors.
Transplant seedlings outdoors after the last frost date when soil temperatures have warmed slightly. Sweet pea is frost-tolerant and actually prefers cool spring conditions, so timing is flexible. Space transplants 24 to 36 inches apart. Install trellises or climbing supports at planting time so tendrils can begin their ascent immediately.
Direct sow seeds in early spring as soon as soil can be worked, or in fall in mild climates for winter germination. Sweet pea prefers direct sowing when conditions allow, and its cool-season preference makes early spring or fall the ideal windows.
Cut flowers early in the morning when they are fully hydrated and fragrance is most intense. Harvest blooms when the first two or three flowers in each cluster have opened; buds will continue opening in the vase. Grasp the stem firmly and snap or cut it cleanly. Regular harvesting prolongs blooming and prevents the plant from exhausting itself setting seed.
Sweet pea requires no formal pruning, but deadheading spent flower clusters encourages continuous blooming throughout the season. When plants are trellised, gently guide tendrils toward the support structure so they can climb naturally. If growing as an unsupported bushy mound, no intervention is necessary beyond removing dead or damaged foliage.
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