Fragrant, ruffled blooms that define the spring cutting garden
| Type | Annual vine |
|---|---|
| Zones | All zones (cool-season crop) |
| Sun | Full sun |
| Height | 4–8 feet on support |
| Bloom Season | Late spring to early summer |
| Vase Life | 3–5 days |
| Start | Direct sow 4–6 weeks before last frost, or fall sow in mild climates |
Sweet peas are the signature flower of the spring cutting garden. Their fragrance is unforgettable—honey and vanilla and orange blossom all mixed together—and their ruffled blooms come in soft pastels, rich jewel tones, and everything in between. They demand cool weather, so timing is everything.
Spencer types are the classic choice for cutting: long stems, large ruffled blooms, and strong fragrance. 'Mammoth Mix' and individual colors from the Spencer group are widely available. If your springs are short and hot, look for early-flowering or heat-tolerant varieties. Avoid dwarf or bush varieties—they lack stem length for arranging.
Sweet peas are a cool-season crop. In zones 7 and warmer, sow seeds in fall (October/November) for early spring blooms. In colder zones, sow indoors 6–8 weeks before your last frost or direct sow as soon as the ground can be worked in early spring. Nick the seed coat or soak seeds overnight to speed germination. Plant 1 inch deep, 4–6 inches apart. See direct sow vs. transplant for more.
Sweet peas are climbing vines and need something to grab. Install a trellis, netting, or string support at planting time. A simple panel of livestock fencing or nylon netting stretched between posts works well. The vines climb by tendrils and will latch on without help. More on support structures at staking and netting.
Keep the soil consistently moist—sweet peas are thirsty. Mulch heavily to keep roots cool. Feed every two weeks with a fertilizer that leans toward phosphorus and potassium rather than nitrogen, which encourages leaf growth over flowers. They will start to decline once daytime temperatures consistently hit the mid-80s. In hot climates, afternoon shade can buy you extra weeks.
Harvest sweet peas when the bottom flower on the stem is fully open and the top buds are just starting to show color. Cut stems as long as possible. Crucially, you must harvest sweet peas aggressively—if you allow seed pods to form, the plant will stop blooming. Pick every stem that is ready, even if you do not need them all. More at harvest timing.
Sweet peas are delicate. Expect 3–5 days in the vase. Cut into cool water, strip lower leaves, and add floral preservative. Keep arrangements out of direct sun and away from fruit (ethylene gas shortens their life). See the conditioning guide.
Sweet peas work best in loose, informal arrangements where their fragrance and ruffled texture can shine. They are lovely on their own in a small jar, or mixed with other spring flowers like ranunculus, anemones, and fern fronds. They are a natural choice for spring arrangements.
External: Sweet Pea Society (UK)