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key growing information
Growing Sweet Peas From Seed
How to grow sweet peas from seed: presoaking, darkness for germination, transplants or direct sowing, pinching and trellising, vase life, cutting stage, soil, mulch and uses.
By Hensley’s Seed Co.
Sweet Peas - Key Growing Information
DAYS TO GERMINATION:
Allow 14–21 days at 55–65°F (13–18°C). Soaking the seed for 24 hours in room-temperature water before sowing helps germination.
SOWING:
Transplants are recommended: sow ¼–½" deep, since the seed needs darkness to sprout, into 72-cell flats or another deep-cell container 4–5 weeks before planting out. To sow in place, plant 2–3 seeds every 6", ¼–½" deep. Seedlings handle a light frost. Pinch at 6–8" tall for bushier plants and more flowers, and give them a trellis. Thin as needed once the first true leaves appear.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
Depends on the variety; plants need support such as Hortonova vertical trellis netting.
PLANT SPACING:
Space plants 4–8" apart.
HARDINESS ZONES:
Grown as an annual.
STEM LENGTH:
6-16".
VASE LIFE:
Lasts 4–6 days in the vase. Sweet peas don't keep well, but if you must hold them, store at 36–39°F (2–4°C).
HARVEST:
Cut when half the flowers on a stem are open; regular cutting brings more blooms.
SOIL REQUIREMENTS:
Rich, deep, moist loam with good drainage, ideally pH 6–7.
TIP:
White-on-black plastic or straw mulch keeps the roots cool and plants producing longer.
USES:
Cut flowers, the back of borders, fences, trellises, arbors and cottage gardens.
SCIENTIFIC NAME:
Lathyrus odoratus
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