Adding sugar or flower preservative to the water makes a big difference and will add a few extra days. Sweet peas are a short-lived cut flower, lasting at best 4 to 5 days in a vase. While they can be picked when more open, their vase life won’t be as long. For the longest vase life, pick stems that have at least 2 unopened flowers at the tip. To prolong blooming, it’s important that you keep plants from setting seed, so be sure to harvest and deadhead the flowers frequently.Keeping their thirst quenched during warm weather is crucial, so set up drip irrigation or soaker hoses as soon as you plant them. Sweet peas love water, and without consistent moisture, they won’t thrive.Once the vines get going, you can expect over 1 ft (30 cm) of growth a week, so be sure to stay on top of tying. Keep them tied to the trellis to produce straight stems. Around the last spring frost, plant out seedlings in 2 rows, one on each side of the trellis, roughly 8 in (20 cm) apart down the row.Place tall posts roughly 8 ft (2.4 m) apart down the row and attach either Tenax Hortonova netting or 6-ft-high (1.8 m) metal fencing for them to scramble up. Vines grow rapidly and require a spot that gets full sun, as well as a strong structure to climb.Nicking the seed with a nail clipper breaks the outer coat of the seed so it can absorb water immediately. So, in addition to the standard soil preparation, I run a trench 1 ft (30 cm) deep down the center of the bed and fill it with compost or well-rotted manure, so that once the sweet peas send their roots down deep, there is a feast awaiting them. You may choose to nick your sweet pea seeds before planting. Transplant your seedlings into small pots or trays filled with peat-free multi-purpose compost. This will encourage the plant to branch vigorously from the base. Once plants are 4 to 6 in (10 to 15 cm) tall, pinch out the central growing tip, just above a leaf joint, leaving just 2 or 3 leaf nodes.Place in a cool greenhouse or in a bright window in the house. Cover pots with a plastic dome lid to increase humidity and speed up germination.Plant two seeds per pot, poking them ½ in (1.25 cm) into the soil with your finger.I use pots that are 3½ in (9 cm) wide and deep. Sweet peas produce a ton of roots even in the beginning, so the more room you can give them during the early stages of life, the better they will grow in the long run. While the seeds are soaking, fill your planting pots with soil.This softens the seed coat and speeds the sprouting process by a few days. Soak your seeds for 24 hours before sowing. Everywhere else, sow in late winter/early spring. In warmer regions where winter weather is mild, sow sweet peas in autumn.
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