Either way, soaking the seeds for 24 hours before planting or filing them a bit speeds germination, which takes about two weeks outside but happens much quicker indoors with bottom heat. Slugs love sweet peas, so be prepared to fend them off your seedlings. And pinching out the tips when the sweet peas are 4 or 5 inches high will give you more stems and a stronger plant. Culture Like clematis, sweet peas prefer their heads in the sun and their feet in the shade, especially in summer, so letting them shelter behind squash or beans is a good idea. Give them almost any vertical structure to climb, so long as it's suited for twining tendrils.
Regular moisture is also a necessity, as is, delightfully, regular cutting of the flowers.
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