March 15 is the magical number for getting those wild vines in the ground growing. We set our seeds in the greenhouse early January keeping them warm and sheltered until daytime temps hit the 70's. Then the growing plants are given daytime exposure to sun and breeze to strengthen their stems and stretch their leaves.
The bare facts:Start seeds in the greenhouse the first of January
Transplant hardened off plants March 1 through 31 (Temps ranging from 51 to 73)
Succession planting is recommended- use trellis or cage support
Common Southern Varieties:
Early girl/Better boy - hybrid
Arkansas traveler- heirloom
Viva Italia- hybrid
My personal seed resource favorites are Producer's Co-op, and Southern Exposure Seed Exchange.