Seattle Tilth’s Edible Plant Sale takes place on May 3-4. Take your pick of tantalizing veggies, including heirloom varieties and an extensive selection of culinary herbs, edible flowers and drought-tolerant perennials. There’s also plenty of summer gardening plants, aka “warm season” crops, like tomatoes, peppers and squash. The Early Bird Sale Friday (5/2) 5-7 p.m.,…