100 Heirloom Snapdragon Giant Tetra Mix Seeds Snapdragon Giant Tetra Mixture Larger florets with thicker petals and foliage than average snapdragons. Mixture in shades of red, white, pink and yellow.30" tall ,snapdragons bloom in an array of colors , Easy to grow annual , prefers full sun or partial shade, and the more you cut, the more new blooms you'll have in the fall. Planting Instructions Germination: 15 to 20 days at 70 to 75 F. Leave seeds uncovered when sowing. when transplanting do so in 15 to 20 days after sowing.