Zinnias add bold, vibrant color to gardens. The more you cut, the more they bloom! Heat-loving and very easy to grow. Space plants of small kinds 8-10" apart, taller kinds up to 18" apart. Burpee's Big Tetra Mix. Dahlia-flowered blooms, 6" across: pink, yellow, orange, scarlet, white, and more. Attracts Butterflies.