2nd Year Maturity. McKana's Giant seeds grow the absolute tallest, brightest, and most vivid columbines in the country. McKana's Giant columbine is a perennial that matures at 24-36 inches tall and boasts enormous 3-4 inch classic summertime blooms. Columbine is native to the temperate and shaded woodlands of Colorado and promises to thrive in many similar gardens. McKana's Giant columbine is versatile enough to keep indoors, on the porch, or as a timeless American grow among untamed wildflower mixes.