77-84 days. Giant Imperial Mix seeds promise some of the tallest, brightest, and most vivid larkspurs available in any garden. Giant Imperial Mix seeds grow dense and elegant spikes flourishing in a seasonal mix of blue, violet, rose, red, lavender, salmon, pink, and white florets. Giant Imperial Mix larkspur is easy to grow from seed and offers full-season blooming from spring until the frost. Giant Imperial Mix seeds mature into robust 36-48" tall stalks perfect for attracting butterflies or accenting any fresh-cut bouquet, basket, or centerpiece.