McKanna's Giant columbine carries large, long-spurred, 2-4 in. flowers. Late-spring and early-summer blooms appear in a wide range of colors including yellow, peach, purple, crimson, scarlet, white, blue, and pink. They make excellent cut flowers. Plants grow 2-3´ tall, are winter hardy to zone 3.
Growing McKanna's Giant Columbine Seeds
Plant Columbine Seeds: Sow columbine seeds in cell packs or flats, press into soil, do not cover. Needs light to germinate. Kept at 65 to 70° F., seedlings emerge in 21 to 28 days. Can direct sow columbine seeds into prepared seed beds in groups of 3 to 4 seeds, spaced 10 to 18 in. apart. Thin to the strongest plant.
Grow Columbine: Full sun in mild climates, part to light shade where it is warm. Best performance in moist, well drained soil — will tolerate average water. For cut flowers, harvest blooms as they begin to open. Typical vase life is 5 to 7 days. Pinch or cut off spent flowers to extend bloom season. Flowers attract hummingbirds and butterflies. Plants are deer and rabbit resistant.
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We guarantee all the seeds we sell for one full year from the date of purchase. If you are unsatisfied with any seeds purchased from Swallowtail Garden Seeds, we will issue a refund. For customers in the U.S., we can send one-time replacements or issue a refund.