The long, straight silver stems of Platinum Blue globe thistle hold large, 3 in. tight round clusters of brilliant sky-blue flowers in July and August. Flowers attract butterflies and are beautiful additions to fresh cut or dried arrangements.
Plants grow to 3 ft. tall — leaves are finely-cut and thistle-like with an attractive silvery luster. Platinum Blue globe thistle requires little care and will tolerate heat and poor soil when drainage is good. Average water brings the most flowers. Winter hardy to zone 3.
Growing Platinum Blue Globe Thistle Seeds
Plant Globe Thistle Seeds: Sow globe thistle seed in cell packs or flats, press into soil, do not cover. Light aids germination. Kept at 65-70° F., germination is in 14-21 days. Can direct sow globe thistle into prepared seed beds in groups of 4 seeds, spaced 2 ft. apart. Thin to the strongest plant.
Grow Globe Thistle: Full sun. Plants thrive in poor, alkaline soil, adapt well to average soil. Drought tolerant once established, more flowers with moderate water. Globe thistle is fast growing, long-lived (10 years or more), and not invasive. Plants are deer and rabbit resistant. Flowers attract bees, birds, and butterflies.
U.S. Shipping Rates
Free shipping on U.S. orders over $60.00.
Free priority shipping on U.S. orders over $125.00.
Standard U.S. shipping is $5.99.
Priority U.S. shipping is $9.99.
International Shipping Rates
Shipping to Canada is $9.99.
International shipping to all other countries is $14.99.
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 replacement packets or issue a refund.