Blue Horizon blooms continuously from late spring to frost. Long-lasting, lavender-blue flowers on 18 to 30 in. tall plants. One of the best ageratums for cut flowers.
Growing Blue Horizon Ageratum Seeds
Plant Ageratum Seeds: Sow seeds in cell packs or flats, press into soil but do not cover. Needs light to germinate. Kept at 75°F., germination is in 5-14 days. Can direct sow after all danger of frost in groups of 3-4 seeds spaced 6-12 in. apart. Thin to the strongest plant.
Grow Ageratum: Full sun in cooler climates, part shade elsewhere. Prefers rich, moist soil. Blooms are extraordinarily long-lived, dead heading is necessary, yet infrequent. Plants are low maintenance, resist rabbits and deer. Flowers attract bees and butterflies.
U.S. Shipping Rates
Free shipping on U.S. orders over $60.00.
Free priority shipping on U.S. orders over $150.00.
Standard U.S. shipping is $5.99.
Priority U.S. shipping is $9.99.
International Shipping Rates
Shipping to Canada is $13.99.
International shipping to all other countries is $15.99.
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 replacements or issue a refund.