Tall Blue Planet Ageratum is an F1 hybrid that brings upright elegance to gardens and cutting gardens across zones 2-11. Rising on sturdy, compact stems, this variety blooms in roughly 80-100 days from seed, producing flower spikes in that signature ageratum blue that looks stunning in fresh or dried arrangements. The upright growth habit and robust stems make it reliable for gardeners who want height without fussiness, flourishing in moderate water and slightly acidic to neutral soil (pH 6.0-7.0).
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Moderate
2-11
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High
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The defining trait here is those tall, sturdy stems that stand upright without pinching or staking, a rarity in compact ageratum varieties. This hybrid excels as a cut flower when spikes are three-quarters open, and dries beautifully when harvested fully open, though hang-drying preserves color better than air-drying. Space plants 9 inches apart for a full display, and you'll have reliable, prolific blooms from midsummer onward in most regions.
Tall Blue Planet Ageratum shines in the cutting garden and as a dried flower for arrangements and crafts. Harvest spikes when they're three-quarters open for fresh bouquets, or wait until flowers are completely open, then hang them to dry. The color holds better with careful hang-drying than with air-drying methods.
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Sow seeds 6-8 weeks before your last frost date. Do not cover the seed, as light aids germination. Bottom water or mist gently to avoid displacing seed with water pressure. Maintain soil temperature around 70-75°F for best results. Once the first true leaves appear, transplant seedlings into cell packs or larger containers.
Harden off seedlings for 7-10 days before transplanting after the danger of frost has passed. Space plants 9 inches apart in the garden. This variety is frost-tender, so wait until soil has warmed and night temperatures stay above freezing.
Direct seeding is not recommended for this variety.
For fresh flowers, harvest spikes when they are three-quarters open. For dried flowers, harvest when blooms are completely open and hang them to dry; this preserves color better than air-drying, though color may still fade slightly with the latter method.
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