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Ageratum A. houstonianum Full sun to light shade. Space 6-9". Blooms June-frost. Deadhead to prolong bloom. For edging and combination plantings. Needs well-drained porous soil and well-balanced phosphorous-rich fertilizer. Spray with Diazinon monthly to prevent red spider build-up. If it goes out of bloom, cut back.
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'Blue Danube' - 6". Earlier and more compact plants are cover with mid-blue flowers. 'Blue Horizon' 24-30". Excellent for landscaping and cut flowers. 'Lemon Lime' - Purple blue flowers over variegated foliage. 'Patina Blue' - 10-12". Mid blue. More heat tolerant, vigorous and uniform than seed ageratum.'Tycoon Blue' - 6". Mid blue. Early bloomer.
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