Blue Horizon
Ageratum houstonianum 'Blue Horizon'
Blue Horizon blooms from June through October.
Every fact this page states, and what the plant is called, was checked against named botanical sources, with the sources recorded beside each value and the unsettled points written down.
Growing Blue Horizon
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 10–11. Expect it to reach about 2 ft tall and 12 in wide at maturity, in roughly 1 year.
When to plant Blue Horizon
Wait until all danger of frost has passed, then plant out Blue Horizon into warm soil; in most zones that means late spring. Planted then, it flowers from June to October.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 10 in January.
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