Blue Horizon
Ageratum houstonianum 'Blue Horizon'
Blue Horizon blooms from June through October.
This entry comes from our curated library and has not yet been independently checked against outside sources. Curated is not unreliable: a standing audit keeps every entry internally consistent, and the source-by-source check is working through the whole library in the open.
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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