Red Sentinel
Astilbe × arendsii 'Red Sentinel'
Red Sentinel blooms from June through July.
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 Red Sentinel
Plant it in part shade. It prefers high water. It is hardy in USDA zones 4–8. Expect it to reach about 2 ft tall and 1.6 ft wide at maturity, in roughly 2 years.
When to plant Red Sentinel
Plant Red Sentinel in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. For the middle of its hardy zones 4 to 8 range, spring means March to May and fall means August or September. Once settled, it blooms from June to July.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 6 in March.
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Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.