Hardy Hibiscus
Hibiscus moscheutos
Also called rose mallow and dinner plate hibiscus
Hardy Hibiscus blooms from July through September.
Mature size, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not.
Growing Hardy Hibiscus
Plant it in full sun. It prefers high water. It is hardy in USDA zones 5–9. Expect it to reach about 3.9 ft tall and 3 ft wide at maturity, in roughly 2 years.
When to plant Hardy Hibiscus
Plant Hardy Hibiscus 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 5 to 9 range, spring means March to May and fall means September or October. Once settled, it blooms from July to September.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 7 in March.
Comes in 11 varieties across 3 colors
Same plant, same care - pick the color you are growing.
Good to know about Hardy Hibiscus
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Worth knowing
It is famously late to break dormancy, often showing no shoots until late spring or early summer. Do not assume it died over winter and dig it up. per Wisconsin and Missouri Botanical Garden
When to cut it back
Cut the dead stems to a few inches while dormant. Autumn is fine, but waiting until late winter leaves the hollow stems standing to shelter overwintering native bees. per Clemson and Wisconsin
Dinner-plate flowers
The signature trait: enormous saucer flowers about 10 to 25 cm (4 to 10 in) across, in white, pink, red or burgundy, each open for just one day. per NC State
Loves wet soil
One of the few perennials that thrives in a soggy spot, rain garden, or pond edge, even tolerating short periods of shallow standing water. per Clemson
Japanese beetle
A favorite target: adults skeletonize the leaves and chew the flowers, and heavy numbers defoliate fast. Handpick into soapy water; traps lure in more than they kill. per UGA
Hibiscus sawfly
Pale-green larvae skeletonize leaf undersides and can defoliate the plant. Handpick or hose them off, or use insecticidal soap. Bt does not work: a sawfly is not a caterpillar. per NC State
What pairs well with Hardy Hibiscus
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
English Daisy
Shares full sun and moderate to high water; blooms in mid spring, before this one opens; low at 6 in, to carpet the ground beneath; both offer pollinator forage, in different months.
Aster
Shares full sun and moderate to high water; overlaps, then carries the display into mid fall; its seed heads stand through winter, for structure and the birds; both offer pollinator forage.
Pansy
Takes full sun to part sun and moderate to high water; blooms in early spring, before this one opens; lower at 8 in, for the front of the border; both offer pollinator forage, in different months.
Chives
Shares full sun and moderate to high water; blooms in late spring, before this one opens; both offer pollinator forage, in different months; lower at 12 in, for the front of the border.
Globeflower
Takes full sun to part sun and high water; blooms in late spring, before this one opens; lower at 2 ft, for the front of the border; both offer pollinator forage, in different months.
Sweet Alyssum
Shares full sun and moderate to high water; low at 5 in, to carpet the ground beneath; overlaps, then carries the display into mid fall; both offer pollinator forage.
Autumn Crocus
Shares full sun and moderate to high water; overlaps, then carries the display into mid fall; low at 6 in, to carpet the ground beneath.
Stock
Shares full sun and moderate to high water; blooms in mid spring, before this one opens; lower at 1.6 ft, for the front of the border; both offer pollinator forage, in different months.
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