Hibiscus laevis, commonly called smooth rose mallow or halberd-leaved rose mallow, is a Missouri native herbaceous perennial which typically occurs in wet soils along streams, rivers, ponds, sloughs, ditches and swampy areas throughout much of the State. Perhaps most easily distinguished by its three-lobed leaves (to 6" long) which resemble the shape of the 15th-16th century halberd spear. Large, 5-petaled, hollyhock-like flowers (to 6" diameter) with white to pink petals and maroon eyes appear from mid-summer into fall on smooth stout stems rising 4-6' tall. Each flower has a prominent and showy center staminal column. Synonymous with and formerly known as Hibiscus militaris, the specific epithet being in reference to the leaf-shape resemblance to a military weapon. (info source: missouribotanicalgarden.org)
Genus - Hibiscus
Species - Laevis
Common name - Rose Mallow
Pre-Treatment - Not-required
Hardiness zones - 4 - 9
Height - 4'-5' / 1,20 - 1,70 m
Spread - 2'-4' / 0.60 - 1.20 m
Plant type - Shruby flower
Vegetation type - Deciduous
Exposure - Full sun
Growth rate - Fast
Soil PH - Acidic, Neutral
Soil type - Rich soils, Clay, loam, well drained
Water requirements - Average, moist
Landscape uses - A tall mallow for moist soils along bodies of water or in low spots. Also effective in border rears, cottage gardens or native plant gardens.
Germination rate - 86%
Bloom season - August to September
Leaf / Flower color - Green, Dark Green / White to pink
|Germination||Sow seeds indoors from February to April.|
Soak seeds overnight and sow 5 mm deep in a well drained potting mix.
Place in very bright and warm (~+22-25) location until germination.
Germination normally takes 7-14 days.