Alcea rosea (Hollyhock)


Botanical Information

FamilyMalvaceae
GenusAlcea
Speciesrosea
SynonymsAlthaea rosea
CategoryPerennials
TypeShrub (deciduous)
OriginNative to Europe.

Details

USDA Hardiness Zone2 - 10
USDA Hardiness Ref.
Canada Hardiness Ref.
RHS Hardiness ZoneH5
RHS Hardiness Ref.
Temperature (°C)-15° - (-10)°
Height1.5 - 2.5 m
Spread.5 - 1 m
Flowering PeriodJune, July, August

Description and Growing Information

General DescriptionGenus name is the Latin name from the Greek word alkaia for a kind of mallow.
ShapeColumnar and upright.
LandscapeFlower borders/beds, wall-side borders, cottages and informal gardens.
PropagationSeed. Sown in gentle hear in mid-winter or in-situ in spring.
CultivationFull sun and partial-shade. Well-drained, chalk, sand or loam with a neutral, acid or alkaline pH.
PestsSlugs, caterpillars and flea beetles when young growth. Susceptible to rust, leaf spot and anthracnose. Spider mites and Japanese beetles can be a problem.
Notable SpecimensKincarden, Ontario, Canada.
Leaf DescriptionLarge, heart-shaped leaves that have 3 - 7 lobes and gets progressively smaller towards the top of the spire. Rigid, towering spikes or spires that reach a height of 1 - 2.5 m tall.
Flower DescriptionShowy funnel-shapped flowers. Tall and erect racemes in summer. 10 - 12 cm in diameter, outward-facing, single flowers.
Colour DescriptionFlowers are a purplish-pink, reddish-white or yellow in colour. The leaves are green in colour.
Texture DescriptionThe leaves are rough in texture.

Photographs