''Alcea rosea'', the common hollyhock, is an

ornamental Ornamental may refer to: *Ornamental grass, a type of grass grown as a decoration *Ornamental iron, mild steel that has been formed into decorative shapes, similar to wrought iron work *Ornamental plant, a plant that is grown for its ornamental qua ...

dicot The dicotyledons, also known as dicots (or, more rarely, dicotyls), are one of the two groups into which all the flowering plants (angiosperms) were formerly divided. The name refers to one of the typical characteristics of the group: namely, t ...

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. They include all forbs (flowering plants without a woody stem), grasses and grass-like plants, a vast majority of ...

in the

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Malvaceae Malvaceae, or the mallows, is a family of flowering plants estimated to contain 244 genera with 4225 known species. Well-known members of economic importance include okra, cotton, cacao and durian. There are also some genera containing familiar o ...

. It was imported into Europe from southwestern China during, or possibly before, the 15th century. William Turner, a herbalist of the time, gave it the name "holyoke" from which the English name derives.

Cultivation

''Alcea rosea'' is variously described as a biennial (having a two-year life cycle), as an

annual Annual may refer to: * Annual publication, periodical publications appearing regularly once per year **Yearbook **Literary annual * Annual plant *Annual report *Annual giving *Annual, Morocco, a settlement in northeastern Morocco *Annuals (band), ...

, or as a short-lived

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...

. It frequently self-sows, which may create a perception that the

plants Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclud ...

are perennial. The plant may flower during its first year when sown early. It will grow in a wide range of soils, and can easily reach a height of The flowers are in a range of colours from white to dark red, including pink, yellow and orange. Different colours prefer different soils. The darker red variety seems to favour sandy soils, while the lighter colour seems to favour clay soils. The plants are easily grown from seed, and readily self-seed. However, tender plants, whether young from seed or from old stock, may be wiped out by slugs and snails. The foliage is subject to attack from

rust Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture. Rust consists of hydrous iron(III) oxides (Fe2O3·nH2O) and iron(III) oxide-hydroxide (FeO(OH), ...

('' Puccinia malvacearum''), which may be treated with fungicides. Commercial growers have reported that some closely related species ('' Alcea rugosa'' and '' Alcea ficifolia'') are resistant to this fungus.

Properties

Growing up to 8 feet tall, this plant usually does not require staking, producing large flowers around 5 inches in diameter. Its leaves are large and heart-shaped. The flowers attract hummingbirds and butterflies.

Pests and diseases

The leaves are vulnerable to

, leaf spot and

anthracnose A plant canker is a small area of dead tissue, which grows slowly, often over years. Some cankers are of only minor consequence, but others are ultimately lethal and therefore can have major economic implications for agriculture and horticultur ...

. Pest problems include Japanese beetle and spider mites. Though damage to the leaves can be extensive, the flowers are rarely affected.

Herbalism

In herbal medicine, hollyhock is believed to be an

emollient A moisturizer, or emollient, is a cosmetic preparation used for protecting, moisturizing, and lubricating the skin. These functions are normally performed by sebum produced by healthy skin. The word "emollient" is derived from the Latin verb ''m ...

and

laxative Laxatives, purgatives, or aperients are substances that loosen stools and increase bowel movements. They are used to treat and prevent constipation. Laxatives vary as to how they work and the side effects they may have. Certain stimulant, lub ...

. It is used to control

inflammation Inflammation (from la, wikt:en:inflammatio#Latin, inflammatio) is part of the complex biological response of body tissues to harmful stimuli, such as pathogens, damaged cells, or Irritation, irritants, and is a protective response involving im ...

, to stop

bedwetting Nocturnal enuresis, also informally called bedwetting, is involuntary urination while asleep after the age at which bladder control usually begins. Bedwetting in children and adults can result in emotional stress. Complications can include urina ...

and as a mouthwash in cases of bleeding gums.Howard, Michael. ''Traditional Folk Remedies'' (Century, 1987) p.155

Gallery

File:2021-06-06 Althaea rosea タチアオイ（立葵、学名：Althaea rosea、シノニム：Alcea rosea）DSCF3025.jpg, In Japan File:Alcea rosea nigra.JPG, alt=Black hollyhock (Alcea rosa nigra), Black cultivar 'Nigra' File:'Blacknight' hollyhock IMG 9621.jpg, alt=Hollyhock ‘Blacknight', ‘Blacknight' חוטמית תרבותית.jpg, In Israel File:Alcea rosea01.jpg File:Hollyhock 1r.jpg File:ALTHAEA ROSEA - TORÀ - IB-737 (Malva reial).JPG

References

{{Authority control

rosea Rosea may refer to: * a Latin adjective meaning rose, rosy or pink * a synonym for Rhosus, a Roman Catholic titular see * a hamlet of the municipality of Brunello, Italy * a character in the Valkyrie Profile: Covenant of the Plume videogame S ...

Flora of China Medicinal plants of Asia Plants described in 1753 Taxa named by Carl Linnaeus Flora of Malta