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annual pink (Dianthus chinensis)

Dianthus chinensis is a herbaceous plant with a branching, clump-forming habit. Sources differ in describing its life cycle: it is a perennial herb, while in horticultural cultivation it is often grown as an annual or biennial.

LightA position with abundant sunlight and good ventilation is preferred, while afternoon shade can be provided in warmer regions.
WaterKeep the growing medium dry to moderately moist and avoid waterlogging, as poor drainage readily leads to crown rot.
HumidityDianthus chinensis is reported to need good airflow.
TemperatureA single source reports an ideal temperature range of about 12–27 °C, so sources are few.
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Overview

Dianthus chinensis is a herbaceous plant with a branching, clump-forming habit. Sources differ in describing its life cycle: it is a perennial herb, while in horticultural cultivation it is often grown as an annual or biennial.

Origin and habitat

Sources differ somewhat on its native range, placing it in East Asia, mainly including China, Korea, Mongolia, and southeastern to Far Eastern Russia, with some also including Kazakhstan. It occurs in grasslands, grassy slopes, meadows, open woodland and forest margins, as well as shrubland, rocky valleys and areas near streams. It is widely cultivated in temperate regions and favors warm conditions, but performs less well in hot conditions.

Characteristics

Sources differ and are few on mature height, reporting about 30–50 cm. The leaves are narrow and elongated, linear to linear-lanceolate, green to gray-green, and opposite; basal leaves may have withered by flowering time. Sources differ somewhat on flower color, describing white, pink, deep pink, red to dark red, with purple also reported; the petals have toothed or fringed notches and often darker central markings, and flowers may occur singly, in pairs or in small cymes, with horticultural varieties potentially bearing more flowers per inflorescence. Flowering is mainly from spring through summer and can continue into autumn under cultivation, with better performance in spring and autumn in Taiwan; the fruit is reported to be a capsule enclosed by the sepals that splits by teeth when mature, with black, flat, nearly round seeds.

Light

A position with abundant sunlight and good ventilation is preferred, while afternoon shade can be provided in warmer regions.

Watering

Keep the growing medium dry to moderately moist and avoid waterlogging, as poor drainage readily leads to crown rot.

Humidity and airflow

Dianthus chinensis is reported to need good airflow.

Temperature and dormancy

A single source reports an ideal temperature range of about 12–27 °C, so sources are few.

Growing medium and mounting

Well-drained sandy loam or loam is preferred, and the plant can adapt to dry soil; Useful Temperate Plants additionally describes a preference for fertile, well-drained, neutral to alkaline loam.

Feeding

The plant is reported to have low nutrient requirements, with flower fertilizer applied periodically during cultivation.

Propagation

It is reported to be propagated mainly by seed, though cuttings can also be used; sowing is suitable from autumn and winter into early spring, while vigorous side shoots can be used as cuttings and managed away from strong light while rooting.

Common problems

When grown in excessively shaded conditions, Dianthus chinensis is reported to be vulnerable to damage from slugs and snails. Poor drainage is reported to favor crown rot, and rust may also occur. It performs poorly during hot, humid summers; poor drainage increases the risk of rot and disease, while excessive shade can increase problems with slugs and snails. It does not tolerate extreme heat well; in Taiwan, excessive heat or cold can impair growth, with hot, humid summers being particularly unfavorable.

Identification

Dianthus chinensis can be distinguished by its narrow, gray-green opposite leaves, clump-forming and branching habit, flowers with conspicuously toothed or fringed notches and often dark centers, and pointed bracts beneath the flowers.

Photos

Dianthus chinensis
📷 unknown · CC BY-SA 3.0 · source
Dianthus chinensis
📷 Yves Bas, some rights reserved (CC BY), uploaded by Yves Bas · CC BY · source

Sources