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cayenne pepper (Capsicum annuum)

Capsicum annuum ranges from herbaceous to shrub-like, with many branches; its base may become woody, and in warm regions it can form a shrub-like perennial plant. Sources describe its life cycle differently: it can inherently be perennial but is often cultivated as an annual, particularly in temperate climates, while it may survive for multiple years in frost-free or tropical environments.

LightCapsicum annuum prefers full sun, while indoor cultivation requires bright light.
WaterIt prefers a well-drained growing medium and has some drought tolerance; excessive rainfall may reduce flowering and fruiting and increase disease.
TemperatureFew sources report a lower temperature of about -1.1 °C, an ideal range of about 21–25 °C, and an upper temperature of about 32 °C. Capsicum annuum tolerates brief light frost.
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Overview

Capsicum annuum ranges from herbaceous to shrub-like, with many branches; its base may become woody, and in warm regions it can form a shrub-like perennial plant. Sources describe its life cycle differently: it can inherently be perennial but is often cultivated as an annual, particularly in temperate climates, while it may survive for multiple years in frost-free or tropical environments.

Origin and habitat

Sources differ on the exact boundaries of its native range in the Americas, which is mainly described as extending across southern North America and Mexico through Central America to northern South America. Its original wild habitat is reported to be unknown, and it is now widely cultivated. It is suited to warm climates and is widely cultivated from warm-temperate to tropical climates; it may be perennial in tropical lowlands and is also commonly grown as an annual in warm-temperate and subtropical climates.

Characteristics

Sources differ, placing mature height at about 50–200 cm. Few sources report a mature spread of about 10–50 cm. The simple leaves are alternate, ranging from ovate to ovate-lanceolate, with pointed tips and entire margins. Flowers are usually white and generally solitary in the leaf axils or at stem branches, while some plants may have flowers tinged with purple; sources describe fruit as varying greatly in shape, size, color, and pungency, including elongated, round, and bell-shaped forms that are often green when immature and commonly red, yellow, or purple when mature.

Light

Capsicum annuum prefers full sun, while indoor cultivation requires bright light.

Watering

It prefers a well-drained growing medium and has some drought tolerance; excessive rainfall may reduce flowering and fruiting and increase disease.

Temperature and dormancy

Few sources report a lower temperature of about -1.1 °C, an ideal range of about 21–25 °C, and an upper temperature of about 32 °C. Capsicum annuum tolerates brief light frost.

Growing medium and mounting

It is suited to fertile, humus-rich, well-drained loam or sandy soil and prefers slightly acidic to neutral conditions.

Propagation

Capsicum annuum can be propagated from seed; in regions with cold seasons, seedlings may be started indoors before the last frost and later moved outdoors.

Common problems

Reported pests include aphids, caterpillars, European pepper moth, silverleaf whitefly, greenhouse whitefly, and other vegetable pepper pests. Reported diseases include southern bacterial wilt, Phytophthora disease, southern blight, pepper anthracnose, and bacterial spot of pepper and tomato. Blossom-end rot may occur, and excessive rainfall may reduce flowering and fruiting and promote disease. It is sensitive to frost and cold and requires consistently warm conditions for good growth; in cold regions it is generally grown as an annual, although some sources indicate that it can occasionally tolerate light frost.

Identification

Capsicum annuum includes many cultivated forms, including sweet peppers, chili peppers, and paprika types, with substantial variation in fruit shape, color, size, and capsaicin expression; it typically has white flowers, alternate simple leaves, and fruits containing many seeds.

Photos

Capsicum annuum
📷 Franz Eugen Köhler, Köhler's Medizinal-Pflanzen · Public domain · source
Capsicum annuum
📷 Kod B · CC BY-SA 4.0 · source

Sources