Overview

Sorghum halepense is a perennial grass in the genus Sorghum, part of the Q43238 family. It typically grows around 2.0 m tall. Sorghum halepense grows best in full sun, and tolerates most soils. Its UK hardiness is rated H5. It is native to Asia and Northern Africa.

About

Sorghum halepense is a perennial grass reaching about 2.0 m and typically found in open, sunny positions. It flowers from July to October. The plant grows in a range of soils from sandy to clay, favouring well‑drained or moist but well‑drained conditions. It is toxic to livestock and should not be grazed.

Wikipedia contributors, CC BY-SA 4.0 — Johnson grass

In the garden

Sorghum halepense (Johnson Grass) is a tall perennial grass native to Asia and northern Africa that commonly reaches around 2.0 m. Flowering occurs from July to October. The botanical identity sits in the Sorghum genus, and the species establishes where light and space are available. Plant it in full sun on soils described as sandy, loamy or clay; the key is good drainage and a preference for moist but well‑drained conditions rather than waterlogging. Its UK hardiness is H5, so it is considered hardy across much of Britain; the US hardiness range is USDA 7–10. Position the crown where it will receive uninterrupted sun and avoid shaded or heavily waterlogged spots. In a garden context, place tall stands at the rear of a mixed border, in sunny grass margins or where a tall grass form is required for screening on open sites. Because the species is toxic to livestock, ensure any planted areas are fenced or otherwise kept out of reach of grazing animals to prevent accidental ingestion.

Growing conditions

Best soil and position for Sorghum

Sunlight

Full sun

Soil type

Sandy, Loamy, Clay

Soil moisture

Well-drained, Moist but well-drained

Exposure

Full sun

UK hardiness

H5

Plant details

Sorghum halepense size, habit and characteristics

Plant type

Perennial grass

Height

2.0 m

Native to

Asia, Northern Africa

Toxicity

Toxic to livestock

Care notes

Pruning and caring for Sorghum halepense

Propagation

Rhizomes, Seed

Frequently asked questions