Lolium temulentum, commonly known as darnel or poison darnel, is an annual grass that is often considered a weed in cereal crops and is native to temperate Eurasia and North Africa. It typically grows up to 3 feet tall and closely resembles wheat until it produces its ear, which bears a superficial similarity to wheat but is distinguishable upon closer inspection. Darnel usually has a more slender form and a less robust ear than wheat. The plant flowers in the summer, and its flowers are not particularly showy, being typical of grass species. Darnel is known for its association with endophytic fungi that produce loline alkaloids, making the plant toxic and capable of causing symptoms such as dizziness and nausea if ingested.

Darnel is not typically cultivated due to its toxic nature and its ability to compete with crops such as wheat. It is often found in wheat fields, where it can be problematic for farmers. In cultivation, it requires similar conditions to wheat, thriving in full sun and well-drained soils. However, due to its toxicity and invasive potential, it is not recommended for planting in gardens or agricultural areas outside its native range. Gardeners should be aware of its potential to spread and its ability to contaminate cereal grains.CC BY-SA 4.0