Reddish Vale Country Park


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Pineapple Weed

Pineapple Weed or Pineapple Mayweed is an introduced annual weed of road-sides, waste places and particularly trampled ground.

Very common throughout Britain.

Thought to have been introduced from Oregon in 1871.

The cone-shaped heads are hollow and the plant is strongly aromatic.


Pineapple Weed, also known as Rayless Chamomile and Rayless Mayweed was introduced to Britain prior to 1900 and within 25 years it had spread along roadsides throughout most of England. Pineapple Weed is now common throughout the UK, and is still increasing, especially on tracks and paths and on cultivated land. It occurs in cereals and broad leaved arable crops and has become a frequent weed of intensive vegetable crops.

Pineapple Weed is used medicinally, including as an effective worming treatment. The flowers smell of pineapple when crushed.

Pineapple Weed flowers June to September, sometimes into November. Insects seldom visit the flowers. Seed is set from July onwards within 40-45 days of flowering. The average seed number per plant ranges from 850 to 7,000. The weight of 1,000 seeds is 0.13g. Seeds are dispersed in mud by rain and the wind. Mud on car tyres was responsible for much of the early spread. 

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