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Sweet vernal grass

Anthoxanthum odoratum
It is the first grass to flower in spring and has visible white hairs at the base of the leaves. This is a useful ID feature.
Soil moisture tolerances: 
It is found on 10-20 weeks dry soil per year and less than 10 weeks wet soil per year. It is very intolerant of waterlogged conditions.
Soil fertility tolerances: 
It is typically found on moderately fertile sites (10-25 mg P/kg) or P index 1-2.
Traditional medicinal use: 
Sweet vernal grass contains coumarin; giving the smell of new hay when crushed. Chewing this grass gives a spicy sensation at the back of the throat.
Further information: 

Click here for a link to the online Atlas of the British and Irish Flora with details of the plant ecology, distribution, photos and habitats: https://www.brc.ac.uk/plantatlas/plant/anthoxanthum-odoratum