Spring groundsel is a 15-40 cm tall, annual plant with yellow flowers. The plant grows in the dry sand dunes, where it blooms in May-June. The plant is toxic and especially dangerous for horses grazing where the plant grows. The plant retains its toxicity even in the dried state, so if it is merged with hay it is a major problem in relation to feed for horses and other animals.

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Ingestion of the toxic plant may result in impaired liver function and horses and other large animals may die from eating the plant.