Creeping Thistle is a common perennial weed that spreads by seed and is found throughout the UK. It is very common on newly sown areas. The leaves are wavy with spines along the edges. The flowers can be seen from July to September, they form in clusters and are a lilac / purple colour. Creeping Thistle's can grow in most soil types but prefer well aerated, nutrient rich soils.
Creeping Thistle should not be a problem in regularly mown lawns that are well established. They are more of a problem in newly sown or low maintenance lawns.