Ranunculus sardous

Hairy buttercup is a weed in the Ranunculaceae (buttercup) family native to the Canary Islands, North Africa, and Europe.  This broadleaf, winter annual germinates in the fall or winter and remains dormant until spring.  However warm weather in winter may trigger growth.   It thrives in disturbed areas, particularly in moist ones and has dense fibrous roots. 

It has ascending to erect form and very hairy leaves and stems, hence the common name.  It matures and produces seed in the spring dying back in late spring or early summer. It can quickly out compete weak turf, particularly where the soil is moist or in shade.

The yellow, five petaled, flowers have five reflexed sepals. Each petal is usually less than a third of an inch long. The petioles are often over an inch long attaching the hairy stem to the hairy leaves which are usually divided into three leaflets.  The achene fruits grow in clusters of up to 35.

Healthy turf is the best way to prevent winter annual weeds. Select a variety adapted to your area and fertilize, mow, and water at recommended rates. The low, broad growth habit is not hampered by mowing so weed management strategies may be needed.