All-year round this little annual wildflower can be found growing in gardens, on tracks, cracks in pavements and on arable land. Its 4-petalled white flowers (2-3mm across) are borne in terminal clusters on stiff stalks rising to about 35cm from a basal rosette. The lanceolate leaves vary from lobed to entire. It is easily distinguished from other members of the family Brassicaceae by its distinctive seedpods which are green and triangular with a notch at the top giving it a heart-shape. This is a native plant which is widespread throughout Ireland.
I first identified this plant growing in Dalkey, Co Dublin in 1977 and photographed it there in 2009
If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre