Common Dog-violet

This perennial is the European native Common Dog Violet found in deciduous woodland and hedge banks; the subspecies minor can be found in the open in short grass. It will grow on most soils that are moist but well-drained. Not usually a problem in the garden and would be a welcome addition by most gardeners, unlike the purple-leaved variant which is grown as an ornamental plant and self-seeds freely.
The Common Dog-violet is a primary food source of the caterpillars of many Fratillary butterflies

The heart-shaped, bright green leaves grow in a basal rosette on long stalks.

The unscented flowers are borne on single stems. The lower petal fades to white at its base with dark veins or guide-lines leading to the centre of the flower. The blooming period is from April to June, and sometimes later at the end of summer.

If removal is necessary the fine adventitious roots do not regrow, but ensure that the central tapering one is removed.
Weedkillers to use:-
Glyphosate, systemic action killing the whole plant.

Follow these links for further details on Weeds, Weed Removal and Weed Prevention.