The dead-nettle (lamium) family are distantly related to the stinging nettle. They can be annual or perennial species spreading by seed dispersal and stems rooting. Those cultivars selected for garden use are less invasive than the vigorous perennial, Lamium album. This has white flowers produced in whorls popular with bees. Lamium species are also used as a food plant of many butterflies.
How to get rid of it: Invasive plants can be removed by digging them out with a fork and carefully removing all stem fragments.
Anagallis arvensis is an attractive annual weed of light soils. It spreads by means of dehiscent (bursting open) seed capsules from August to October. Flowers can range from pink to red and blue and lilac.
To get rid of it, pull it up by hand to prevent seeds spreading, or use a contact or residual weedkiller.
This pretty flowering lawn weed has bright blue flowers with four petals and a white centre. It flowers from April to June and its Latin name is Veronica chamaedrys. This creeping plant is an herbaceous perennial that spread by seed and stems, and can reach H50cm.
To get rid of it: consider keeping it, though any general broadleaf lawn weedkiller will remove it.