clover

Clover can be killed using any lawn weedkiller that contains the acitve ingredient mecoprop, which most kinds do. Apply it in good growing weather after a fine day or two and with no rain threat, ideally May to August.

Speedwell can be knocked back by using lawn sand or sulpahte of iron as used for moss control, but is difficult to completely control and the normal lawn weedkillers do not give good control.