Identifying Groundsel (Senecio vulgaris)
Height x spread: 8-45 x 20cm (3-18 x 8in).
Leaves: Dark green, long and fairly narrow, irregularly lobed and toothed.
Flowers: Rich yellow, 4mm (3/8in) across, like tiny thistles in shape, any time of year.
Other features: Germinate any time of year. Stems succulent. Fruits fluffy. Annual.