Compared to some countries (the United States and South Africa, for instance) our native flora is modest both in numbers and appearance, but there are still many garden-worthy plants.
Obviously, none of the following should be dug up from the wild. They may be bought as young plants, or as seed.
Seakale (Crambe maritima): needs fertile, well-drained soil in full sun
Foxglove (Digitalis purpurea): woodland garden or wild border
Teasel (Dipsacus fullonum): wild border or dotted around garden
Rough horsetail, (Equisetum hyemale): also known as scouring rush because it was once used for cleaning pots. Related to the pernicious weed, common horsetail (Equisetum arvense), but not as invasive. Grow in a pot, for safety. Has slim, elegant metre-long stems with black nodes
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Hemp agrimony (Eupatorium cannabinum): wild border or pond side
Bloody cranesbill (Geranium sanguineum): well-drained soil at front of border, or rockery
Ragged robin (Lychnis flos-cuculi): damp soil
Mullein (Verbascum thapsus): well-drained soil in wild or gravel garden