Hesperis matronalis, Brassicaceae
Walking along the river Clyde in Glasgow you can see some large colonies of the biennial sweet or dame’s rocket towering over grasses and other herbaceus plants, in different shades from white to purple. Originally from continental Europe and northern Asia, the plant has naturalised in many parts of the world, including the British Isles and North America, where it was brought over during the XVII century.
As often happens, showy ornamental plants end up colonising new land as garden escapees, but aside from being tall and pretty, sweet rocket is also another great, low maintenance, sweetly-scented wildflower which happens to attract bees and especially butterflies and easily self-sow creating lasting colonies. Moreover, the young leaves, rich in vitamin C, are edible and quite spicy and tangy, as you can expect from a Brassicacea (member of the family which gives us mustard and cabbage), so they are great as a salad addition just as regular rocket.
Double flowered cultivars of the plant exist and are beautiful, but in general I like simple, plainly accessible blossoms, because what’s the point in a wildflower an insect can’t forage anymore? If you didn’t know, in many double flowers most of the reproductive organs are mutated into additional petals, or the access to the nectaries is simply blocked, making the flower less valuable in a wildflife-friendly garden!
Other Brassicaceae I wrote about are Cardamine pratensis or the cuckooflower, Raphanus raphanistrum or wild radish, Brassica oleraceae acephala and Brassica rapa var. rapa, or kale and turnip.