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Penstemon is a native North American perennial herbaceous plant with a showy display of flowers.Penstemons are valuable garden plants, grown for their long-flowering season and popularity with bees. There are many different types of penstemon, with some suited to the alpine garden while the majority are at home in the heart of a herbaceous border. Border penstemons have tubular late summer flowers in a wide range of colours. The flowers look very similar to those of a foxglove.
John Mitchell published the first scientific description in 1748; although he only named it as Penstemon, we can identify it as P. laevigatus. Linnaeus then included it in his 1753 publication, as Chelone pentstemon, altering the spelling to better correspond to the notion that the name referred to the unusual fifth stamen (Greek "penta-", five). Mitchell's work was reprinted in 1769, continuing with his original spelling, and this was ultimately accepted as the official form, although Pentstemon continued in use into the 20th century.By 1860, a half-dozen French growers are known to have developed hybrids, most notably Victor Lemoine, while in 1857 the German Wilhelm Pfitzer listed 24 varieties. In 1861 the British Royal Horticultural Society held trials in which 78 varieties were entered.
The Scottish firm of John Forbes first offered penstemons in 1870, eventually becoming the biggest grower in the world; in 1884 their catalog listed 180 varieties. By 1900 Forbes had offered 550 varieties, while Lemoine had developed nearly 470 by the time of his death in 1911. Few of these have survived to the present day.The plantain family (Plantaginaceae) gifts us with some wonderful ornamental flowering plants, including snapdragons, foxglove, and the valuable Penstemon genus, which contains more than 250 beardtongue species ready to grow in your garden. Penstemon plants are herbaceous perennials that feature lance-shaped foliage and spikes of tubular flowers. Flower colors include pink, red, white, purple, and (rarely) yellow. The nickname of bearded tongue refers to the pollen-free stamen that protrudes from the flower, resembling a bearded iris in this aspect. This perennial is easy to grow from seeds planted in spring to early summer. It's somewhat slow to start and needs 10 to 21 days to germinate. (Source:www.thespruce.com)