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These latter species were daily visited by Penstemon specialists (O.
We observed several foliage, floral, and seed feeding insects feeding on blowout penstemon in 2004 and 2005.
Penstemons, on the other hand, are probably more popular now than they have ever been, even prompting Hayloft Plants, based at Pensham near Pershore in Worcestershire, to produce a colourful mail order catalogue devoted to these beautiful and easy-to-please perennials.
Penstemons belong to the family scrophulariaceae, which all seem to be detested by slugs and snails.
This year I chanced my luck and already there are two trays, about 40 plants, of Penstemon heterophyllus 'Heavenly Blue' ready to go into the garden or be potted on again to make chunky plants to use in later summer.
Use hormone rooting powder if you like but, at this time of year, penstemons root incredibly easily.
In late June 1990, first year Penstemon seedlings grown from seed by Prairie Restoration, Inc.
There is a wide range of colours - mostly pinks, reds and purples, though there are even species of penstemon with yellow flowers.
It's a slug-free bed and, although we all know there's no such thing, it has proved there are lots of plants that slugs dislike - including penstemon.
Penstemons, the third resident of the pots, are from the Americas - from Guatemala to Alaska.
Penstemons, however, are quite unusual in having an extended flowering season more akin to a bedding plant than a perennial, beginning in July and continuing through summer into autumn.
Other eye-catching blue kinds include two varieties bred from Penstemon heterophyllus, `Shock Wave' (pictured) and `True Blue', both 45cm (18in) tall.
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- Penstemon barbatus
- Penstemon centranthifolius
- Penstemon cyananthus
- Penstemon davidsonii
- Penstemon deustus
- Penstemon dolius
- Penstemon fruticosus
- Penstemon linarioides
- Penstemon newberryi
- Penstemon palmeri
- Penstemon parryi
- Penstemon puniceus
- Penstemon rupicola
- Penstemon rydbergii
- Penstemon serrulatus
- Penstemon whippleanus