By Robert Nold
With a few 270 species, Penstemon is the biggest genus endemic to North the US, with examples to be present in each nation within the continental U.S. Penstemons are really loved by way of rock gardeners, yet as Panayoti Kelaidis issues out in his foreword, they belong in each backyard, seeing that "one penstemon or one other will thrive in almost any microclimate a backyard can contrive, from scorching, wasteland exposures to dank shade."
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The acid fertilizer is important, especially if your tap water is alkaline, as the chemical reaction between acidic peat moss and alkaline tap water may result in root corrosion. Crevice gardening requires a lot of work. This will translate, for most people, into a lot of time and a lot of money. The results are so attractive, though, that you may find it worthwhile to devote a Page 34 small portion of the rock garden to a crevice garden. This is an ideal home for many of the more difficult alpine penstemons, including the sometimes recalcitrant Penstemon harbourii.
Harbourii. Some of the smaller Dasanthera penstemons make excellent trough plants; I am growing Penstemon rupicola 'Myrtle Hebert', P. davidsonii var. davidsonii 'Mt. Adams Dwarf', and others in a trough. Troughs for dryland penstemons can contain soil mixes similar to those receiving regular watering. You will need to make sure the soil does not dry out completely; mulching with stone chips will help. Some of the more difficult dryland plants can be grown in troughs, such as Penstemon acaulis and its variety yampaënsis, P.
Proponents of these methods consistently fail to explain how the biology of plants can be altered by soil amendments and supplemental irrigation (see Weinstein 1986). Matching the soil and moisture requirements to the plants seems to me to be the best idea. Drought-tolerant plants want to be dry; they are not would-be mesophytes yearning for the "chocolate-cake" soil of most gardens. The Mythical "Well-Drained Soil" Few penstemons in the wild grow in soils containing noticeable amounts of organic matter.