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 country within the continental U.S. Penstemons are rather loved via rock gardeners, yet as Panayoti Kelaidis issues out in his foreword, they belong in each backyard, considering that "one penstemon or one other will thrive in almost any microclimate a backyard can contrive, from sizzling, barren region exposures to dank shade."
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Example text
Short-term amendments usually break down quickly, and earthworms can bring up alkaline soil from below, spoiling all your initial efforts. The scree formula mentioned earlier is an excellent choice for creating an acid scree in the garden; it should be watered periodically with a weak solution of a water-soluble acidic fertilizer. The combination of alkaline tap water and acidic organic matter such as peat moss is not a pleasant one; the salts resulting from the chemical reactions may well corrode roots and kill plants within a few years.
For these, construction of a scree may be the best approach. The Scree A scree is an area, usually at the base of a cliff or rock outcrop, where small stones have accumulated, sometimes with residual amounts of soil. Here, multitudes of alpine plants find fast-draining homes. The scree can be translated into home garden terminology as being any area where the principal growing medium is small stones, the principal purpose being one of affording quick drainage. Formulas for scree construction vary almost infinitely, as the best mix for a given area will be determined largely by the local rainfall.
I have not found any way to make soil acidic other than by replacing it. Short-term amendments usually break down quickly, and earthworms can bring up alkaline soil from below, spoiling all your initial efforts. The scree formula mentioned earlier is an excellent choice for creating an acid scree in the garden; it should be watered periodically with a weak solution of a water-soluble acidic fertilizer. The combination of alkaline tap water and acidic organic matter such as peat moss is not a pleasant one; the salts resulting from the chemical reactions may well corrode roots and kill plants within a few years.