This section is from the book "The American Garden Vol. XI", by L. H. Bailey. Also available from Amazon: American Horticultural Society A to Z Encyclopedia of Garden Plants.
Many of the native plants offered by dealers do not appear to be grown in the nursery. In some cases the demand is so limited that it does not pay grow them, especially when they grow wild near at hand. In other cases, on the contrary, the demand is sometimes so great that sufficient stock can not be kept under culture readily, particularly in those cases in which the demand is somewhat uncertain. But there are other plants for which there is a steady demand which are still dug in the woods by some nurserymen. These wild plants are nearly al-ways poorer than the nursery-grown specimens, being old, rough, and untidy. Never having been cultivated or transplanted, they are not so apt to live. Then they are bulky and make excessive freight charges. We recently ordered so common a plant as Clethra alnifolia from a reputable firm, but got wild plants, good ones to be sure, but the express, although the distance was comparatively short, amounted to more than the plants were worth. We believe in nursery-grown stock.
 
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