This section is from the book "The Gardener's Monthly And Horticulturist V21", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
The Deutzias in nurseries are not well understood; the following from the American Agriculturist, is timely, and will help to clear up the confusion :
"The various Deutzias are among my favorite flowering shrubs; I have endeavored to procure all the species and varieties offered by our nurserymen, and the labels said that I had them all. I noticed that there was a close similarity between my D. scabra and D. crenata, but gave them no close examination, until a note in Gray's Garden Botany, to the effect that D. crenata was generally cultivated as D. scabra, induced me to look at them more closely, when I found that all the difference between the two was in the labels, and that I had no D. scabra. I then ordered from some half a dozen different nurseries, plants of D. scabra; they came into bloom this Spring, and every one is D. crenata. It is very doubtful if D. scabra is in any of our nurseries; at any rate, if the real thing is to be had, I should like to know it. According to the engravings in Siebold and Zuccarini's Flora of Japan, D. scabra has narrower and much rougher leaves than D. crenata, but the marked distinction is in the stamens; in the former (scabra) the filament, or stalk portion of the stamen, is broadest below, and tapers upwards, while in the other the filament is broadest above, with two blunt lobes just below the anther.
This is by no means the only case which a plant has been sent out year after year under a wrong name, and cultivators abroad frequently complain that it is impossible to find certain plants in the trade, as some other has been, no doubt accidentally, substituted, and the error propagated not only from nursery to nursery, but from one country to another. Now that Deutzias are the topic, let me remind you that too much cannot be said in favor of the slender one, Deutzia gracilis, as it is far from being generally known. It is seldom higher than two feet, forms a handsome clump with gracefully recurved branches, and in June is covered with flowers as white as snow-flakes. I sometimes think if this, and many other choice shrubs, were fitted with some easy-going English name, it would do much to popularize them. It is a choice shrub for any garden, and is admirably suited for cemetery planting. Our florists know its value for forcing, and it is one of the hardy things that may be forced without a greenhouse. When frost has checked the growth, the plants may be taken up and potted: keep them in a cool cellar or frame until February, then bring them to a sunny window, and they will come forward, if not so rapidly as in a greenhouse, quite satisfactorily.
It is easily propagated from cuttings, or from the suckers which it produces in abundance".