This section is from the book "The Gardener's Monthly And Horticulturist V18", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
The Gardeners' Chronicle says: "Deutzia gracilis that has been forced through the winter and has done flowering will now be pushing growth. The best way of treating this plant, and by which it may be kept in a healthy, useful condition for a number of years, is to cut out the old wood after it has flowered, depending for next year's bloom upon the young shoots that push up freely from the collar when the plant has plenty of roots. To ensure its blooming satisfactorily every year when forced it should, after flowering, be kept in a little heat, such as a vinery at work, until the growth is made and flower-buds formed. If in small pots give them a moderate shift; if they do not require more room they will whilst growing be benefited by manure-water twice a week or so."