This section is from the book "A Dictionary Of Modern Gardening", by George William Johnson, David Landreth. Also available from Amazon: The Winter Harvest Handbook: Year Round Vegetable Production Using Deep Organic Techniques and Unheated Greenhouses.
Paulounia imperialis, is a hardy tree, though, until its habits are better tested, it is advisable to plant it in a sheltered situation. Mr. G. Bishop, gardener at the Chiswick Gardens, states that - "It may be propagated by cuttings, particularly if the young shoots are selected when they have advanced to about three or four inches in length; also by eyes, in the same manner as the vine; as well as by divisions of the roots, the smallest particle of them generating adventitious buds. The best time to propagate it is when the plants commence their spring growth. Both eyes and roots should be potted in soil consisting of leaf mould, peat, and sand, in equal proportions, and the pots containing them plunged in a dung-bed. Any other fermenting material would answer the same purpose, where the atmospheric temperature averages from 75° to S0°. Divisions of the root in particular will emit shoots at the expiration of three weeks at the farthest.': - Gard. Chron.
For a drawing and interesting article on this recently introduced tree, see the "Horticulturist".
 
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