This section is from the book "The Florists' Manual", by William Scott. Also available from Amazon: The Florist's Manual.
This is a new section, but they have proved themselves the past winter perfectly hardy. They are as sweet scented as the old English sweet briar and have showy flowers. They are a great addition to our hardy flowering shrubs, and will doubtless be much planted. Like the hybrid perpetuals they can be propagated from the half-ripened wood in sand, or from the matured wood in autumn and winter.