L. H. Bailey,
The Nursery-Book: A Complete Guide to the Multiplication and Pollination of Plants
“ In making cuttings from soft and growing shoots, the first thing to learn is the proper texture or age of shoot. A very soft and flabby cutting does not grow readily, or if it does it is particularly liable to damp-off, and it usually makes a weak plant. Too old wood is slow to root, makes a poor plant and is handled with difficulty in many species. ”
