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.
Cytisus Laburnum.
Common Broad-leafed Laburnum; Narrow-leafed long-spiked Laburnum; Short-spiked Laburnum; Variegated-leafed Laburnum, and Middle-sized Laburnum (C. L. intermedium). The first two of which varieties are tolerably permanent from seed, but the other two must be continued by cuttings.
The seed grows freely in the open ground, and should be sown in March, in four-feet beds, drilling it in half an inch deep; they will come up in six or seven weeks. Keep them weeded during summer; and in spring following the seedlings in general, if they stand very close, may be transplanted into the nursery in rows, two feet distance, allowing them more room as they advance in growth; and here they may remain two, three, or four years, till large enough for the shrubbery.
October or November is the best time for planting them. Choose young shoots eight, ten, or twelve inches long; plant them in rows, a foot apart, and five or six inches in the lines; and they will be rooted in one year.
All the culture these plants require in the nursery, is to keep them clear from weeds, and to hoe frequently the ground between the rows. - Abercrom-bie.
 
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