This section is from the book "The Gardener's Monthly And Horticulturist V20", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
These are two of the most beautiful flowering: shrubs of California, and are found on the summits of the low hills to the north of the bay of Monterey, generally among other shrubbery, but in the shade.
The former is deciduous, the latter evergreen; the former bearing large masses of sweet-scented white flowers which are often shaded with yellow and rarely with pink, growing in rather dry ground it sends down large deep roots, which supply it with abundant moisture, though blooming in a rainless Summer. It sends up numerous shoots from a knotty root crown, and from its appearance would seem to be hard to transplant. My experience, however, is to the contrary; for, after hacking a plant to pieces with an axe, I managed to get a few stems, each with a chunk of the crown and a stray rootlet, and after being carried two days on horseback, they were potted in old cans; now, a year afterward, they have filled their cans with a mass of fine roots, and having just shed their leaves, show a fine lot of buds for next year.
The Pickeringia blooms similarly to Swainsonia, but the flowers are much brighter and the racemes longer. I believe it blooms six months in the year, and where it does well is very handsome, often growing eight feet high; its leaflets are about the size of those of the Clianthus and are glaucous green, the stem is beset with thorns, and if the plant would submit to trimming, would make a fine hedge. I have been able to find but three seeds in several years experience with the plant, though as its immense truncate roots seem to sprout freely wherever they are exposed, I presume it might be propagated by the root.