I would definitely say that bloodroot is desirable. Although the flowers tend to be short-lived, only lasting a day or so, more flowers follow for about 2-3 weeks. Their foliage is very pretty and it sticks around a little later than most spring ephermerals. Bloodroots like deciduous shade, with full or part sun in spring and subsequent summer shade cast by trees and shrubs. They also like a moist, woodsy soil, on the acidic side.
Bloodroot can be propagated from seed. But you have to watch the seed pods carefully--they spring open and shoot the seeds everywhere. You might try tying a piece of cheesecloth over the ripening seed pod. To germinate them see Harry R. Phillips "Growing and Propagating Wildflowers".
It can also be divided since it grows from rhizomes. It is slow to establish, but it will form eventually a large clump (1-2 feet across).
Bloodroot can be propagated both by seed and division. You can rely on self sowing which is aided by ants which carry the seeds off. (I have some growing out of my stone wall.) Or you can just scatter the seed in either prepared beds or among the leaves and debris on your forest floor. Although individual flowers last only a few days, if you have some growing from sunny spots to deep shade, you can get three to four weeks of bloom. In 30 years my three plants or so have multiplied to at least three thousand and I have probably given away at least that many. Even nicer than the type is Sanguinaria canadensis flora-plena, a double form which looks like a small white peony. It is sterile so the flowers last a week or longer.
Both the single and double can be easily divided either spring, summer or fall by simply breaking the rhizome being sure that each piece has at least one eye. I believe that they should be dug up, divided and replanted on a regular basis or they will go into a decline.
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