Trilliums are among some of the most attractive spring wildflowers. Preferring rich, loamy soil in shady conditions the natural reproduction of trilliums does not seem to be especially prolific (it takes seven years for them to flower from seeding) so it is important to practice conservation with these beautiful flowers. In transplanting trilliums, cover the tuber-like rhizome with at least two inches of soil. Space plants about ten inches apart and be sure to water them in dry weather. Trilliums thrive in soil with lots of organic matter, and where the pH is neutral or slightly acid.