Healthy ranunculus plants are prolific bloomers. There's not much to dislike about these easy-care plants, which typically flower earlier than most other summer-blooming gardening specimens. The bonus is that they're undemanding and relatively maintenance-free. Ranunculus begin blooming by mid-March or early April. By providing appropriate care, it's not difficult to extend the blooming season of your ranunculus.
Add 2 or 3 inches of composted manure to your ranunculus bed early in the spring and cultivate it into the topsoil to a depth if about 9 to 12 inches. This will encourage more uniform flowering.
Water your ranunculus about once every two weeks in the absence of rainfall throughout the growing season. Soil should remain evenly barely moist, but never soggy or wet.
Feed your ranunculus 5-10-10 fertilizer for blooming plants every six weeks throughout the growing season. Follow the packaging instructions carefully. Well-fed ranunculus plants are far more likely to bloom prolifically and for an extended period of time than those that are neglected.
Deadhead ranunculus as soon as flowers wilt and begin to drop petals. This is the single most effective action for extending the blooming period.