More than 400 species of buttercups exist worldwide with different species growing best in different climates. The trick to planting buttercups is to find a species that is acclimated to your particular growing region, anywhere from the tip of Florida to the northern regions of Minnesota, and concentrate on growing that species in your garden.
Plant in early spring after all danger of frost has passed. Prepare your garden by turning approximately 8 inches of top soil with your spade to break up and loosen the soil. Add approximately 50 percent mulch to the loosened soil and mix it in well with your spade. Choose an area that gets some sun but is also partly shaded during the day.
Dig down with your hands or a spade and plant your buttercups so the roots are completely covered by soil. Set your plants 4 to 6 inches apart as they will quickly spread and fill in.
Sprinkle mulch over the top of the soil around each plant to help hold in moisture. Water the area thoroughly with a sprinkler but do not soak.
Keep the ground moist but do not over water. Buttercups like cool, moist soil.