Ranunculus are popular ornamental flowers that Bay Area Landscape Pros and their clients love for their large and brightly colored, red, orange, yellow, pink, and white flowers. These Bedding Plant staples feature tough roots and can be regarded as weeds by some Landscape Pros and gardeners. Ranunculus usually flower in the spring and they can continue blooming throughout the summer season in the right areas. They prefer sandy or loamy soil that has good drainage and slightly acidic soil.