Ranunculus Yellow BulbsRanunculus Tomer Yellow, These sunny yellow ranunculus have lush, rose like flowers and long stems that are perfect for bouquets. Gardeners in Texas, California and other mild climates, can plant ranunculus in the fall for spring flowers. In zones 3 7, the bulbs can be planted in pots and grown in a cool greenhouse. Ranunculus bulbs buttercup plants produce cheery multi petalled flowers. The almost unpronounceable name covers a large group of