Before purchasing, it is crucial to understand that Ranunculus asiaticus is typically propagated from corms, which are underground storage organs. A corm is a swollen stem base that is botanically distinct from a true bulb. It stores energy for the plant's growth cycle. Purchasing a healthy, plump, and firm corm is the most common and economical way to grow ranunculus, as it allows you to control the entire growth process from dormancy to spectacular bloom. Alternatively, you can buy pre-started plants in pots, which offer a head start but are less common and often more expensive. The focus for a serious gardener should be on sourcing high-quality corms.
From a horticultural perspective, a viable ranunculus corm must exhibit specific physiological traits to ensure successful growth. Do not purchase corms that are soft, mushy, shriveled, or show signs of mold or visible damage. These are indicators of rot, disease, or desiccation, which will lead to plant failure. A healthy corm should be firm to the touch, have a plump and rounded shape resembling a small octopus or a claw, and be of a substantial size. Larger corms generally contain more stored energy and will produce more robust plants with a greater number of flowers. The corm's exterior should be dry and intact.
For the highest quality and selection, specialized online bulb nurseries are often the best bet. These companies source their plant material carefully and often pre-sprout corms to verify viability. Reputable sources include: - **Longfield Gardens**: Known for high-quality bulbs and corms, they offer a wide variety of ranunculus colors and provide excellent planting guides. - **Eden Brothers**: A major flower bulb and seed retailer with an extensive selection of ranunculus corms, including mixed color collections and specific hues. - **Floret Flowers**: A renowned farm specializing in cut flowers, Floret offers elite, field-tested ranunculus varieties known for their performance, though availability can be limited. For pre-started plants, local specialty nurseries and garden centers are your best option in the spring. Always inspect the plants for vibrant green foliage, no signs of insect pests (like aphids), and a well-established root system that is not pot-bound.
The success of your ranunculus is not solely dependent on the purchase point but also on proper subsequent care. Ranunculus are cool-season plants that thrive in well-draining soil and full sun. In most of the US, corms are planted in either the fall (USDA zones 8-10) or early spring after the last frost (zones 4-7). They require a period of pre-sprouting or soaking before planting to rehydrate. Soak the corms in room temperature water for 3-4 hours before planting them with the "claws" facing down. Ensuring proper soil drainage is the single most critical factor to prevent corm rot, a common fungal issue. Amend heavy clay soils with compost or plant in raised beds.
