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How important are roots on transplanted bulbs?
New roots are grown each year from the bottom of the bulb form the basal plate, and along the underground stem portion. Basal plate roots go deeply into the ground to help anchor bulbs against the effects of high wind, for accessing deeply buried nutrients and ground moisture, and for your plant's long-term health. This "contractile" root system actually pulls bulbs deeper in light soil.
Encouraging the formation of stem roots after transplanting should be your most important, immediate goal. These critical roots need nurtrients within the top 2 or 3 inches of soil - where a top-dressing of fertilizer, compost or well-rotted manure can be placed, and where nature provides nurtrients in the wild.
Wild Lily bulbs making up the genus Lilium belong to the family Liliaceae comprising of approximately 200 genera made up of approximately 2,000 lily species. There are in the neighborhood of 110 to 120 Lilium species depending on whose classification you reference. For the full article, click Knowledge Base