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Dividing Lily Bulbs
"Some of our lily bulbs have been in the ground (undisturbed) for 3 years, and are quite large (about the size of a large grapefruit). Should they be divided before we re-plant them elsewhere?"
Unless you want them to be elsewhere, the bulbs would be just fine for another year or two in the same spot. Dig and divide when you see multiple stems emerging from the same bulb and the overall height of the stems are significantly shorter. Some springs may be warmer than usual and the bulbs could be naturally shorter that year, so do not worry about the lilies unless they have multiple stems emerging and seem crowded. During transplanting, if they have "split", you will see two distinct bulbs; simply pull them apart from one another.
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