Answer: Tulips can be transplanted during active growth if you are careful to take a large rootball with them, including not only the bulb but also the roots growing from the bottom of it. Prepare the planting area ahead of time, and water the tulips the day before you dig them. Then move them, replanting immediately, and water them in well to settle the soil. With any luck, they'll never know they have been moved. You can also allow them to mature in place, then lift them and store them dry at room temperature for the summer, and replant in the fall. If you do this, make sure they are stored in one single layer in a location with good air circulation (a screen shelf or wire rack is good for this) and check them periodically for rot.
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