When can I remove tulip foliage?

Question: 

When can I remove tulip foliage?

Answer: 

Tulip foliage should not be removed until it has turned brown and died.  The length of time it takes the foliage to die back depends on bulb type, weather, and other factors.  The foliage of most tulips usually doesn’t die back until late June or early July.  The foliage of tulips and other spring-flowering bulbs is performing a vital function.  It is manufacturing food for the underground bulbs.  Premature removal of the plant foliage reduces plant vigor and bulb size, resulting in fewer flowers next spring.  After the foliage has turned brown, it can be safely cut off at ground level and discarded.  

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