On 19 Aug 2004 16:30:02 -0700, (Ted Shoemaker)
wrote:

Hello,

I live in Madison, Wisconsin, USA (zone 4 or 5). We have some tulips
that have been growing for 3 or 4 years now, and they are getting
crowded. How and when do I separate them?

Any time after the foliage has died back is good for digging/dividing.
Just dig carefully, break the bulbs apart, and re-plant with a little
bulb food of your choice. How lucky you are to have tulips that
multiply instead of disappearing!