When is the best time to divide my Tulip bulbs? I have had some red ones in the ground for a long time, could be 8 or so years. They are really thick and I was thinking that maybe they should be thinned out some. I just don't know the best time to do it. Thanks for any advice you can give me.

They should be dug when the foliage has yellowed and died. Also the bulbs should have developed a brownish tunic (outer skin). If the bulbs look light in color with a poorly developed tunic it usually is a bit early to dig.

This will give you the optimal quality and these bulbs will be excellent to dry and store for autumn planting as well, if that is your plan.

Thanks William, I will wait until the foliage dries up and then I will dig them and see what the bulbs look like.