I planted tulips years ago and they always grew every year. But, the last few years their leaves have been poking out of the ground, but the tulip itself hasn't. What happened, and what do I do?
The bulbs may be too crowded and need dividing. Gently dig up the clump. Separate bulbs and replant six inches apart in all directions. You'll end up with more bulbs and blooms. Also, all bulbs should be fertilized with bone meal and a bit of nitrogen when foliage pushes out of the ground every year. Sprinkle bulb food over the ground just before a rain is expected or water in the fertilizer.
Go for it! Wittle out little holes in your lawn and/or the front edge of flower beds. Pop the bulbs in the holes, pointed side up, and cover with about 1/3 to 1/2 inch of soil. They may bloom, especially the ones that have buds. Foliage will appear on all bulbs, though. Let it ripen (until leaves brown or yellow) before mowing the lawn. Next spring you'll have plenty of crocus!
For me in NH, a sign of spring is seeing the buds on the trees and the sugar houses boiling! Still snow high on the banks, but mud and more mud everywhere else! No crocus yet, but waiting.