When and how transplant muscari / grape hyacinths?
I was given some grape hyacinths that were forced indoors. I'd like to plant them outside so they would (hopefully) bloom for us next year.
When is the best time to do so? What is the proper way to do it?
The "proper" approach is to let the bulbs grow and stay green where they are, then naturally brown and go dormant. That should take a month or so. Then the bulbs should be stored over the summer and planted in fall, which is the normal time to plant spring-flowering bulbs. There is more detail, including depth, on this webpage: http://www.extension.umn.edu/garden/yard-garden/flowers/spring-flowering-bulbs/
The common variety grape hyacinth is a tough bulb. If you can't store them over the summer or must plant them outdoors before the foliage has browned, there is a good chance they will survive. Try to disturb the roots as little as possible when you plant.
Here is our website page on bulbs: http://extension.umd.edu/hgic/flowers/bulbs