Ripening fruit gives off a gas that can damage the developing bulb flower. When the cold period is over, move the pots to a warmer area in indirect or low light. The Holiday Hyacinth, A Special Treat Of all bulbs that need cold treatment, hyacinths are special. The pre-cooling process trims about two weeks off the time needed for the bulbs to flower. This makes it possible to have hyacinths for the holidays if you begin by late September.
Hyacinths are also special because they can be grown without any soil or gravel.
The growing roots, which can be seen clearly through the glass, add a special interest. Whether you buy them professionally forced as a last minute gift, or make them your special holiday project, forced bulbs are thoughtful and appreciated holiday gifts that keep on growing, brightening the dark days of winter for weeks on end.