Hyacinth bulbs are planted in the fall and bloom in the spring. Hereââ¬â¢s a guide to planting and growing hyacinths and grape hyacinths in your home and garden! About Hyacinths and Grape Hyacinths. ... Hyacinth bulbs may be forced into early growth for indoor display in the winter. Plant them with the tips just showing, in soil-based potting mix in containers with drainage holes. Keep in a dark place at temperatures above freezing but no higher than 45ðF 7ðC, for at least 10 weeks to allow roots to develop. When shoots are about 1 inch long, increase light and temperature gradually.
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