Separate them up so they are not touching, dig a hole about 6” deep and drop them in, carefully cover with more compost, they should flower around March time. They are best laid on grit so the bulbs don’t rot.
Gardening on the wild, windy west side of Dartmoor.
I agree, I've always planted 'forced' hyacinths in the ground after they have done their indoor thing. Because forcing them uses up most of their stored resources, they may only produce leaves the first year after being planted in the ground but after that they should flower every year. I have some that still come up every year about 20 years after planting them.
A trowel in the hand is worth a thousand lost under a bush.
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They are best laid on grit so the bulbs don’t rot.