Answer: You might be seeing damage by voles, they will dig under the soil and eat the bulbs. You could try using one of the (granular or liquid) repellents marked for rodents along with wire mesh laid on the soil surface to surround the bulb and prevent them digging down to it. You could also make sure the mulch is not overly thick in that area of the garden to discourage them approaching. Sometimes when the population is heavy, gardeners end up having to enclose the bulbs in cages of wire mesh underground or surround the bulbs with sharp gravel or flaked rock. You could also consider trapping the voles. I hope this helps.
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