I have for the fourth time this autumn replanted crocus bulbs in my garden.

I had thought that perhaps badgers or foxes were digging up and eating the
bulbs, and therefore placed large metal sheets covering them over + heavy
weights on top, having sprinkled the adjacent ground with methyl nonyl
ketone 'crystals' .

Upon examination today it appeared that a small mouse-sized creature has
burrowed under the metal sheeting , dug out and eaten the bulbs.

I have replanted the bulbs adding mustard powder and scent-off pellets in
with each bulb . . . . . . . . . . . but what is recommended as the most
effective way of rendering the bulbs unappetising to predators ?

Anthony