You can often see blackbirds chopping up crocus blossoms. This is related to the search for food for the offspring. One solution would be tinfoil.
Blackbirds have a strange occupation during the crocus bloom. It is not uncommon to see them cutting upthe crocus blossoms downright . An explanation for this behavior is sought in the assumption that the blackbirds want to feed their young, which has just hatched, with the colored juice, which is the guide to the nectar.
To achieve this, they want to feed the calyxes to their offspring.
Solution 1: Tin foil
If you want to protect your crocuses from songbird attacks, you can try to get rid of the pests with tinfoil paper. The ribbons flapping in the wind keep many birds away - not just the destructive blackbird.
Solution 2: mason jars
An alternative is that very large mason jars are placed over the clumps and then provide them with sufficient sunlight as well as protection from the destructive blackbirds.
Each hobby gardener decides individually whether these solutions are optically acceptable. Changing to a different variety of crocus can also make sense, although all solutions have in common that they give no guarantee of success against the destruction of the blackbirds.