Just because the flowers are gone doesn't mean your work is done. In fact, taking care of your crocus plants after they've flowered is essential for ensuring a stunning display next season.
Crocus 3 main growth cycles1. Growth and flowering2. Post flowering3. Dormancy
Aim to keep the soil consistently moist but not soggy during the active growth period. They require less water after they've finished flowering, but don't let the soil dry out completely.
During dormancy apply a layer of organic mulch, like shredded leaves or bark, over the resting bulbs. This helps insulate the corms over the winter, conserves soil moisture, and suppresses weeds