The 'Dutch' crocus are hybrids of Crocus vernus and from which much selection has taken place to provide the varieties on offer. These are larger bulbs which can be planted deeper in thicker grass than the smaller 'normal' crocus bulbs. This makes them safer from squirrels and mice. Flowering at 5" (12cm) tall in late February and early March well into the daffodil season they can be an effective foil for the sea of yellow in the March garden.
Plant them 3"(7.5cm) apart and work on about 15 per square foot.