Companion plants for Snowdrop
Snowdrop blooms from February through March. It wants part shade and moderate water. The 8 companion pairings below each state why the pairing works.
Taking over as Snowdrop finishes

Columbine
Shares part shade and moderate water; blooms in mid spring as this one finishes; leafs out to hide the ripening bulb foliage as it dies back; both are strong pollinator plants, and they feed in different months.

Foam Flower
Shares part shade and moderate water; blooms in mid spring as this one finishes; leafs out to hide the ripening bulb foliage as it dies back; both offer pollinator forage, in different months.

Virginia Bluebells
Shares part shade and moderate water; blooms in mid spring as this one finishes; leafs out to hide the ripening bulb foliage as it dies back; both offer pollinator forage, in different months.

Azalea
Shares part shade and moderate water; blooms in mid spring as this one finishes; stands well above at 4 ft, a canopy to plant beneath; both are strong pollinator plants, and they feed in different months.

Northern Sea Oats
Shares part shade and moderate water; blooms in midsummer, extending the bed's season; stands well above at 3.5 ft, a canopy to plant beneath; its seed heads stand through winter, for structure and the birds.
Blooming alongside

Christmas Fern
Takes part shade to full shade and moderate water; leafs out to hide the ripening bulb foliage as it dies back; evergreen, so the bed keeps its shape through winter; taller at 1.5 ft, for the layer behind it.

Autumn Fern
Shares part shade and moderate water; leafs out to hide the ripening bulb foliage as it dies back; evergreen, so the bed keeps its shape through winter; taller at 1.5 ft, for the layer behind it.

Japanese Forest Grass
Shares part shade and moderate water; leafs out to hide the ripening bulb foliage as it dies back; its seed heads stand through winter, for structure and the birds; taller at 1.5 ft, for the layer behind it.