Companion plants for Foxglove
Foxglove blooms from May through July. It wants part shade and moderate water. The 8 companion pairings below each state why the pairing works.
Blooming before Foxglove opens

Hellebore
Shares part shade and moderate water; blooms in late winter, before this one opens; both offer pollinator forage, in different months; evergreen, so the bed keeps its shape through winter.

Snowdrop
Shares part shade and moderate water; blooms in late winter, before this one opens; low at 5 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.

Windflower
Takes part sun to part shade and moderate water; blooms in early spring, before this one opens; low at 6 in, to carpet the ground beneath; both are strong pollinator plants, and they feed in different months.

Eastern Redbud
Takes part sun to part shade and moderate water; blooms in mid spring, before this one opens; both are strong pollinator plants, and they feed in different months; taller at 23 ft, for the layer behind it.
Taking over as Foxglove finishes

Turtlehead
Takes part sun to part shade and moderate to high water; blooms in late summer as this one finishes; both are strong pollinator plants, and they feed in different months; lower at 3 ft, for the front of the border.

Wishbone Flower
Shares part shade and moderate water; lower at 10 in, for the front of the border; overlaps, then carries the display into early fall; both are strong pollinator plants.
Blooming alongside

Primrose
Shares part shade and moderate water; opens in early spring and overlaps into this one's season; lower at 8 in, for the front of the border; both offer pollinator forage.

Flowering Dogwood
Shares part shade and moderate water; opens in mid spring and overlaps into this one's season; both are strong pollinator plants; taller at 23 ft, for the layer behind it.