Companion plants for Rock Cress
Rock Cress blooms from April through May. It wants full sun and low water. The 8 companion pairings below each state why the pairing works.
Taking over as Rock Cress finishes

Mullein
Shares full sun and low water; blooms in early summer as this one finishes; stands well above at 4 ft, a canopy to plant beneath; both offer pollinator forage, in different months.

Cosmos
Shares full sun and low water; blooms in early summer as this one finishes; stands well above at 3.5 ft, a canopy to plant beneath; both offer pollinator forage, in different months.

Russian Sage
Shares full sun and low water; blooms in midsummer, extending the bed's season; stands well above at 4 ft, a canopy to plant beneath; both offer pollinator forage, in different months.

Delphinium
Shares full sun and low to moderate water; blooms in early summer as this one finishes; stands well above at 4.5 ft, a canopy to plant beneath; both offer pollinator forage, in different months.

Potentilla
Shares full sun and low water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; taller at 3 ft, for the layer behind it.

Beautyberry
Takes full sun to part sun and low to moderate water; blooms in early summer as this one finishes; stands well above at 5 ft, a canopy to plant beneath; both offer pollinator forage, in different months.

Cleome
Shares full sun and low to moderate water; blooms in early summer as this one finishes; stands well above at 4 ft, a canopy to plant beneath; both offer pollinator forage, in different months.

Oregano
Shares full sun and low water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; taller at 1.5 ft, for the layer behind it.