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

Gazania
Shares full sun and low water; blooms in early summer as this one finishes; lower at 10 in, for the front of the border; both offer pollinator forage, in different months.

Blanket Flower
Shares full sun and low water; blooms in early summer as this one finishes; both are strong pollinator plants, and they feed in different months; lower at 1.5 ft, for the front of the border.

Lantana
Shares full sun and low water; blooms in early summer as this one finishes; both are strong pollinator plants, and they feed in different months; lower at 1.5 ft, for the front of the border.

Vinca
Shares full sun and low water; blooms in early summer as this one finishes; both are strong pollinator plants, and they feed in different months; lower at 12 in, for the front of the border.

Toyon
Shares full sun and low water; blooms in early summer as this one finishes; both are strong pollinator plants, and they feed in different months; taller at 13 ft, for the layer behind it.

Chocolate Flower
Shares full sun and low water; overlaps, then carries the display into mid fall; both are strong pollinator plants; lower at 1.5 ft, for the front of the border.

Adam's Needle
Shares full sun and low water; blooms in early summer as this one finishes; both are strong pollinator plants, and they feed in different months; lower at 2.5 ft, for the front of the border.

Common Blue Grama Grass
Shares full sun and low water; blooms in early summer as this one finishes; both are strong pollinator plants, and they feed in different months; lower at 1.5 ft, for the front of the border.