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

Color Guard Yucca
Shares full sun and moderate water; blooms in early summer 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.

Red Yucca
Shares full sun and low to moderate water; leafs out to hide the ripening bulb foliage as it dies back; blooms in midsummer, extending the bed's season; both are strong pollinator plants, and they feed in different months.

Parry's Agave
Shares full sun and low to moderate water; blooms in early summer 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.

Common Blue Grama Grass
Shares full sun and low to moderate water; blooms in early summer 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.

Feather Reed Grass
Shares full sun and moderate water; blooms in early summer 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; they only overlap in zones 8 to 9.

Splitbeard Bluestem
Shares full sun and low to moderate water; blooms in late summer, extending the bed's season; both are strong pollinator plants, and they feed in different months; its seed heads stand through winter, for structure and the birds.

Toyon
Shares full sun and low to moderate water; blooms in early summer as this one finishes; both are strong pollinator plants, and they feed in different months; evergreen, so the bed keeps its shape through winter.

Austin Pretty Limits Oleander
Shares full sun and moderate water; blooms in midsummer, extending the bed's season; both are strong pollinator plants, and they feed in different months; evergreen, so the bed keeps its shape through winter.