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

False Indigo
Takes full sun to part sun and low to moderate water; blooms in late spring as this one finishes; leafs out to hide the ripening bulb foliage as it dies back; its seed heads stand through winter, for structure and the birds; they only overlap in zones 8 to 9.

Pampas Grass
Takes full sun to part sun and low to moderate water; blooms in late summer, extending the bed's season; its seed heads stand through winter, for structure and the birds; taller at 8 ft, for the layer behind it.

Sweet William
Takes full sun to part sun and moderate water; blooms in late spring as this one finishes; leafs out to hide the ripening bulb foliage as it dies back; pink sits close to red on the wheel; they only overlap in zones 8 to 9.

Gardenia
Shares part sun and moderate to high water; blooms in late spring as this one finishes; evergreen, so the bed keeps its shape through winter; taller at 4 ft, for the layer behind it.

Feather Reed Grass
Takes full sun to part sun and moderate water; blooms in early summer, extending the bed's season; its seed heads stand through winter, for structure and the birds; taller at 5 ft, for the layer behind it; they only overlap in zones 8 to 9.
Blooming alongside

Agave
Takes full sun to part sun and low to moderate water; leafs out to hide the ripening bulb foliage as it dies back; evergreen, so the bed keeps its shape through winter.

Japanese Forest Grass
Takes part sun to 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; they only overlap in zones 8 to 9.

Autumn Fern
Takes part sun to 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; they only overlap in zones 8 to 9.