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

Carolina Jessamine
Takes full sun to part sun and moderate to high water; blooms in late winter, before this one opens; climbs to 15 ft behind it, height without the footprint; a soft color beside the white.

Bayside Bonito Southern Wax Myrtle
Takes full sun to part sun and moderate to high water; blooms in early spring, before this one opens; taller at 11 ft, for the layer behind it; a soft color beside the white.

Amaryllis
Shares part sun and moderate to high water; blooms in early spring, before this one opens; lower at 1.5 ft, for the front of the border; a soft color beside the white.
Taking over as Gardenia finishes

Redwood Sorrel
Takes part sun to part shade and moderate to high water; lower at 8 in, for the front of the border; overlaps, then carries the display into early fall; its white flowers settle the white.

Cup and Saucer Vine
Takes full sun to part sun and moderate to high water; blooms in late summer as this one finishes; climbs to 15 ft behind it, height without the footprint; a soft color beside the white.

Wishbone Flower
Takes part sun to part shade and moderate to high water; lower at 10 in, for the front of the border; overlaps, then carries the display into early fall; a soft color beside the white.
Blooming alongside

Primrose
Takes part sun to part shade and moderate to high water; opens in early spring and overlaps into this one's season; lower at 8 in, for the front of the border; a soft color beside the white.

Pansy
Shares part sun and moderate to high water; lower at 8 in, for the front of the border; opens in early spring and overlaps into this one's season; a soft color beside the white.