White Agapanthus sends up tall, leafless stems topped with a loose globe of star-shaped white flowers over strappy, deep-green foliage — a clean, architectural contrast to the more common blue forms. Established clumps flower reliably through summer with almost no fuss.
It is a fleshy-rooted perennial, not reliably winter hardy below the mid-70s zone range; in marginal zones grow it in a large container that can be moved, or mulch heavily and accept some risk. It can naturalize and self-seed in mild, coastal climates — deadhead spent stalks if that's a concern nearby.
Root rot
Plants wilt, yellow, and stunt even in moist soil; lower stems and roots turn brown, soft, and mushy and the plant may collapse. Most common in heavy, wet, or poorly drained ground.
Improve drainage and stop overwatering, and never plant too deep. Lift and destroy badly affected plants along with the soil around the roots. Grow in raised or free-draining beds to prevent it returning.
Slug and Snail Damage
Deroceras reticulatum →Large irregular holes chewed in leaves, with slime trails on foliage and soil.
Hand-pick at night, set beer traps, or apply iron phosphate bait. Remove debris and mulch where they hide.