Agave Attenuata Discoloration After Transplant: Sun Scorch or Cultural Issue?

A gardener in Southern California (zone 92692) transplanted a large Agave attenuata from a neighbor's full-sun garden into a large container with well-draining soil amended with rocks. The plant receives similar afternoon sun exposure. Within a day, pale, irregular spots several inches across appeared on a few leaves.

Diagnosis: Sun Scorch Exacerbated by Transplant Stress

Despite unchanged sun exposure, the symptoms match sun scorch. Transplanting disrupts root function, reducing water uptake right when the plant needs it most. The rocks mixed throughout the soil—rather than placed only at the container bottom—may worsen the problem. Larger rocks heat up in sun and can "cook" adjacent roots, while unrinsed rocks may leach salts.

Recommendations

• Repot using rocks only at the bottom for drainage; rinse rocks first to remove salts.
• If fungal infection is suspected, apply a strong fungicide such as chlorothalonil.
• Otherwise, the plant should stabilize as roots re-establish.

Monitor new growth for improvement.