Sunburn on Golden Barrel and Mexican Fence Post in Phoenix

New Landscape Cacti Yellowing in Extreme Heat

Golden barrel and Mexican fence post planted 2 months ago in Phoenix full sun (110°F shade). Yellowing from top, now pronounced at bottom. Watered 2x, 3 weeks apart.

Diagnosis

Both species poorly suited to extreme low-desert sun; need afternoon shade. Likely sunburn.

Action

• Provide shade immediately.
• If severe, ask landscaper to replace (they should have oriented south side south).