White Spots on Magnolia Bark: Lichens or Algae, Not Disease

Identifying White Raised Spots on Sunsation Magnolia

A fall-planted Sunsation magnolia in Ohio shows white, slightly raised spots on bark. Growth seems slow. These are almost certainly lichens or parasitic algae—both harmless epiphytes.

Why No Action Needed

• They don’t penetrate bark or steal nutrients.
• Common on slow-growing, smooth-barked trees.
• Indicate good air quality.

Magnolia Growth Habit

Magnolias are semi-evergreen with distinct growth flushes: a spring push, then rest. Fall leaf drop before new growth is normal. Fertilize lightly in spring with balanced formula; mulch and water during drought.

Your tree is behaving normally for its species and age.