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Avocado Stem Film: Normal Oxidation

A reader’s 13-inch avocado seedling (cut back twice, now 6 inches) has a light grayish/whitish film on the lower, older stem that rubs off but returns.

Verdict

If the film is even and film-like (not patchy), it’s normal oxidation—harmless. Ficus and Schefflera also develop it.

Optional

Wiping with diluted mineral oil and water may slow its return.

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