University of Maryland Extension

Adventitious Roots - Vegetables

adventitious roots on tomato stem

Bumps on tomato stems

Tomato plants, particularly heirloom varieties, and tomatillos may produce small growths with short, fleshy, bristles. These are adventitious roots or aerial roots which would grow into normal roots if placed in contact with the soil. The degree to which a gardener will see this is determined by cultivar, weather conditions, and culture.

newly forming adventitious roots forming
Adventitious roots forming on tomatillo stem

Normal bumps and Swellings on Stems

Small knobs, swellings or bumps on stems are usually harmless and caused by plant genetics (natural growth) or stressors in the environment. Pepper and tomato plants often exhibit such growths.

forming adventitious roots on tomato stem
Small bumps on tomato stem

normal pepper stem swelling
Swellings on pepper stem

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