Soft or discolored tissue near a zucchini stem can follow excess moisture, physical injury, insects, or disease. Inspecting the base early helps separate a localized problem from a plant-wide decline.
Check the soil and stem
Look where the stem meets the soil and gently move leaves aside. Healthy tissue should be firm, while a wet, collapsing area deserves attention.
Look for entry points
Inspect for small holes, sawdust-like material, chewing, or split tissue. Avoid cutting into the stem before identifying what is happening.
Improve conditions
Water at soil level, improve airflow, and keep mulch from touching the stem. Remove badly affected material only with clean tools and avoid spreading wet plant debris.
Monitor new growth
Mark the plant and check it over the next few days. Widespread wilting or a rapidly collapsing stem may require local extension advice.