How to diagnose indoor plant problems from leaf spots?

Introduction

Leaf spots are one of the most common warning signs your indoor plant gives you. The tricky part? Those brown, yellow, or black dots can come from very different causes — from harmless water marks to infections. Learning to read their pattern helps you fix the problem fast.

1) Identify the color and shape of spots

Yellow halos or brown centers often indicate fungal or bacterial infection. Evenly brown dry patches can be sunscald or low humidity. Black, mushy areas often mean overwatering or root rot.

2) Check which leaves are affected first

If older, lower leaves spot first, it’s often a watering or nutrient issue. When newer growth spots quickly, think of light burn, pests, or calcium deficiency.

3) Feel the leaf texture

Soft or slimy spots = rot; crispy brown edges = dryness or light stress. Healthy tissue around the spots means the issue may be environmental rather than infectious.

4) Check your watering and humidity routine

Overwatering leads to soggy roots and leaf edema (raised blisters). Underwatering or dry air creates crispy edges. Grouping plants and adding trays of water can improve humidity balance.

5) Examine light and airflow

Insufficient airflow or cold air drafts can trap moisture and promote fungal spread. Direct sun through glass can also scorch leaves. Aim for bright, indirect light with gentle airflow.

Conclusion

Leaf spots are your plant’s language for stress. Observe color, pattern, and texture to uncover whether it’s a care, environment, or disease problem — then act accordingly.