Brown Tips on Plant Leaves: Diagnostic Guide

Brown leaf tips on plants — a systematic diagnostic for water stress, salt buildup, fluoride toxicity, heat stress, and fungal causes, with how to confirm and fix each situation.

The diagnostic decision tree

Step 1: What does the browning pattern look like?

• Tips only, with a distinct line between brown and green: most likely water stress (underwatering or salt buildup)
• Tips that blend gradually from pale green to tan to brown: heat or wind desiccation
• Tips with a distinct yellowing halo between brown and green: fluoride or salt toxicity
• Tips with small lesions, spots, or water-soaked borders: fungal tip blight
• Browning progressing from tip toward the base of the leaf: often vascular disease or severe drought

Step 2: Check the soil

Insert a finger or a soil probe 2 inches into the soil near the plant's root zone. Consistently dry soil (no moisture at 2 inches) points to underwatering. Wet, saturated soil even after several days without rain suggests overwatering or poor drainage leading to root stress. Both produce brown tips because damaged or poorly functional roots cannot deliver water to leaf tips — the points farthest from the water source.