Why are my Pothos leaves turning brown?

Texture tells you the cause

With Pothos (Epipremnum aureum), the feel and location of the brown matters more than the color itself. The leaves are thin and glossy with very little internal water store, so they dry and discolor in patterns that point straight to a cause.

Crispy, papery brown at the tips and outer edges, with the rest of the leaf still green, is the classic dehydration pattern. Water reaches the leaf margin last, so when the plant runs short, whether from dry soil or dry air, the edges die back first. Soft, dark, sunken brown patches that feel mushy and sit alongside yellowing leaves are the opposite problem: the roots are drowning in wet soil and rotting, so the foliage collapses from the inside. Press the brown spot gently. Dry and brittle means thirst; soft and wet means rot.

Brown edges, humidity, and tap water

Edge and tip browning is the symptom Pothos owners report most, and it has more than one root cause. Iowa State University Extension notes that brown leaf tips and edges on houseplants commonly trace back to inconsistent watering, low humidity, or a buildup of soluble salts from fertilizer and hard tap water, all of which apply to Pothos.

Pothos tolerate average household humidity, but when the air drops below about 40 percent in winter, the thinnest leaf margins crisp first. Salts are the quieter culprit: every time you fertilize, and every time you water with hard tap water, a little mineral residue stays behind. Over months it concentrates in the soil and at the leaf edges, showing up as a white crust on the pot rim and brown, burned tips even when your watering is otherwise fine.

The other browning causes

• Overwatering and root rot. Soggy soil suffocates the roots. The brown spots are soft and dark, leaves yellow, and the stem base may feel mushy. This is the most serious cause to rule out.
• Too much direct sun. Harsh, direct light scorches the foliage. Dry, bleached, tan-to-brown patches appear on the leaves facing the window, while shaded leaves stay green.
• Low humidity. Very dry air crisps the leaf margins. Tips and edges brown while the leaf center stays green and healthy.
• Fertilizer or salt buildup. Over-feeding burns the roots. Brown leaf tips appear alongside a white crust on the soil surface or pot rim.

A worked example

Imagine a Pothos on a bright shelf that you fertilize monthly and water with tap water from a hard-water area. The vines look healthy, growth is steady, but the tips of many leaves have turned brown and brittle, and there is a faint white ring on the inside of the pot. The soil is neither bone dry nor soggy. This is not under or overwatering: it is salt accumulation. Flush the pot by running water through it for a minute or two until it drains freely, repeat once, cut back feeding to half strength every six to eight weeks, and switch to filtered or rested tap water. New growth should come in clean while you trim the dead tips off the older leaves.

How to fix it

1. Read the soil and the spot. Dry soil with crispy edges means thirst; wet soil with soft spots means rot. Let this guide everything else.
2. Water consistently. When the top inch or two is dry, soak until water drains, then empty the saucer so roots never sit in water.
3. Check the roots if soggy. Unpot, trim any soft brown roots, and repot in fresh, well-draining mix if rot is present.
4. Move out of direct sun. Give the plant bright indirect light, back from hot, sunny glass.
5. Raise humidity. If air is below 40 percent, use a pebble tray or humidifier.
6. Flush the soil. Run water through the pot for a minute every couple of months to clear mineral salts, and feed only at half strength during growth.
7. Trim the damage. Cut fully brown leaves at the base and trim brown edges along the dead margin with clean scissors.