Plant care: Identifying causes of brown leaves and root dehydration

Brown leaves and dried edges on plants are often mistaken for a lack of water, but these symptoms can actually be caused by fertilizer excess or salt accumulation in the soil. Chemical fertilizers are soluble salts; if applied in high doses or without sufficient drainage, they can create a concentrated environment that dehydrates roots through osmosis. This can make a plant appear thirsty even when the substrate is moist.

Other factors contributing to brown leaf edges include low air humidity, which is common in indoor environments with air conditioning, and overwatering. Excessive water can lead to root rot, preventing the plant from absorbing nutrients and water effectively. To diagnose the issue, it is recommended to check the substrate moisture with a finger and ensure pots have proper drainage before increasing irrigation.