Brown Spots on Leaves From Over-Watering

Identification

• Excessive moisture in soil often causes roots to start absorbing more water than required. This results in a condition called oedema. When the plant is unable to use this water or transpire it through the foliage, it starts to collect in the plant cells, creating blister-like swellings.

Damage

• Oedema is characterized by the appearance of small, cork-like blisters on the underside of foliage. Over time these turn brown, white or tan and harden into wart-like formations. In cases of severe disorder, the growth also spreads to flowers, stems and petioles. Affected foliage gradually yellows and droops and plant growth declines.

Control

• Avoid over-watering plants, and try not to grow in areas of high humidity and low light. Plant water requirements typically decrease during the winter and the water amounts must be adjusted accordingly. Space plants well to improve ventilation.