Contact your local county Extension office through our County Office List.

   
Planttalk Colorado™ is sponsored by Colorado State University Extension, Denver Botanic gardens, and the Green Industries of Colorado. For additional information on gardening, see Plant Select® and Extension Publications.

2107 – Edema   Arrow divider image - marks separation between nested pages that are listed as breadcrumbs.

Edema is a plant’s reaction to an excessive amount of water in its cells. It is a physiological disorder that can affect a wide variety of indoor and greenhouse ornamental plants, particularly geraniums. Edema english ivy

The problem comes about when roots absorb more water than is released, or transpired, through the leaves. As a result, cells in the epidermis of the leaf become gorged with water. Raised blisters appear, cells burst and water-soaked and corky spots develop. Corky spots or ridges also can develop on petals and along stems and leaf petioles.

Be especially cautious of edema in late winter and during cloudy weather. Corrective measures involve changing a plant’s environmental conditions to increase transpiration. Raising the temperature, and increasing ventilation and light all will relieve edema. However, it isn’t advisable to expose house plants to direct sunlight or cold drafts.

Tell us what you think!

Do you have a question? Try Ask an Expert!