Low Light and High Humidity: Identifying Oedema

Figure one: Typical symptoms of Odema/Intumescence.

Figure 1: Typical symptoms of Odema/Intumescence.

Oedema or edema, also known as intumescence.  This physiological disorder usually appears during periods of low light – from now through the fall, winter and into the spring.  If you’ve noticed salt-like crystals, odd tumour-like growths or water-soaked spots on either side of your plant leaves this disorder could be the culprit (Figure 1). The disorder affects a wide variety of tropical plants and succulents.  It can also affect greenhouse crops such as lilies, cyclamen, sweet potato vine, geranium, begonia, petunia, calibrachoa, ornamental peppers and other Solanaceae family plants. Continue reading