Ivy geraniums are unique in their cultural requirements and should not be treated the same as common zonal geraniums. Light and temperature are two factors that should be considered. Ivy geraniums prefer moderate temperatures. If the temperatures are between 65 and 80 degrees F, place the plant in full-sun a location. When the temperatures are above 85 degrees F, hang the plant in a location that receives partial sun.
Varieties also differ in their response to light levels.
Too much light sun may result in small, cup-shaped leaves and small blooms. If in doubt, hang the plant in a location that receives afternoon shade. Ivy geraniums require moderate soil moisture levels - not too much and not too little. One of the major problems seen on ivy geraniums is edema, a physiological disorder caused by inconsistent moisture levels. It is characterized by many corky spots of varying size on the undersides of older leaves.