California ivy (also know as English Ivy) rarely gets to be taller than about 12 inches but its vines can stretch more than 6 feet. The plant is not sensitive to humidity and grows successfully indoors and outdoors. It is best, however, not to place it in direct sunlight in areas with high heat because this can burn the plant. California ivy can grow successfully in most soils, is comfortable with shade, and because it is an evergreen plant, it can survive the difficulties of a winter climate. It is a rapidly growing plant and can quickly overtake its environment if it is not carefully and regularly pruned. As a result, many areas strongly discourage planting California ivy outdoors.