Botrytis blight is common during cool, moist weather. Oedema causes corky spots on the leaves and occurs when plants are over-watered. Reduce watering frequency, keep water off leaves, increase air circulation and make sure plants are in enough sun to reduce these problems. Keep plants cleaned of any dead, damaged, or yellowed leaves or flowers. Aphids, caterpillars, mites and whiteflies may infest geraniums.
Flower colors are usually pink, red, salmon or white.
Multibloom' series is very early-flowering, with deeply zoned leaves on small plants. Maverick' series has full flower heads in a mixture of colors including pink, red, salmon, coral and 'Star,' a vibrant pink and white bicolor. They have zoned foliage on multiple stemmed plants reaching up to 18 inches tall. Mrs. Henry Cox' is a striking zonal geranium with pink flowers that are upstaged by the dramatic yellow, deep red and green variegation of its leaves. They are used mainly in hanging baskets and window boxes.