- Wet, poorly drained soil
- Crowns below soil level
- Hot (especially afternoon) sun
- Pests: Thrips, leaf miner, spider mite, caterpillar, botrytis, powdery mildew, fungal rot and crown rot.
- Light - Gerberas require high light intensities for good-quality plants and high flower bud numbers... Plants receiving too little light have pale green, stretched foliage and long, weak flower stems. Plants receiving too much light have compact, slightly yellow foliage with short flower stems often hidden in the foliage. (Morning sun or filtered sun is best in our location).
- Watering - Gerberas should receive a thorough watering and then be allowed to dry somewhat. This discourages soil-borne diseases. Gerberas should never be allowed to wilt, however. Plants allowed to dry out too much and too frequently have short flower stems that may be hidden in the foliage. It is also a good practice to water early in the day so the foliage is completely dry before evening.
- Diseases - Powdery mildew, Phytophthora (crown/root rot), Botrytis, impatiens necrotic spot virus, and bacterial blight are the main disease problems of gerberas. (Do not overcrowd plants).
- Foliage too large or flower stems too long:
- Light intensity too low
- Ammonium fertilizer too high
- Flower stems too short:
- Plants too dry
- Soluble salts too high
- Growing temperature too cold
- Flowers distorted:
- Mite or thrips problem
- Soluble salts too high
- Temperature too high or too low
- Plants stunted or failing to grow:
- Drainage or aeration poor; plants too wet
- Soil temperature too low
- Plants planted too deep
- Plants wilting or dying:
- Plants planted too deep--crown rot develops
- Root rot
In the U.S., California and Florida are the leading states in the production of cut flowers and tissue-cultured stock. The majority of cut gerberas, however, come from Columbia and surrounding countries in South America, with substantial quantities coming from the Netherlands. Current breeding strives for vigorous growth, compact habit, and continuous flowering on sturdy stems. The domesticated cultivars are mostly a result of a cross between Gerbera jamesonii and another South African species, Gerbera viridifolia. The cross is known as Gerbera hybrida. Thousands of cultivars exist. They vary greatly in shape and size. Colors include white, yellow, orange, red, and pink. The center of the flower is sometimes black. Often the same flower can have petals of several different colors. It is the fifth most-used cut flower in the world (after rose, carnation, chrysanthemum and tulip). Gerberas are attractive to bees, butterflies and birds, and are resistant to deer.