The Latest Guide to Growing African Violets: Methods and Precautions
The African violet (Saintpaulia) originates from the tropical regions of East Africa. It prefers a warm climate and dislikes high temperatures. It is relatively shade-tolerant and grows best in indirect light. The plant is small and delicate, with colorful flowers that bloom in all four seasons. It is an excellent indoor flower and a world-famous potted plant, especially popular in Europe and America. Let's take a look at the growing methods and precautions for African violets!
Growth Habits of African Violets
African violets prefer a warm, humid, and semi-shaded environment, and are sensitive to strong light and high temperatures in summer. The optimal growing temperature is 16-24°C, with 18-24°C from April to October, and 12-16°C from October to April of the following year. Daytime temperatures should not exceed 30°C, as high temperatures are detrimental to the growth of African violets. Winter nighttime temperatures should not fall below 10°C, otherwise the plant is prone to cold damage. Relative humidity of 40%-70% is most suitable; if the potting soil is too wet, the roots are prone to rot. If the air is dry, the leaves lose their luster. African violets need shading in summer to keep their foliage lush and green, while in winter they need ample sunlight to continue blooming. Adding supplemental light on rainy and snowy days is very beneficial for the growth and blooming of African violets.
How to Grow African Violets
1. Soil: The potting soil should be loose and fertile, preferably rich in humus. A common mix is 5 parts leaf mold, 3 parts garden soil, and 2 parts decomposed manure soil, or 6 parts leaf mold mixed with 4 parts sandy loam, or leaf mold, peat soil, and sand mixed in equal parts.
2. Watering: Watering is very important. In early spring when temperatures are low, watering should not be excessive, otherwise the stems and leaves are prone to rot, affecting blooming. In summer when temperatures are high and dry, more water should be given, and misting should be used to increase air humidity, otherwise the flower stalks droop and the blooming period is shortened. However, when misting, too much water splashing on the leaves can also cause leaf rot. In autumn and winter, as temperatures drop, watering should be appropriately reduced.
3. Light: African violets need a light intensity of about 200-800 foot-candles, with about 8-12 hours of exposure. To promote blooming, the light duration can be gradually extended to 16 hours. Outdoor direct sunlight often exceeds 8,000 foot-candles, which can easily cause sunburn to the leaves and is not suitable for African violet growth. However, indoor light is often insufficient, causing slow growth, failure to bloom, or leggy growth.
4. Temperature: African violets prefer warmth. The optimal growing temperature is 16-24°C, with 18-24°C from April to October, and 12-16°C from October to April of the following year. Daytime temperatures should not exceed 30°C, as high temperatures are detrimental to the growth of African violets. Winter nighttime temperatures should not fall below 10°C, otherwise the plant is prone to cold damage.
5. Fertilizing: Fertilizer should be applied lightly. During the growing season, apply a diluted decomposed liquid fertilizer containing nitrogen and phosphorus, or a compound fertilizer, about once every 10 days. Be careful not to apply too much nitrogen, otherwise the leaves grow very lush but few flowers are produced. For this reason, the ratio of nitrogen, phosphorus, and potassium should be 1:1:1.
6. Pests and Diseases: Under high temperature and humidity conditions, wilt disease, powdery mildew, and leaf rot are prone to occur. A 1000-fold dilution of 10% antibacterial agent 401 acetic acid solution can be sprayed or poured into the potting soil. Scale insects and red spider mites often harm African violets during the growing season and can be controlled by spraying a 1000-fold dilution of 40% omethoate emulsifiable concentrate.
Precautions for Growing African Violets
1. Choosing pots and substrate: Since African violets have a small root system, the pot should not be too large when planting; choose a pot size appropriate to the plant. The potting substrate should be a loose, fertile, well-draining, neutral to slightly acidic growing medium.
2. Watering and fertilizing: The amount of water depends on the growing season. In winter and early spring when temperatures are low, watering should not be too frequent; water only after the potting soil has dried, and maintain relative humidity at around 40%. In summer when temperatures are high, more water should be given, and the surroundings should be misted frequently, with relative humidity not less than 70%. In autumn, as the climate cools, watering should be reduced accordingly. During the growing season, apply a diluted decomposed cake fertilizer water or liquid fertilizer once every 2 weeks, but be careful not to apply excessive nitrogen. After flower buds appear, apply 1-2 applications of 0.5% superphosphate to make the flower colors more vivid. When watering and fertilizing, be careful not to get it on the leaves to prevent rot.
3. Temperature and light: The suitable growing temperature for African violets is 18-24°C. In summer, the temperature should not exceed 30°C, so measures such as shading, cooling, and humidifying should be taken. They should not be exposed to direct strong light, but also should not be grown in overly shaded conditions for too long, which can cause few and pale flowers, or even failure to bloom. For home growing, they can be placed in a location with indirect light and good ventilation. In winter, the temperature should not fall below 10°C.
4. Pay attention to pest and disease control: During cultivation, root rot, crown rot, powdery mildew, aphids, mites, thrips, nematodes, and other problems are prone to occur. Attention should be paid to ventilation and disinfection of the growing substrate before use. When the above pests and diseases are found, relevant pesticides should be sprayed promptly for control.