Cultivation Methods and Care Tips for Trailing Petunias
Trailing petunias are characterized by trumpet-shaped flowers, a faint fragrance when in bloom, abundant flowers, and a beautiful plant form. They have excellent ornamental value and are well suited to hanging baskets. Their cultivation method is simple. Below are care tips for trailing petunias, which those who like this flower can refer to.
Growing Environment
Trailing petunias prefer a warm, sunny, and cool environment. They tolerate cold and high temperatures slightly, and are afraid of drought and waterlogging. They have low requirements for water, fertilizer, and soil, and grow best in well-drained, fertile soil rich in humus.
Sunlight and Temperature
Trailing petunias only bloom under long-day conditions, so potted plants must be placed in an environment with sufficient light. With sufficient light, the branches can bloom when they grow to about 10 cm; otherwise, short days will inhibit flower buds and result in fewer blooms. Consecutive rainy days will delay flowering. In winter, keep the temperature at 4-10°C; below 3°C the plant stops growing. In summer, it can withstand high temperatures of 35°C.
Water and Fertilizer Control
Trailing petunias like fertilizer and need sufficient water and nutrients during cultivation. Applying a nitrogen-phosphorus-potassium fertilizer once every half month is enough to effectively promote strong roots and lush branches and leaves. Stop nitrogen fertilizer before flowering, and apply phosphorus and potassium fertilizer during the flowering period. During the peak growing period in summer, maintain sufficient moisture; watering in the morning and evening is advisable. Keep the potting soil moist but not waterlogged, as waterlogging causes root rot and the whole plant to wilt and die. In winter, simply keep the potting soil slightly moist.
Pruning and Shaping
Trailing petunia branches grow quickly, and some plants have few branches, which makes the flower basket look sparse, so timely shaping and pruning are needed. When the branches have 15-20 side branches, the plant can be allowed to grow as a trailing plant. Aged branches should be pruned promptly to encourage new growth. During the flowering period, remove spent flower buds to avoid consuming too many nutrients. If there are yellowing old leaves, cut them off promptly.
Daily Management
Trailing petunias have strong disease resistance, but overwatering can cause plant aging or root rot and death. Excessive drought can cause the leaves to die. When fertility is insufficient, it can also cause leaf yellowing, smaller leaves, fewer flowers, and paler flower color.
Trailing petunias have rich flower colors and beautiful flower shapes, with excellent ornamental value. This flower has a long flowering period and is a very good hanging basket flower. Those who like flowers and plants can grow them.
Cultivation Methods for Trailing Petunias
Trailing petunias like light and fertilizer and are afraid of drought, so they should be placed in an environment with sufficient light for cultivation. Under sufficient light, the branches can bloom when they grow to about 10 cm. To ensure that trailing petunias have dark green leaves and bloom frequently, fertilizer should be applied in a timely manner. During the flowering period, reduce nitrogen fertilizer and increase phosphorus and potassium fertilizer. Also pay attention to removing yellowing old leaves and spent flower buds. During cultivation, note the following points:1. Seedling Stage Management
When the seedlings' 2 true leaves unfold and turn green, begin foliar fertilization. The initial concentration should be lower (such as 75 μl/L nitrogen), then gradually increase the concentration, preferably applying a complete-element fertilizer. During the seedling stage, spray water promptly, and gradually reduce the frequency of spraying, finally watering based on the wet-dry cycle. If the temperature is too high and humidity too high during the seedling stage, fungicides should also be sprayed to prevent damping-off disease.
2. Transplanting Seedlings and Potting
Transplant when the seedling root system has developed enough to be easily pulled from the plug tray, moving them to small nutrient pots or directly transplanting into special hanging basket pots. Depending on pot size, 1-5 plants can be planted per pot. This allows different sizes of trailing petunias to be obtained in a relatively short time. If not using plug tray seedlings, use seedling trays. Generally, after emergence, when there are 2-4 true leaves, transplant once; when there are 6-8 leaves, they can be potted using a 10-14 cm diameter pot. The potting soil should preferably be culture soil with a pH of 5.8-6.2. If it is greater than 6.5, the plant will develop yellow leaves caused by iron deficiency.
3. Temperature Regulation
In the early potting stage, the temperature should still be maintained at 18-20°C, then can be lowered to 12-16°C. Lower temperatures are beneficial for the accumulation of plant substances and enhance the branching ability at the base. The temperature can be as low as 3°C, but prolonged low temperatures can also cause yellow leaves.
4. Humidity Control
Avoid excessive moisture in the substrate. If water accumulates in the pot for a long time, the roots often rot and the whole plant wilts and dies. Keeping the substrate dry is very important, so potting soil should be well-drained. In the early growth stage, water can be appropriately increased, but about 7 days before leaving the nursery, it should be kept dry to prevent leggy growth.
5. Light Regulation
Petunias need to bloom under long-day conditions; short days will inhibit flower buds. A day length of 13 hours can be provided. When light is weak and days are short, supplemental lighting of about 4500-7000 Lx can be added to promote flowering. Most petunia varieties take about 100 days from sowing to flowering under normal sunlight. If light is insufficient or there are too many rainy days, flowering is often delayed by 10-15 days, and the number of flowers is fewer.
6. Fertilization Management
To make the plant's root system strong and the branches and leaves lush, fertilization is very important. Use compound fertilizer (20-5-30) and calcium-magnesium-containing fertilizer (13-2-13-6Ca-3Mg) alternately. Keep the substrate EC value at 110-112. For trailing petunia varieties, the fertilizer amount should be larger, with the fertilization concentration increased from 100-150 mg/kg for general varieties to 200 mg/kg, and the medium EC value can also be 1.2-1.5. If strip-like yellowing appears on the leaves, it is often caused by boron and calcium deficiency, and can be remedied with boron at 40-60 mg/kg or calcium compound fertilizer.
7. Shaping and Pruning
If there are few branches and the branches grow quickly, the flower basket will look sparse, so timely shaping and pruning are needed. When the petunia has grown 15-20 side branches, it can be allowed to grow as a trailing plant. Aged branches should be pruned promptly to encourage regrowth.
8. Pest and Disease Control
Trailing petunias have strong disease resistance and generally have no diseases, but overwatering can cause aging or root rot and death. Excessive drought can cause the plant's leaves to dry out and age, and old leaves to die. When fertility is insufficient, it can also cause leaf yellowing, smaller leaves, fewer flowers, and paler flower color. If the plant has been maintained for too long, or if cuttings are used for cultivation, and the leaves become smaller, it is very likely caused by a virus.
Common pests of trailing petunias include whiteflies and leafminers, and timely control is very important. Leafminers can be controlled with 800 times dilution of trichlorfon, and whiteflies can be controlled with 1000 times dilution of pirimicarb.
Cultivation Methods and Precautions for Trailing Petunias
Trailing petunias like light and fertilizer and are afraid of drought, so they should be placed in an environment with sufficient light for cultivation. Under sufficient light, the branches can bloom when they grow to about 10 cm. To ensure that trailing petunias have dark green leaves and bloom frequently, fertilizer should be applied in a timely manner. During the flowering period, reduce nitrogen fertilizer and increase phosphorus and potassium fertilizer. Also pay attention to removing yellowing old leaves and spent flower buds. During cultivation, note the following points:1. Seedling Stage Management
When the seedlings' 2 true leaves unfold and turn green, begin foliar fertilization. The initial concentration should be lower (such as 75 μl/L nitrogen), then gradually increase the concentration, preferably applying a complete-element fertilizer. During the seedling stage, spray water promptly, and gradually reduce the frequency of spraying, finally watering based on the wet-dry cycle. If the temperature is too high and humidity too high during the seedling stage, fungicides should also be sprayed to prevent damping-off disease.
2. Transplanting Seedlings and Potting
Transplant when the seedling root system has developed enough to be easily pulled from the plug tray, moving them to small nutrient pots or directly transplanting into special hanging basket pots. Depending on pot size, 1-5 plants can be planted per pot. This allows different sizes of trailing petunias to be obtained in a relatively short time. If not using plug tray seedlings, use seedling trays. Generally, after emergence, when there are 2-4 true leaves, transplant once; when there are 6-8 leaves, they can be potted using a 10-14 cm diameter pot. The potting soil should preferably be culture soil with a pH of 5.8-6.2. If it is greater than 6.5, the plant will develop yellow leaves caused by iron deficiency.
3. Temperature Regulation
In the early potting stage, the temperature should still be maintained at 18-20°C, then can be lowered to 12-16°C. Lower temperatures are beneficial for the accumulation of plant substances and enhance the branching ability at the base. The temperature can be as low as 3°C, but prolonged low temperatures can also cause yellow leaves.
4. Humidity Control
Avoid excessive moisture in the substrate. If water accumulates in the pot for a long time, the roots often rot and the whole plant wilts and dies. Keeping the substrate dry is very important, so potting soil should be well-drained. In the early growth stage, water can be appropriately increased, but about 7 days before leaving the nursery, it should be kept dry to prevent leggy growth.
5. Light Regulation
Petunias need to bloom under long-day conditions; short days will inhibit flower buds. A day length of 13 hours can be provided. When light is weak and days are short, supplemental lighting of about 4500-7000 Lx can be added to promote flowering. Most petunia varieties take about 100 days from sowing to flowering under normal sunlight. If light is insufficient or there are too many rainy days, flowering is often delayed by 10-15 days, and the number of flowers is fewer.
6. Fertilization Management
To make the plant's root system strong and the branches and leaves lush, fertilization is very important. Use compound fertilizer (20-5-30) and calcium-magnesium-containing fertilizer (13-2-13-6Ca-3Mg) alternately. Keep the substrate EC value at 110-112. For trailing petunia varieties, the fertilizer amount should be larger, with the fertilization concentration increased from 100-150 mg/kg for general varieties to 200 mg/kg, and the medium EC value can also be 1.2-1.5. If strip-like yellowing appears on the leaves, it is often caused by boron and calcium deficiency, and can be remedied with boron at 40-60 mg/kg or calcium compound fertilizer.
7. Shaping and Pruning
If there are few branches and the branches grow quickly, the flower basket will look sparse, so timely shaping and pruning are needed. When the petunia has grown 15-20 side branches, it can be allowed to grow as a trailing plant. Aged branches should be pruned promptly to encourage regrowth.
8. Pest and Disease Control
Trailing petunias have strong disease resistance and generally have no diseases, but overwatering can cause aging or root rot and death. Excessive drought can cause the plant's leaves to dry out and age, and old leaves to die. When fertility is insufficient, it can also cause leaf yellowing, smaller leaves, fewer flowers, and paler flower color. If the plant has been maintained for too long, or if cuttings are used for cultivation, and the leaves become smaller, it is very likely caused by a virus.
Common pests of trailing petunias include whiteflies and leafminers, and timely control is very important. Leafminers can be controlled with 800 times dilution of trichlorfon, and whiteflies can be controlled with 1000 times dilution of pirimicarb.