How to Grow Schefflera? Detailed Guide to Cultivation Methods and Precautions
Schefflera, also known as umbrella tree, schefflera tree, etc., is an evergreen shrub plant of the genus Schefflera in the family Araliaceae, with very high ornamental value. Large potted plants are suitable for placement in hotel lobbies, library reading rooms and museum exhibition halls, presenting a natural and harmonious green environment. In spring, summer and autumn, they can also be placed in shaded courtyard areas and on building balconies for viewing. Now let us take a look at the cultivation methods and precautions for Schefflera!
Growth Habits of Schefflera
Schefflera is a common plant in evergreen broad-leaved forests of tropical and subtropical regions. It prefers warm, humid, semi-sunny environments, and is best grown in deep, fertile acidic soil, though it is slightly tolerant of poor soil. The optimal growth temperature is 16-27°C. It likes humidity and fears dryness. Under conditions of high air humidity and sufficient soil moisture, the stems and leaves grow luxuriantly, but too much water causing waterlogging will lead to root rot. It has a wide adaptability to light and can grow under full sun, half sun or semi-shade conditions, but the intensity of light has a certain relationship with leaf color. The soil should preferably be fertile, loose and well-drained sandy loam. For potted soil, use a mixture of peat soil, leaf mold and coarse sand.
Propagation Methods of Schefflera
1. Seed sowing: Schefflera can be sown immediately after harvest, or the seeds can first be stratified in sand to promote germination, and after the seeds crack and show white, they can be sown in pots or in the ground. Sow in pots with leaf mold or sandy soil, covering with soil about 1-2 times the diameter of the seeds. The optimal germination temperature is 20-25°C. Keep the pot soil or seedbed moist. For seeds sown immediately after harvest under suitable temperature conditions, seedlings will emerge in about 15-20 days. For those sown after sand stratification to promote germination, they will emerge after one week at the optimal temperature.
2. Layering: For Schefflera, in April to June, select 2-year-old branches, make a ring cut about 1 cm wide, wrap the wound with a mixture of 1 part wet sphagnum moss or coniferous soil and 1 part garden soil, and tie both ends tightly with plastic film. On sunny days, use a syringe to water daily to keep the medium moist. After rooting, cut from the connection point with the mother plant and transplant.
3. Soil cuttings: In conjunction with repotting, heavy spring pruning, or before buds sprout in early spring, cut 10-15 cm long 1-year-old branches as cutting material. Remove the lower leaves, keep 3-4 leaves at the top, and cut the bottom into a slanted surface. First use a small wooden stick to poke holes in the medium, insert 2/3 of the cutting into a pot with perlite as the medium, keep room temperature at 15-25°C, and roots will form about 1.5 months after cutting.
4. Water cuttings: Use a mineral water bottle or glass cup, tall glass, or jar, rinse clean, and use as a container. Cut the lower end of an 8 cm cutting into a flat cut, keeping only 3-4 leaves at the top. Fill the container with clean water, then insert the cutting into the container and suspend it in the water so it does not touch the container wall or bottom. When white roots 1-2 cm long grow from the bottom of the cutting, remove and pot it.
5. Mist cuttings: Use plastic film or a small glass greenhouse to create a high-humidity micro-environment, allowing Schefflera to propagate rapidly under high temperature and high humidity conditions. First lay a layer of bricks at the bottom of the cutting bed, then lay a 30 cm thick layer of sterilized plain sandy soil on top. Select 8 cm tender branches of the current year as cuttings. Insert 2/3 of the cutting into the plain sandy soil, mist after insertion, keep room temperature at 15-25°C, spray water on the leaves once a day, and transplant after rooting.
Cultivation Methods of Schefflera
1. Soil: The cultivation soil for Schefflera should preferably be fertile, loose and well-drained sandy loam. For potted soil, use a mixture of peat soil, leaf mold and coarse sand. For potting, generally use leaf mold or peat soil, garden soil plus about 1/4 river sand or perlite mixed evenly. To make it fertile, add a small amount of cake fertilizer powder as base fertilizer.
2. Planting: Select strong seedlings with well-developed and complete root systems and plant them in pots in late autumn or before spring germination. Before planting, place a tile over the drainage hole at the bottom of the container, and fill part of the nutrient soil into the container. After planting, add more soil so that the roots are in close contact with the soil, with the soil surface level with the pot rim. After watering thoroughly and letting it settle, keep the soil surface about 5 cm below the pot rim as a watering space. Newly potted plants should first be placed in a semi-shaded area for one week, then gradually transitioned to a sunny location for normal care.
3. Watering: Schefflera grows well in environments with high air humidity and sufficient soil moisture. Note that the pot soil must not lack water, otherwise it will cause a large number of leaves to fall off. Under low temperature conditions in winter, watering should be appropriately controlled. If using a plastic container, pay attention to drainage. Keep the soil moist and water promptly before it dries out completely. In dry weather, also spray the plant to increase humidity. During the plum rain season, prevent water accumulation in the pot.
4. Sunlight: Schefflera prefers semi-shade and should be placed under bright scattered light for cultivation. When the light is suitable, the leaves are glossy green and vibrant, and can be enjoyed for a relatively long period. In winter, it can be moved near a south-facing window for cultivation, allowing it to receive more sunlight so the leaves become glossy. It is best to move the pot outdoors twice a year in spring and autumn to a well-ventilated location with appropriate light for a period of cultivation, but during outdoor care, direct sunlight exposure must be avoided, otherwise the leaves are prone to turning yellow and withered, reducing ornamental value.
5. Temperature: The optimal growth temperature for Schefflera is 16-27°C. From March to September, it is 21-27°C, and from September to the following March, it is 16-21°C. It can still grow normally under high temperature conditions above 30°C. In winter, the temperature should not be lower than 5°C. If the temperature is below 0°C, the plant will suffer frost damage and show leaf drop, but if the stem is intact, new leaves will sprout again in the following spring.
6. Fertilizing: Schefflera's peak growing season is from March to September. Apply some compound fertilizer or cake fertilizer water every 2-3 weeks. For variegated varieties, do not fertilize too much (especially nitrogen fertilizer), otherwise the leaves will turn green and lose the characteristics of the original variety. For spotted-leaf varieties, apply less nitrogen fertilizer to prevent the spots from fading or disappearing.
7. Pruning: Schefflera tends to sprout leggy branches, so mature plants need regular shaping and pruning to maintain a neat and attractive plant shape. For perennial old branches, when the plant shape becomes too large, heavy pruning can be done before new buds sprout each year in conjunction with repotting, cutting off the upper branches and leaves and part of the old roots.
Precautions for Schefflera
1. Leaf spot disease: Can be controlled with 0.5%-0.6% Bordeaux mixture (made by mixing 0.5-0.6 parts quicklime, 0.5-0.6 parts copper sulfate, and adding 100 parts water), or 70% thiophanate-methyl wettable powder or 50% carbendazim wettable powder at 800-1000 times dilution, or 50% thiophanate wettable powder or 65% zineb wettable powder at 500-600 times dilution, and other chemical solutions. Spray the solution 1-2 times every 10-15 days.
2. Anthracnose: Can be controlled with 75% thiophanate-methyl wettable powder at 1000 times dilution, 75% chlorothalonil wettable powder at 600 times dilution, or 25% tanterling wettable powder at 500 times dilution, 25% benomyl emulsifiable concentrate at 900 times dilution, or 50% tuijunte at 800-1000 times dilution, or 50% tanfumei wettable powder at 500 times dilution, and other chemical solutions. Spray the solution once every 7-10 days, for 3-4 consecutive times.
3. Leaf miner: Can be controlled with 25% dimehypo aqueous solution at 400-600 times dilution, 2.5% deltamethrin emulsion at 3000-4000 times dilution, 5% chlorfluazuron emulsifiable concentrate at 3000 times dilution, 24% methomyl solution at 2000 times dilution, 40.7% chlorpyrifos emulsifiable concentrate at 1000 times dilution, 5% lufenuron emulsifiable concentrate at 3000 times dilution, 25% diflubenzuron suspension concentrate at 1000 times dilution, 20% fenvalerate at 8000 times dilution, 20% fenpropathrin emulsifiable concentrate at 2000 times dilution, etc. When spraying for control, note that different types of pesticides should be applied in rotation to avoid the development of pesticide resistance.
4. Red spider mite: During major outbreaks, spray 20% dicofol emulsifiable concentrate at 500-600 times dilution, 20% fenpropathrin emulsifiable concentrate at 2000 times dilution, 5% hexythiazox emulsifiable concentrate at 1500 times dilution, 50% monocrotophos emulsifiable concentrate at 1500 times dilution, 40% isocarbophos emulsifiable concentrate at 1500 times dilution, 40% omethoate emulsifiable concentrate at 1500 times dilution, 10% bifenthrin emulsifiable concentrate at 3000 times dilution, etc., which can greatly reduce pest population density. To prevent pests from developing resistance, pesticides should be used alternately or mixed.
5. Scale insects: Can be sprayed with Jie Bi Zhi diluted 750-1000 times, focusing on the areas where scale insects occur, spraying until wet but not dripping. When scale insect infestation is severe, spray again every 7-10 days for more significant results.
6. Thrips: Spray 80% dichlorvos at 10000 times dilution, 40% omethoate at 1500 times dilution for control.