Australian Umbrella Tree

The Australian Umbrella Tree requires a regular watering schedule throughout the growing season. Approximately two to three times a week should suffice for the plant to remain healthy and growing. If you live in a hot, dry climate the plant may require more water. During the cooler months, scale back watering and give the plant about one to two times a week. As a rule of thumb, always wait for the soil to dry out before watering again.

The Australian Umbrella Tree thrives in bright, indirect light, though it can also tolerate low light and full sun. Avoid placing the plant in the direct path of the sun’s rays, as too much sunlight can cause damage to the foliage. Placing the Umbrella Tree close to windows is the ideal scenario, as the light will be filtered through curtains or blinds, perfectly mimicking bright indirect sunlight.

The ideal temperature for the Australian Umbrella Tree is a range of 65-75°F (18-24°C), though it can tolerate temperatures as low as 40°F (4.5°C). When grown outdoors, the plant can easily tolerate temperatures into the 80s and 90s (27-36°C), but extreme heat should be avoided. The plant won't survive temperatures below freezing, so when kept outdoors, take care to shield it from any sudden cold spells.

Schefflera actinophylla likes a moderate amount of humidity. It won’t do well in dry conditions, and a humidity level of 40 to 50% is best. Setting up a humidifier or a tray of gravel filled with water can help you maintain the ideal humidity range for your Australian Umbrella Tree.

The Australian Umbrella Tree prefers a soil that is loamy and organic. Choose a well-draining potting mix that is either pre-made or mix your own. You can make your own soil blend by combining two parts peat moss with one part perlite. Adding a slow-release fertilizer (such as one designed for houseplants) will give your plant an extra boost.

Fertilizing the Australian Umbrella Tree is important to ensure vigorous growth. During the growing season, use a weak fertilizer solution every two weeks. A balanced liquid fertilizer or slow-release fertilizer should be applied to the soil before the growing season starts. During the winter months, reduce or altogether forego fertilizing, as the plant requires a rest period.

The Australian Umbrella Tree, like most house plants, is susceptible to pests. Common pests include aphids, spider mites, whitefly, and mealybugs. Early detection can help you get rid of them before they do any significant damage. First, try with a natural insecticidal soap to see if the infestation is gone without further pest control. If not, more drastic steps may be necessary. Use chemical pesticides like pyrethrum or malathion and follow their instructions to the letter, as overuse can lead to resistance in most pests.

Depending on the age of your Schefflera actinophylla, it may need repotting in order to promote healthy growth. Mature trees planted in larger containers will only need repotting every two to three years. This should be done in early to mid springtime to ensure the tree as time to become established before cooler temperatures arrive. When repotting, use a well-draining potting soil mix and carefully water until the soil is damp.

PRuning the Australian Umbrella Tree is optional but can be done to control its size. Cutting off the long stems of the leaves helps the plant fill out and become bushier. Dead, damaged or broken stems can also be pruned off at any time. However, pruning should be done with caution — both when it comes to at what point you choose to prune and how much pruning you do.

Mulching the Australian Umbrella Tree is beneficial to the soil. Organic materials such as bark, leaves, or compost will help to keep the root system of the plant cool, while providing a steady supply of nutrients. Mulching should be done in springtime, after repotting or transplanting, and should be applied in a thick layer around the base of the tree.

The Australian Umbrella Tree can be propagated by cuttings, air layering, or by division. Taking stem cuttings is one of the quickest and most effective ways to propagate the tree. First, prepare a pot filled with potting mix. Then, take 4 inch-long cuttings of the green stems in early spring. Dip the cuttings in rooting hormone and insert them in the pot, ensuring they are 3 to 4 inches deep in the soil. Water the soil thoroughly and then cover the pot with a plastic bag.

The Australian Umbrella Tree grows to up to 10-12 feet in height and will require support if it gets too top-heavy. Plant the tree in a slightly larger pot than needed so it will not require frequent repotting. Also make sure to use a garden stake to keep the tree upright and sturdy, or use a trellis to securely hold the tree in place.

The Australian Umbrella Tree does not require a true winter rest period, but it is beneficial to do so. During a rest period, the tree should not be fertilized and the watering should be reduced by about half. Make sure to keep the humidity and temperature levels consistent during this period of reduced watering, as drooping of the leaves is an indication that the plant is not getting enough hydration.

The Australian Umbrella Tree is toxic to cats and dogs. If ingested, it can cause skin and mucous membrane irritation, as well as gastrointestinal issues such as vomiting. Therefore, it is best to keep this plant out of reach of pets.