Propagation and Cultivation Methods for Sageretia Bonsai

Sageretia thea, also called sageretia and Chinese sageretia, is a sprawling shrub in the genus Sageretia, family Rhamnaceae. The bark is grayish-brown, the branches slender and long, and the leaves small and leathery. The flowering period is September to October, with spicate panicles that are greenish-white. The fruiting period is April to May of the following year, and the fruit turns purplish-black when ripe, giving it high ornamental value. Sageretia thea prefers light and tolerates slight shade; it likes a humid and moist climate but is not strongly cold-hardy; it suckers vigorously and tolerates pruning; it is not demanding about soil and can grow in neutral, acidic and alkaline soils.

Sageretia thea has strong adaptability, grows vigorously, has a well-developed root system, sprouts readily and tolerates shaping and pruning. It likes a warm, humid climate and tolerates poor, thin soil and dryness. It grows especially well in partial shade. Its vines twine around rocks and climb cliffs, clinging strongly to walls, with branches slanting this way and that, now sparse and now dense, elegant and bold, and the vines are hoary and strange, making it an excellent climbing plant. In gardens it is often used as a hedge, and it can also be grown in pots. In pots it must be shaped and pruned regularly and can be trained into various forms by wiring. In addition, the fruit of Sageretia thea is sweet and edible, the tender leaves can be used as a tea substitute, and the roots are used medicinally. So how do you propagate and cultivate Sageretia thea bonsai?

1. Selection of seedling sources

1) Propagation: when the seeds of Sageretia thea are fully ripe, collect them and sow them in loose, fertile, well-drained sandy soil (silt) or leaf mold. After the seedlings emerge, from October of the 3rd year begin transplanting them with soil into nursery ground; generally they can only be potted and cultivated after 6 years of sowing. If propagated by seed, at least 10 years are needed to cultivate a vigorous, old-style Sageretia thea stump bonsai.

2) For Sageretia thea, seedlings of 2-3 years or more are generally chosen for potting and cultivation, and some bonsai have been cultivated for several decades or more; newly dug large old stumps from the mountains have an even longer tree age. To make small or miniature Sageretia thea bonsai, 2-3 year old seedlings from seed or cuttings are commonly used. To make large or medium bonsai, wild stumps are mostly used, seeking naturally old stumps that are gnarled, crooked and strangely shaped, which have endured years of being cut by people and gnawed by livestock; dig them out, taking care to protect the root system, remove useless branches, and plant them in garden ground to build up for one or two years before potting.

2. Treatment of tree stumps

Before planting, soak the stump in water appropriately; the soaking time should not be too long, otherwise dehydration will occur. The wounds on the stump head need to be sealed with latex to reduce water evaporation or the spread of dead branches at the wounds. Stumps that have undergone initial treatment and trimming should not be planted or placed in pots in high places. In high places with strong sunlight and dry winds, the stump's own water supply is insufficient and water loss is great, so it very easily dies; Sageretia thea should be planted in a shaded, wind-sheltered spot.

The best planting season for newly dug stumps is from December each year to March of the following year; once the sprouting branches are 10-20 cm long, the unwanted sprouts can be rubbed off, and branches that are kept but grow too long should also be shortened appropriately to reduce water consumption and let the tree's nutrients concentrate in the stump and at the branch wounds.

3. Cultivation methods

1) Soil selection: Sageretia thea is quite adaptable to soil and not very strict about it, and can grow in slightly acidic, neutral and slightly alkaline soils. For general planting, fertile, loose sandy soil can be used; if there is no sandy soil, some household-burned coal cinders can be mixed in.

2) Potting: in spring, before Sageretia thea sprouts, pot it in February-March. The potting soil is best as loose, fertile, slightly acidic soil, which can be made by mixing leaf mold, garden soil and pond mud with sand. Light-colored glazed pottery pots or purple clay pots are commonly used, and rectangular or oval pot shapes are suitable.

3) Styling: for old stumps of Sageretia thea, the style should be created according to their own characteristics, shaping by adapting to the material and guiding according to the situation. The method of coarse wiring with fine pruning is mostly used. Common forms include slanting trunk, lying trunk, curved trunk and cascade. Small branches are often pruned into cloud-like or steamed-bun shapes.

2) Moisture retention: for Sageretia thea bonsai planted in high places or placed on a balcony, keep the potting soil moist, especially in summer or autumn; to prevent wind, most of the potting soil can be wrapped with plastic film to reduce water evaporation, but guard against waterlogging in the pot and poor air permeability.

4. Maintenance and management

1) Location: Sageretia thea bonsai should be placed in a sunny, ventilated, warm and humid environment, shaded in summer and brought indoors for care in winter.

2) Watering: Sageretia thea likes a moist environment, and during the growing season the potting soil should be kept moist, but not waterlogged or overly wet. In summer, spray water on the ground and leaves to lower the temperature and prevent dryness.

3) Fertilizing: during the growing season, apply a light fertilizer combined with watering about every 20 days; do not fertilize during the dormant period.

4) Shaping: Sageretia thea sprouts very vigorously; prune once every year after autumn, thinning out overly dense branches, leggy branches and diseased or pest-damaged branches and other branches that affect its appearance. At the same time, pinching and leaf removal should also be done. The best ornamental period for Sageretia thea is when the new leaves first begin to open in spring; if before autumn arrives you remove the old leaves in several batches and apply some nitrogen fertilizer, it can promote the sprouting of new leaves. After 20 days, it enters another ornamental period.

5) Repotting: usually repot once every 2-3 years, and the time should be in early spring, February-March. While changing the pot, take care to prune the root system and apply sufficient base fertilizer.

6) Pest and disease control: Sageretia thea has many kinds of pests and diseases, mainly longhorn beetles, scale insects, stinging slugs, red spiders and wood-boring insects. Therefore, check constantly, and once pests or diseases are found, spray the tree with insecticide.

Sageretia thea likes sunlight and tolerates heat, cold and shade; in the south it does not need to be moved indoors to overwinter. However, in the north it should be moved indoors for care in late autumn, frequently moved outside during the day for conditioning and moved back indoors at night, and in winter it should be moved outside as little as possible.