Introduction to Care Techniques for Wild-Collected Bonsai Material: Greater Confidence in Successfully Establishing the Rootstock

Wild-collected bonsai material refers to tree stump material dug up from the wild, hillsides and other natural environments for use in cultivating bonsai. Compared with mature material grown artificially in nurseries, wild-collected material has endured wind and rain year after year, with gnarled and aged branches and trunks that carry a natural wild charm, making it a highly favored type of material in bonsai creation.

There are quite a few common tree species used for wild-collected material: among the pine and cypress types, Japanese black pine and Buddhist pine; among flowering and fruiting types, Chinese sumac and rhododendron; and among miscellaneous broadleaf types, Japanese bush cherry, elm and boxwood are all fairly common. Most of these species have strong sprouting ability and tolerate pruning well, and after rootstock cultivation and styling they often display a vigorous, ancient-looking bonsai appearance.

The main difficulty in caring for wild-collected material lies in survival. The root system is inevitably damaged during digging, so before planting the roots generally need trimming and disinfection, and the material is first grown in the ground or in deep pots with sand culture to establish the rootstock, placed in a ventilated, shaded spot to recover, keeping the soil slightly moist but never waterlogged. At this stage, little fertilizer should be applied; only after the root system has recovered and new shoots have grown steadily should it gradually be transplanted into a pot for pruning and wiring.

Particular attention should be paid to the phenomenon of false growth. Wild-collected material sometimes sprouts using nutrients stored in the tree itself, but the root system has not yet grown well, and the slightest mistake with water or fertilizer can cause the shoots to die back and the tree to wither. Therefore, in the early stage the focus should be on stabilizing the roots and keeping the plant alive, patiently cultivating the rootstock for one to two years, and only beginning styling after confirming it has truly survived, which makes it easier to obtain an ideal bonsai.