At the same time, however, a certain lack of space in the pot leads to short shoots and the desired maturation of a bonsai. Finding the right time to repot is therefore a matter of degrees, and it is advisable to document the repotting cycles and keep a close eye on plant growth. However, if the soil surface is very hard and the plant hardly absorbs water when watered, this is a sure sign of a compacted root ball. Also, the drainage holes at the bottom of the pot are then usually overgrown. Repotting should be done at this point at the latest. Deciduous trees are ideally repotted in the spring (February-March) before leaf emergence. For conifers, late summer (September) may also be recommended, depending on weather and overwintering possibilities. Indoor bonsai can be repotted throughout the growing season (February-October).