Crabapple, #2523
Left Coast Bonsai, Oct sale, $60. Shohin trunk.
Care
https://www.bonsaiempire.com/tree-species/crabapple
The crabapple needs much sunlight and aeration, so place the tree outside in full sun. On the other hand it does not like strong heat, so don't place it in front of a wall which heats up during the day, for example.
The crabapple needs a lot of water during the growing season and must not dry out, especially when it flowers or produces fruit.
Apply solid organic fertilizer every four weeks or use a balanced liquid fertilizer every week during the growing season. Take care not to use a very nitrogen-rich fertilizer while the tree flowers or develops fruit because this would encourage the tree to grow strongly instead of producing fruit. Always apply the liquid fertilizer on moist soil.
Prune the crab apple in late autumn, after the leaves have fallen. Then flower buds and leaf buds are easily identified and you can take care not to cut off all flower buds. During the growing season trim back new shoots to one or two leaves when they grow overly long and thicken too much.
If the tree produces a great number of fruit, remove all but one from each cluster in order not to weaken the tree.
Younger branches and twigs can be wired but older ones are quite brittle and you better shape them with guy wires.
Unfortunately the crabapple, like most members of the Rosaceae family, is attacked by a wide range of pests and diseases. Aphids, scale, mealybugs and caterpillars can be removed manually and / or controlled with a specific insecticide. Red spider mites require an acaricide.
If mildew or rust occurs, a special fungicide is needed. Apple bonsai trees are also often infected by canker. The tree parts with ulcerations should be cut off, wounds must be sealed carefully and tools disinfected. Use a copper fungicide for prevention.
