Cotoneaster

Fertilizing

During the growing season, feed your Cotoneaster bonsai weekly with liquid fertilizer or monthly with organic fertilizer pellets. Use a balanced product rich in phosphorous and potassium to promote flowering and fruiting. Essential micronutrients should also be included in the fertilizer mix. Reduce fertilization significantly during winter dormancy and resume regular feeding in spring when new growth begins. For optimal results, combine both slow-release organic fertilizers for long-term nutrition and liquid fertilizers for immediate nutrient uptake.

Placement

Place your Cotoneaster bonsai in full sun during the growing season, but provide afternoon shade during intense summer heat to prevent leaf scorch. While naturally frost-hardy in ground plantings, protect your containerized bonsai when temperatures drop below freezing by moving it to a sheltered location or cold frame. Ensure good air circulation around the tree to prevent fungal issues, but protect it from strong winds that could damage branches or dry out the foliage. Indoor placement is possible but not ideal for long-term health and development.

Pruning

Cotoneasters respond exceptionally well to regular pruning throughout the growing season. Focus on removing dead, damaged, or crossing branches in early spring before new growth begins. Continually trim young shoots during the growing season to maintain shape and encourage dense branching. While the tree can be wired year-round, younger branches are more flexible and less likely to snap. Older branches become quite stiff and may require guy wires for shaping. Take special care when wiring during active growth periods to prevent wire scarring, and monitor wire placement regularly as branches thicken.

Repotting

Young Cotoneaster bonsai can be repotted annually in early spring, while mature specimens benefit from repotting every 2-3 years. Use a well-draining soil mix that can include akadama, pumice, and lava rock, or alternatively, a mix of potting soil, perlite, and grit. The tree tolerates root pruning well, so you can be relatively aggressive when trimming the root system. Choose a pot with good drainage holes and ensure proper soil particle size to maintain optimal moisture levels. Cotoneasters adapt well to various pH levels, from slightly acidic to alkaline.

Watering

Water management is crucial for Cotoneaster bonsai, particularly during summer when they require frequent watering to maintain consistent soil moisture. While they can survive brief periods of drought, regular watering produces better growth and healthier foliage. Monitor soil moisture by checking an inch below the surface - water thoroughly when it feels dry to the touch. During winter, reduce watering frequency but never allow the soil to completely dry out. Use proper drainage and avoid overwatering, as root rot can develop in waterlogged conditions. The species isn't particularly demanding regarding water quality.

References

The Bonsai Empire - Cotoneaster Guide The Bonsai Master - Cotoneaster Care Guide