Buxus

Fertilizing

For common boxwood, apply solid organic fertilizer monthly or liquid fertilizer weekly during the growing season, suspending fertilization during winter dormancy. Chinese boxwood requires monthly fertilization even in winter since it doesn't go fully dormant. Both species need ample nutrients to maintain their dense foliage and support recovery after pruning.

Placement

The common boxwood thrives outdoors in sunny or semi-shaded locations. For winter protection when temperatures drop below -4°C, move it to a cold greenhouse. The Chinese boxwood can be kept indoors but prefers outdoor placement during summer months. During winter, keep Chinese boxwood in a cool room around 10°C with adequate light. Both species need good air circulation to prevent fungal diseases, and their leaves may scorch in intense direct sunlight.

Pruning

Allow free growth during spring to ensure vigor, then maintain shape through regular pruning during the growing season. Start heavy pruning in mid-spring as new growth appears, removing damaged branches and those growing out of place. When thinning dense canopy, focus on allowing light to reach inner branches to prevent die-back and encourage back-budding. The boxwood's naturally stiff, angular form should be softened through careful styling. While the wood is very hard and durable, the delicate bark can be easily damaged during wiring, leaving visible marks for years.

Repotting

Repot every 2-5 years depending on the tree's age and vigor, with younger trees needing more frequent repotting. Use a basic soil mix with a pH between 7-8, adding pumice or lime rock gravel as needed. The best time for repotting is during midsummer when the tree responds better than in spring. While boxwoods tolerate root pruning well, provide a shaded recovery location after repotting. Keep developed trees slightly rootbound to maintain compact growth.

Watering

Water thoroughly during summer months while avoiding waterlogged soil. Though boxwoods can withstand brief dry periods, maintain consistent moisture by checking soil daily - when dry to the first knuckle, it's time to water. Both bottom and top watering methods work well. For bottom watering, place the pot in water for 5-10 minutes until moisture is absorbed. For top watering, thoroughly soak three times with short intervals between applications.

References

Bonsai Empire - Boxwood Care Guide Bonsai4me - Boxwood Species Guide Bonsai Resource Center - Boxwood Guide