Nandina

Fertilizing

Apply a balanced bonsai fertilizer every two weeks during the active growing seasons to promote healthy growth and vibrant foliage color changes. During winter, reduce fertilizing frequency to once monthly as growth naturally slows. Using a fertilizer specifically formulated for bonsai provides optimal nutrients while avoiding the risk of burning the delicate root system.

A proper fertilization schedule is particularly important for Nandina bonsai as it helps maintain the stunning color transformations throughout the year - from pink new growth in spring to green leaves with red edges in summer, followed by deep red fall colors and light green winter foliage.

Placement

The Nandina bonsai is quite versatile in terms of placement options. While it prefers full sun, it can tolerate partial shade, making it suitable for both outdoor and indoor cultivation. When grown indoors, place in a south-facing window to provide adequate light. For outdoor placement, ensure the tree receives morning sun but has some afternoon shade protection in very hot climates.

Despite being frost-hardy, consider bringing outdoor specimens inside or providing protection if temperatures drop significantly below freezing. The ideal temperature range is between 60°F and 75°F (15°C to 24°C) for optimal growth and health.

Pruning

Light pruning is sufficient for Nandina bonsai maintenance, focusing primarily on selective trimming to maintain shape and encourage dense growth. The best time for pruning is late winter or early spring before new growth begins. Remove dead or diseased branches with sharp, clean scissors, cutting back to just above a leaf node.

When pruning for shape, avoid removing too much foliage at once as this can stress the tree. If trunk chopping is necessary, new growth will typically appear within 6 weeks. The Nandina's natural growth pattern lends itself well to various styling options, with the twin-trunk or clump style being particularly popular when combined with careful wire training.

Repotting

Repot your Nandina bonsai every two years using a well-draining soil mixture combining sand and regular potting soil. The ideal time for repotting is early spring. Choose a pot slightly larger than the previous one and ensure it has adequate drainage holes.

Before repotting, examine the root system and perform necessary root pruning to maintain the tree's compact size. After repotting, place the tree in a shaded location for a few weeks to recover before returning it to its permanent position. This recovery period is crucial for establishing new root growth and preventing transplant shock.

Watering

Maintain consistent soil moisture without allowing the soil to become waterlogged. Check the soil daily by touching the surface - when the top layer feels dry, it's time to water. Factors like pot size, temperature, and humidity will affect watering frequency.

Water thoroughly until it drains from the bottom of the pot, ensuring even moisture distribution throughout the root system. During winter months, reduce watering frequency as the plant's water needs decrease with slower growth. The key is finding the balance between keeping the soil moist and avoiding oversaturation that could lead to root rot.

References

CareBonsai.com - Complete Guide to Nandina Bonsai Care Love For Bonsai - Nandina Bonsai Care Guide Backyard Greenery - Expert Tips for Nandina Bonsai