Jooni
Myrtle
3 Species
Species
Fertilizing
During the growing season, feed your Myrtle bonsai weekly with a balanced liquid fertilizer diluted to half strength. If keeping your tree in warmer conditions above 50°F (10°C) during winter and it continues growing, reduce fertilizing to twice monthly. Avoid fertilizers high in nitrogen as this can promote excessive foliage growth at the expense of flowering. During the winter rest period, suspend fertilizing completely to allow the tree to enter its natural dormant phase and conserve energy for spring growth.
The right balance of nutrients is crucial - nitrogen supports leaf development, phosphorus aids root growth, and potassium maintains overall health. Be particularly mindful of signs of nutrient deficiency like yellowing leaves (nitrogen), purplish foliage (phosphorus), or brown leaf edges (potassium).
Placement
Position your Myrtle bonsai where it receives bright but indirect sunlight, as direct harsh rays can damage the foliage. During summer months, place the tree in semi-shade to prevent scorching. As autumn approaches, relocate it to a cool room with a south-facing window or under grow lights to maintain adequate light levels through winter. The ideal temperature range is between 50-80°F (10-27°C).
Indoor environments can be quite dry, so consider using a humidity tray or regular misting to maintain the moderate to high humidity levels that Myrtle bonsai prefer. Avoid placing near heating vents or air conditioning units which can create temperature fluctuations and dry air conditions that stress the tree.
Pruning
Throughout the growing season, pinch off the growing tips of new shoots to encourage branching and create denser foliage. This technique helps develop the tree's compact form and promotes back budding. For structural pruning, focus on removing crossing branches and those that disrupt the desired silhouette. Always use sharp, clean tools to make precise cuts and avoid tearing the bark.
The best time for major pruning is during the active growing period in spring and summer. When pruning, aim to maintain an open structure that allows light and air to reach the inner branches. Be particularly careful not to remove too much foliage at once, as this can weaken the tree. Root pruning should be done during repotting, but avoid aggressive root reduction as Myrtles can be sensitive to root disturbance.
Repotting
Repot younger Myrtle bonsai every 2-3 years, while older specimens can go 3-5 years between repotting. The best time for repotting is in late winter or early spring before new growth begins. Use a well-draining, slightly acidic to neutral soil mix composed of 60-70% akadama, 20-30% pumice, and 10-20% organic matter like peat moss or compost.
During repotting, carefully prune the roots, removing no more than one-third of the root mass. The new pot should be slightly larger than the root ball and have good drainage. After repotting, place the tree in a shaded location and maintain even moisture until new growth indicates successful recovery.
Watering
The key to watering Myrtle bonsai is maintaining consistent moisture without waterlogging the soil. Check moisture levels daily by inserting your finger into the top layer of soil - water thoroughly when it feels slightly dry to the touch. Ensure water drains freely from the pot's holes. Whenever possible, use rainwater as Myrtles are sensitive to high lime content in tap water.
During hot weather or the growing season, you may need to water more frequently. Reduce watering in winter when the tree's growth slows. Never water at night as this can promote fungal growth. The size of your pot, soil composition, and local climate will all influence watering frequency, so observe your tree's specific needs and adjust accordingly.