There are three basic elements in any fertilizer; Nitrogen, Phosphorous, and Potassium (NPK.) Nitrogen increases the growth of the leaves and stems or the growth above ground. Phosphorus contributes to healthy root growth and the growth of fruits and flowers. Potassium enhances overall plant health. Growers often use different ratios of NPK for different trees and at different times of the year. However, experts are increasingly recommending using the same NPK ratio throughout the Bonsai growth cycle. Apart from the three macronutrients (NPK), fertilizers can also include a range of micronutrients like Iron, Manganese, Boron, Molybdenum, Zinc, and Copper.
When should I apply fertilizer?
Most Bonsai trees should be fertilized during the entire growing season; early spring through mid-fall. Older and more mature trees are often fertilized less frequently, depending on the species, time of year, stage of development, and health of the tree. Indoor trees can be fertilized all year round. Check our care guides for specific information about when to fertilize each specific tree species.
