This is BioGold, A Japanese slow release Organic feed for your outdoor bonsai Trees & Plants. A very popular choice by bonsai enthusiast It breaks down slowly over time and feeds your trees every time you water. It has an NPK of 6.5/5.5/3.5 We use this on our trees and it works wonders. It goes a quite far too. Using a slow release feed significantly reduces the risk of over feeding and burning the roots of your precious bonsai. We can't recommend this product enough.