0-10-10 Bonsai Fertilizer

Nitrogen-free bonsai fertilizer is best known for encouraging flower buds. It is also used by some bonsai growers in the fall to encourage root growth while discouraging top growth. However using 0-10-10 exclusively for long periods is not recommended, as some nitrogen is necessary for healthy plant growth no matter the time of year (for more on 0-10-10 for bonsai, see Michael Hagedorn's Bonsai Heresy). 

8oz bottle. NPK 0:10:10