Bonsai have a very limited space for root growth so they need feeding regularly.
Soil fertility is an issue with Bonsai.
Bonsai Focus is rich in humic acid to maintain soil fertility over time.
For all species of Bonsai.
Check additional info for dosage advice
Other plant nutrients
Mix 5ml Bonsai Focus per litre of clean water.
Feed plants weekly during the growing season,
NEVER allow plants to dry out.