Osmanthus tree is a kind of common garden tree species in southern China. Seedlings also can be cultivated through soilless potted way as long as it�s fertilized zinc sulfate and other water soluble fertilizers.

Fertilization time: about on every February and August
Compound water soluble fertilizer ingredients: mixed fertilizers mainly contain sulfur fertilizers as magnesium sulfate, borax, zinc sulfate, copper sulfate and ammonium molybdate. 5 grams compound is enough for each pot dosage, which is evenly applied in the matrix.
Effective period: 3-4 months

Advantages: The fertilizer by this solution not only long-term works but slow-released zinc sulfate. Besides, this fertilization may also cut the production cost, reduce labor intensity and improve efficiency.