In small containers liquid ferts work much better than any granular. Faster absorbing and easier to control dilution and uptake and avoid root damage. Seedlings of any plant are normally fed at 1/4-1/2 regular strength of something in the rated range of 5-1-1. They can't cope with any thing stronger.

If you only want to use the granules you have then I would first dissolve a label-stated amount in water and then double the water dilution before using it. But without knowing the nutrient ratings on it I can't say for sure that it would be safe even at that dilution.

Dave

Hi Dave,

thank you for the advice. the fertilizer rating is 14-4-8. probably too strong then?
and if by your suggestion (feeding half strength of 5-1-1), how often should i fertilizer?
thank you very much