A Gardeners Forum Forums General Discussion The House Plant Forum Fertilizer shelf life?

Hey all,

How long will liquid fertilizer (the 7 drops to 1 liter type) retain its, um, efficacy? How long is it good?

Thanks.

What brand do you use and what is the NPK ratio, if any?

I use Spray N Grow.
I still have some left over from 3 years ago. As long as the container is sealed properly it will last for a few years; however, once the Spray N Grow concentrate is mixed with water, the resulting mixture loses effectiveness in 4-6 hours.

This may not answer your question about the shelf life of your favorite liquid fertilizer, but at least you will have some idea.

Well, it's hardly my "favorite." If I recall correctly it was one of the cheapest varieties. Hence my suspicion it may not be good any more.

Thanks.