Hi...

Playing around with this new electronic fertility meter, and
looking for some information, if I may?

Ground outside is still frozen and snow covered, but experimenting
with potted plants indoors. Meter indicates too little fertility,
(as I suspect it should).

But - as of a month ago, have added the correct pot size number
of Jobe's fertilizer sticks. Little effect. Have added liquid
fertilizer to the normal watering. Little effect.

The questions, then. Does fertilizer have a shelf life?
This stuff I've been using is awful old - perhaps 5 or more
years.

And looking for an effect - should it be instantaneous, or should
it take effect slowly and perhaps show up weeks or months later?

Thanks in advance for any shared thoughts...

Take care

Ken