One winter -- no problem.

Five winters -- the bag will probably disintegrate from being in
sunlight too long when you try to move it.

Either way, if the bag is intact you can probably still use it. Just
check for things growing in it before using it for something you will
depend on. If there's moisture in the mix (there's generally some when
you buy it) you could get moss growing in it. That's fairly easy to
remove because it makes fairly cohesive lumps.

Try one (minor) houseplant and see if it has any problems. If no
problems arise after a couple of weeks, do the rest of them.



Brigitte wrote:
I have a very large bag of Miracle Gro potting soil that's been sitting on
my porch all (Nebraska) winter.

Is it still OK to use? I have a few houseplants that need transplanting
into larger pots and wondered if it would be alright to use this potting
soil.

Thanks in advance.

Brigitte