Any idea why they say that soil is only for use "in the ground?" Why couldn't it be used as potting soil for propagating outdoor perennials?
Mike
Potting soil needs aeration. Usually perlite or vermiculite, but other possibilities. This will stay water logged, and not go through the proper wet/dry cycles. Your roots need air, and this will drown them.
reply to ? below - not the forum for this, but...
my initial non-sober response would be where else would you use it? Indoor would only be container growing, unless you live on a dirt floor.
but... growing in-ground is just different. If you had poor draining soil, I probably wouldn't add this. But if you have sand, or good draining soil, this can help retain moisture for a longer period, which maybe you need.
this isnt the greatest soil. At least in years past you will find particles that arent as desired (pallets, plastic), but at $1.50 it aint bad. Quality will vary depending on production plant, or even batch to batch.