blackstrap

I'm looking into using Blackstrap Molasses but can't seem to find any in Canada that say unsulphered. One I can get my hands on is Crosby's Blackstrap Molasses. On their website it says there is no added sulphates or sulphites. I really don't want to find out the hard way and kill my plant. Has...

what is the difference between horticultural molasses and store-bought blackstrap? is there a difference?