I used this wm version of Pro Mix last year. It's a not crumbly like BX. It reminds me of a bag pf peat moss, very dense. It didn't double in size for me either. I bought it for a new raised bed. The top dries out quickly. With diligent watering and fertilizing the greens did well so there is some hope, at least for shallow rooted crops.
If this is your best option, try to cut with pine bark fines and compost for a more tomato friendly soil..
- Lisa
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