Spores of fungi like mycorrihzae and trichoderma or bacteria can't be keep dormant and alive forever. Most products will claim an expiration date of 1 or 2 years without loss of viability.
Best advise there is to only buy what you need for 1 or 2 growing seasons at the most.
If one ounce of Mycogrow will cover your needs for your garden for one season, don't buy a pound.
It's hard to recommend brands since most of us have used only a limited number of them. You can go with the sellers with more established products like Ami endorses or you can try something newer to the market. I don't personally look at brands as much as I look at contents and the benefits for my particular needs. Most vendors selling mycorrihzae and trichoderma or bacterial inoculants don't actually make their own raw materials, very few companies have the facilities, the equipment or the expertise to mass produce biological inoculants on an economic scale.
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