A friend's garden is not doing well. He has not mixed manure or other organic
material with the soil since he started gardening three years ago. Plants in
his garden are just not growing. The problem is that he has been relying on
short-cuts such as Miracle Grow.

Is there any product he can add now that would let him salvage this year's crop
without digging up the garden and adding manure?
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Gardening Zones
Canada Zone 5a
United States Zone 3a
Near Ottawa, Ontario