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[QUOTE="headfullofbees, post: 26731, member: 408"]
Mycorrhizal fungi are only now becoming easily available in the UK.
Two brand names which I've used for some time are "Rootgrow," and "Vaminoc".
What mycorrizal fungi do, are to "infect" the plant's roots, (this alone triggers the plants defences) but once in there, it forms a mutualistically beneficial symbiotic relationship. It forms a huge, secondary root system which, in exchange for an unnoticable amount of the plant's carbohydrate, helps to unlock nutrients in the soil, and to make the plant far more drought-tolerant.
 
So, for a tiny fraction of a plant's carbohydrate, you get, increased disease immunity, larger, healthier plants and an earlier, larger yield, for less fertiliser. (In fact it doesn't like petrochemical fertilisers, and is one of the reasons that we keep having to add more and more when we start off down that road)
 
I add a sprinkle to my seed trays, just below seed level, at sowing time.
 
Mycorrhizal fungi do not form this relationship with brassicas.
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