When in the process do you use mycorrhiza?

[Mr Bones]

Only bought it once, to bump up the cost of a purchase so it became eligible for free postage (so voted Never). After a few seasons of no-dig the plot's now full of it.

[Snoop Puss]

^Interesting.

I've never used it and never bought it, but I was thinking about getting some for some walnut cuttings I want to take.

[Penellype]

I've used it once, when it came as part of a tree planting kit that I got with my minarette fruit trees. It was cheaper to buy the whole kit than the bits of it that I really needed (pots, tree ties, stakes, compost etc). As I was planting in pots in compost consisting of coir blocks and a mixture of nutrients supplied with the trees, there did seem to be some point in adding the mycorrhiza.

Like many others on this thread I don't really see the point in adding something that is there already if you are planting in the soil. Using it for veg never crossed my mind - brassicas don't form a symbiotic relationship with it anyway.

[rary]

Never used it I find things grow well enough without an unnecessary added cost

[It never rains..it pours]

I did a little reading on this once and came across a scientific trial on pine saplings that showed about 10% better survival rate. So I have used it on all bare root trees. At �1 a time to try and protect �5 to �45 (cost range of the 10 bare root trees have planted), hopefully avoid replanting effort/cost and most importantly as Nickdub once said, you can never get a year lost back, it seems ok punt to me. I did try small trial on strawberries once, only because some left over, but vine weevil destroyed the results. Wouldn't use on anything cheap or on veggies

[quanglewangle]

I thought I should put my two pennyworth in, having started the poll.
Onions
I did a trial on onion sets a few years back. A tiny pinch in each dibbed hole. Two rows with RootGrow and two rows without. I invited folks from the local gardening club to blind-judge the difference a few weeks before they were fully ripe. They could tell at once which ones had been inoculated: almost all were significantly bigger. Now this was a long way from a proper trial: I knew which ones were which and could have unconsciously favored the treated ones.
Greenhouse beds
I make up compost for greenhouse beds from GPC, sterile topsoil, and sharp sand so this will have no native fungus in it. I coat the roots of e.g. melons and tomatoes before setting them out.
Aubergines in pots
Same as greenhouse beds, sterile compost so I use it when setting plants out into their pots.
Modules to pots
I take the "can't do any harm" view and coat very small amount around the roots as I pot-on from modules.
Cost
You really don't need much. A packet lasts a season and that includes non-veggie uses too.
BTW It goes much further if you grind it up in a pestle and mortar just before use although probably best not to breathe the dust.