[MetallicCloud]

I'm not a gardener at all, but it shouldn't be hard to figure out, should it?

Get like 9 of the same plants at the same point in the life cycle, wash 3, leave 3 and do the 50\50 for 3. Compare results.

If it's as big a deal as people make it out to be, it should be obvious, no?

[jspash]

In theory, yes. In practice it would require me buying 9 trees and waiting for 3-5 years to see the results - and i'm getting old ;)

But I do like a good experiment! And my neighbours garden is quite bare. Now you got me thinking...