Ummm
Do we water on the same day each week/month?
We really should all grow the same clone bought from the same source
What is the sunny side of the house when you get so close to the arctic circle that it never comes up?
Oh and is there a standard compost recipe?
How far from the house, some roofs have big over-hangs? (Rain shadow issues)
Pots should all be the same size I suppose.
All in cheekIts a nice idea Mark but I think we have already got something along the same lines with many of us growing the same taxa in different parts of the globe and reporting on our plants as the season rolls along.