^^ What the good lady says.

I attempted some guerilla growing last year and it webnt wrong - if you are doign it on the sly then really put some research into your location. Funnily enough someone suggested embankments at the top of road routes...which sort of makes senes, they are not often attended, but then you get bud full of car emissions...

Anyway, apparently the 'purple' strains are more hardy and lend themselves to our fantastic climate a bit better.

Ultimately, good luck.