I live in Berlin and it can get a bit cold at night here, so I am just wondering how long should I wait before I can plant a few basil plants (already around 10" tall with some large leaves but a lot of smaller ones lower down)? Currently the weather is amazing, but in the coming weeks it could still easily get down to 2-3 degrees in the night, hopefully won't but there really is no way to know. So how long should I wait?
One side question, is it possible/easy to split a basil plant in half or quarters to spread it out a little more? It is looking quite crowded around the base.