when shalll i change the light cycle??

so i got 3 clones and one p i started from a seed. They have been growing on 18/6 for a month nowand are looking real nice. My question is when should i start flowering them. They are all over a foot tall except one indica i got going and the seedling. i was thinking about flowering them in about a week or so....any advice on when i should start the flowering cycle?

you can start flowering them any time it doesn't affect the plant more veg = more yield though

It's really a matter of the space you have and how big you want them to get.

Yeah it all depends on space available and how much you want. I think you should be fine with the clones and could start now. Or wait till they grow a bit more