Wondering

This plant is killing me it's leafs look bad and it seems to be taking forever to flower, any ideas what's going? I think it might be slight nite burn with high temps? Also I was wondering when's the best to top these little guys?

Yo da f............

there are way more variables than nute burn and high temps... besides, you didnt name recent nutes or recent temps. You top after the nodes switch. If you want further help we need a more detailed picture man. sorry.

Your plant looks fucked...maybe nitrogen toxicity. Kinds looks like It reveged. I would start over

Yep you hit the nail on the head, nute burn and probably high temps as well. You need to be fairly careful when growing sativas, what soil are you using?