Possible to grow on a flat container?

Can a plant grow on a flat container like the once you use of windows?

The container would be at least 6 inches deep but 20 inches wide 7 inches deep

you could, but i don't think the roots will like it too much and it won't be too big either

Your tap root, the one that grows straight down, likes room to grow. The plant will grow OK probably... I think I read that in order to sustain the plant, the tap root should be at least 4" long.

That size "pot" is ideal for PC grows to maximize soil usage and space. So yeah sure, you can use it, but a deep pot is better.

sounds fine, only 1 plant per container though.

I'm betting that it'll grow wide, rather than tall, like when they're grown in party cups(for too long ). Those are always tall and narrow, because the roots didn't have room to spread. I think it'll do just fine, not optimum, but good, nonetheless.

maybe we should have a window sill grow contest next spring!

^Can I use HPS? My neighbors wouldn't like it very much, if I was growing weed, in my window.lol