Sorry if this has appeared before. Does cutting off the seed head when it appears have any beneficial effect or is it just a question of lifting and eating any bolters.

I want to provide greenhouse ventilation using a louvre which would replace a full sheet of standard glass.(2'x2' approx) I have seen these but cannot find a supplier. Thosel I see advertised are "half the depth" of a full sheet and many are not glass but polycarbonate. I can have what I w...