I'm objecting to your pic showing a vertical pipe with plants attempting to grow upwards despite all exits of the pipe being sideways.
Horizontal being racks of horizontal earth bays where the plants grow upwards (vertical)
Unless you've got a light source coming from the side (why?) I really don't see why anyone would both with a different config.
I was merely trying to illustrate a vertical pipe with multiple plants growing. Thats it. I see the pic has confused you. I will not be planting them "sideways"....they will be upright in a vertical growing system.


