Q.Upside down peas
I’m new to upside down gardening and since it’s early spring, I’ve started with a pea. It’s growing vigorously, but UP the side of the container. I’m worried that either it is going to continue upwards or that, without supports, when it gets heavier, it will break. Should I be trying to train it down? I already have a supplementary light source below it. But it seems so happy defying gravity.

Certified GKH Gardening Expert
Gravity is an integral part of how plants function, from the transportation of hormones to signalling hormone changes.
The "topsy turvey" method is, simply, a novelty with no real utility in the garden.
You will be fighting gravity until the very end, or trying to find a way to supplement gravity in the opposite direction.