Sometimes greenhouses are more like growing indoors. You run into heat, humidity, and air flow issues. Even light issues. I seen a few where the plant grew, stretched and spindly, because the light gets diffused. like all growing, you just have to deal with the problems if and when they arise! I go with the welded wire fence, good size cloth pots , and as much direct sunlight as possible. Everyone’s environment is different. But they need a good, regular, wet dry cycle. So you want a medium with a fair amount of breathability. Especially when they are young. Search greenhouse growing. Maybe you can pick up some tips there.