22/04/2015 at 22:38
Depends on what you want it for, I think. Just getting your seedlings started, then leaving empty the rest of the year? Growing on tomatoes, melons, etc over the summer? Overwintering plants?
I saw one somewhere that was cleverly positioned near a deciduous tree, spring and winter were full sunlight.. but during the hottest part of summer it had afternoon dappled shade.