My greenhouse is attached to my house on the south side, so runs E-W, doesn't get full sun. Last year I changed it up and made N-S rows (and crammed in a lot of plants!). We didn't have a sunny summer, plants grew taller, and I think all the plants were shorter of light in that orientation.. I'm going back to E-W rows this year.
My friends' greenhouse is similar orientation but wider, and the N-S rows worked for them because it's a cooler space also - the plants were short.
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