Planted at 2.5 sq. ft. per plant, my Smyrna 9 reached about 7 feet (required a step ladder to bag). Nearly the same with Xanthi Yaka 18a and Izmir Ozbas. This year, with the Xanthi planted at 0.68 sq. ft. per plant (roughly 9" apart in all directions), their height is about 3' to the crowsfoot, and the leaves are more appropriate to the variety. While the larger version (wide spacing) is good for all these varieties, the smaller leaf from denser planting is more delicate, more subtle, and more in keeping with what most folks expect from Oriental leaf.
Bob
Bob