1) The plants that had real trees as supports grew more over a five week period. The ones with real trees grew 22-29 cm, while the ones with the artificial trees grew 15-18 cm.
2) Vines use trees for more than just support. If that weren't true, the ones on the real and atrificial trees would grow the same amount. The three vines on the realy tree grew from 22.2%- 93.3% taller then the ones on the artificial trees.
3) I believe that the trees give the vines nutrients or other such things that would aide in the vines' growth.
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