Research Study: CSU Fresno
Planting stock consisted of green bench grafts sorted to eliminate stock variability

Study Objective: To compare vines grown in milk cartons to vines grown in various diameter prototypes of grow tubes; to determine if vines grown in tubes have greater biomass and a better balance of root / shoot growth. Is vine biomass affected by the tube diameter? Does tube diameter affect growth and survival of vines in a hot climate?

Conclusions: Vine biomass correlates with tube outside diameter (OD) in a hot climate.

Vines grown in Treessentials tubes with 3.5 inch OD are tall, have greater biomass and have equivalent root / shoot ratio to open grow vines.

Vines grown in small OD tubes are spindly. Compared to open grown vines, they have reduced overall biomass, and a poor root / shoot ratio. This is due to substantially reduced root development.

Although not shown in the chart, vines with OD smaller than 3.5 inches suffered substantial dieback and mortality when temperatures rose over 110° F.

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