Nuraxi , is this the growth on the graft for two years? If thats the case, could opuntia dwarf dragonfruit? Seems like this if too shy of a growth for a 2 y/o graft. Yes it will be guite heavy but i plan to support the grafts by strings that pass trought the pollicarbonate and tie them to it. Or use stakes in some way, havent really decided yet.
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This in the photo is the growth from April to October, then I was planting it in the ground, but it fell and I broke it, but I will try again in the future, i have success whit cleft graft , before grafting I removed all the thorns and buds from the 'opuntia, the central graft is died after a month.