Gigi,
The green tips of sion material often fail as flat grafts, but for some reason they have a high success rate as V grafts.
I learned this in a Thai video of a full time grafter churning out dozens of grafts per hour. He had rhythm pumping out flat grafts until he got to the green tips and then he V grafted the last piece.
I figured that there was a reason if they were doing it commercially. I think that it's got something to do with the increased grafting surface area.
I've used it this year with 100% success.
PS. I use grafting tape to hold the sion just tight enough for 8 days.
