Colt rootstock still on patent?

itheweathermanDecember 21, 2013

Is colt rootstock still on patent?

I'm asking this question because I'm planning graft it onto my proprietary Krauter vesuvius myrobalan plum x mariposa plum hybrid---I want to use it as an inter-stem for my bing cherry.

If it still on patent, I will not graft it.

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olpea(zone 6 KS)

Colt patent was issued in the 70s, developed by the Malling station in England. It's patent has long expired. PP#4059

    Bookmark   December 22, 2013 at 1:15AM
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