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25-06-2004, 07:57 PM

In article ,
writes:
| In article ,
| Keith Michaels wrote:
| What causes a tree on a dwarfing rootstock to suddenly start
| growing into a full size tree? My dwarf Lapin cherry was
| well-behaved for 3 years, putting out new shoots of 6" to 8"
| per year, but for some reason this year the new growth is
| 20" and it's only June!
|
| IIRC, Lapin is a genetic dwarf -- it's dwarfed on any rootstock.
|
| Having you been fertilizing it? Excess nitrogen can cause excess
| new growth. If the tree is in a lawn, it may be getting too much
| nitrogen when you fertilize the lawn. Lawn fertilizers are very
| high in nitrogen.

I think this is the problem. It's in a lawn that was fertilized.
I know about preventing scion roots; the graft is 6" above ground..