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mounting above the graft on established trees?

 
Christopher A smith
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We have a few well established peach and apples trees. They were grafted on to hardier root stock for our climate. Recently my wife and I mounted shaving mixed with horse menu re at their base and planted irises and garlic. The mound is higher than the graft mark.

My understanding is when planting it isn't a good idea to have dirt above the graft mark because the scion will root.

Is it OK to have mounded compost/manure above the graft line if the tree is well established or do we need to change it?
 
Akiva Silver
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The only reason you would not want the scion to root is because it will eliminate the dwarfing influences of a rootstock. If you are not worried about a dwarf rootstock then it is better to let the scion root. You will have a much stronger tree in the long run.
 
Ann Torrence
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Location: Torrey, UT; 6,840'/2085m; 7.5" precip; 125 frost-free days
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I would pull it back for a different reason. Manure and shavings are going to make a fine rodent habitat for bark-gnawing little beasties.
 
Christopher A smith
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Thanks Akira Silver. In this instance our peach tree in question is pretty large (maybe 12 feet tall and 5 inches at the trunk). I think it's past dwarf but don't know for sure.
 
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