"Malcolm Manners" wrote in message
...
NICHE541 wrote:
On Dec 5, 8:25 pm, "Peter Jason" wrote:

Do clumps of trees and plants of the same species form
root
grafts?


Aspen trees do, I know of a PHD dissertation on the
subject but it has
been many years ago. I think that Blackjack oak and Post
oak do also.
John in the Indian Nations
Citrus trees often do, especially on 'Cleopatra' mandarin
rootstock.

I was worried that the application of a weedkiller (roundup)
on one tree might spread to an adjoining one.