John Naka used to talk to himself while demonstrating: "I don't have
branches on this side, so I don't need roots on this side."
What he was saying was that water and nutrients DO move vertically in the
tree.
They do NOT move horizontally. It is, of course, possible for a tree to
keep its leaves on a non-watered side because the neglected side may survive
on rain water or run-off water; but that side will never do as well as the
regularly watered side. Sorry, Mark, but that's the way it is.
Marty
----- Original Message -----
From: "Mark Hill"
To:
Sent: Thursday, July 17, 2003 12:31 PM
Subject: [IBC] Dumb Cambium Layer Question


Thanks for this useful info Nina.

I always wondered how the cambium layer worked.

For example, If I only water a tree on one side, why don't the branches on
the opposite side of the tree die ?
I have trees in my garden that I know only receive water on one side, yet
the branches/leaves continue to grow all around the tree.
The cambium layer must be able to move water laterally as well as
vertically.

Interesting topic !!

Regards
Mark Hill - Harrisburg PA - Zone 6


-----Original Message-----
From: Internet Bonsai Club ] On Behalf
Of
Nina Shishkoff
Sent: Thursday, July 17, 2003 11:53 AM
To:
Subject: [IBC] Dumb Cambium Layer Question

Now you're getting the idea. Yes, there must be continuity from roots to
the
branch you're working on. If you cut two notches on the same branch, the
same rule applies.
Marty

Trees will compensate for things like that, given time. Both xylem
(water carrying elements) and phloem (nutrient-carrying elements) are
linked end-to-end with many seive-like pores. However, there are
lateral pores, too, and this allows lateral spread. The new growth
from the cambium the year after the cut will differentiate to
compensate as well. So you can make the two notches, but if the tree
experiences water stress, water will travel to other branches faster
than to that branch, weakening it. So make sure the tree is
well-watered until healing occurs.

The cambium is an awesome thing. We're used to thinking of organisms
with support on the outside (insects and crustaceans) or on the
inside (coral), but trees have both.
--
Nina Shishkoff

Frederick, MD


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+++++ Questions? Help? e-mail +++++

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