Let's make sure I understand the layers of a tree

toronado3800 Zone 6 StLouis(6)December 22, 2013

My understanding:

The live portion of a tree is the outside layers, the Phloem, Cambium and Xylum.

It is these layers which are likely to become infected when I prune a tree with dirty tools, while the green is still showing after a deer comes by and rubs, or while bugs are digging in. Essentially the foliage and these layers are what Round-up can travel in and affect also.

The inner layer, the heartwood, is there for structural support but does nothing to keep the tree green.

Thank you for reporting this comment. Undo
whaas_5a(5A SE WI)

Nice graphic, the cambium is a good indicator as to whether a tree is alive/has a dead branch. Xylem is what transports water. If that is damaged you can have some longer term issues depending on the severity.

I had an Alaskan cedar that had 50% heartwood exposed on one side. It was alive but I didn't want to invest in the tree at that point.

    Bookmark   December 22, 2013 at 12:01PM
Thank you for reporting this comment. Undo
brandon7 TN_zone(7)

Xylem is not an outside layer. It's the inner most part of the tree, and makes up the sapwood and heartwood. New sapwood is "living" (definitions of this vary) and transports water and nutrients up from the roots to the leaves. As the sapwood ages, it gradually dies (or at least becomes far less active), and is referred to as heartwood. There is a continuum between the sapwood and heartwood: it's not two distinct layers.

Cambium does not transport water, sap, or RoundUp.

Phloem, the tissue that carries sap through the tree in either direction, is what is responsible for transporting RoundUp.

    Bookmark   December 22, 2013 at 1:26PM
Thank you for reporting this comment. Undo
arktrees(6b NW Arkansas)

toronado,
See link below. It spells out what each layer is and what it becomes.

Arktrees

Here is a link that might be useful: Anatomy of a tree trunk and funciton

    Bookmark   December 22, 2013 at 2:21PM
Sign Up to comment
More Discussions
Getting below freezing temps tonight, will it hurt my peach tree in bl
I'm in Dalles GA. temps will drop into the high 20's...
abykatz22
Graft incompatibility sugar maple
Recently had a commemoration sugar maple installed...
othertime
White spruce - one side of bark decaying
This tree still looks healthy all the way up, it's...
qwertyjjj
Just bought a house. Need help identifying trees!
Hello all, I have no real knowledge of tree types and...
gavinhall
Does anyone on here have a Cercis canadensis - Eastern Redbud Tree?
I want to get a couple of them. Are they wind tolerant?...
ilovemytrees
Sponsored Products
Versatile Cypress Bowl
| Dot & Bo
Crown 22 x 22 Pillow
$22.95 | Bellacor
Olde Bronze Wall Sconce 1-Light
$56.00 | PLFixtures
Serena & Lily Fiona Crib Bumper
Serena & Lily
Contemporary Indoor/Outdoor Area Rug: Artistic Weavers Rugs Noah Beige 3 ft. 3
Home Depot
Montcalm Forged Brass Rope Pull with Backplate
Signature Hardware
Toronto Maple Leafs Dinner Set
$16.99 | zulily
Emerald Home Furnishings Iverson TV Console - Cherry - E1239M
$427.99 | Hayneedle
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™