In article , j wrote:

I've got a bit of landscaping needing a little mulching. I've laid
down 4 or 5 layers of news print and topped it with some dyed mostly
pine bark mulch. I can see this is going to take a lot more bags.

There seems to be a few common mulches: pine bark, wood shreds,
shredded cypress and pine straw.

I seem to remember there was some disadvantage to the cypress, is it
that it lasts too long? Is there anything to recommend one type over
another? Appearance is important also, I've got a good bit done in pine
straw but it has an "undone" sort of appearance (which ordinarily I
like), but not for the main street view.

Jeff

You're thinking of cedar.

In terms of both its physical and chemical properties, wood is an
exceptionally difficult substrate to degrade. One of the principal
reasons is that wood contains very low levels of nitrogen, which is
needed to produce the enzymes that degrade the main structural polmers
of wood - cellulose (about 40-50% of the dry weight of wood),
hemicelluloses (25-40%) and lignin (20-35%). The lignin component also
presents a barrier to wood decay because lignin is a complex aromatic
polymer that encrusts the cell walls, preventing access of enzymes to
the more easily degradable cellulose and hemicelluloses. In addition to
these points, wood often contains potentially fungitoxic compounds,
which are deposited in the heartwood. In broad-leaved trees the toxic
compounds are usually tannins, well know for their ability to cross-link
proteins, making animal skins resistant to decay. In contrast, conifers
contain a range of phenolic compounds such as terpenes, stilbenes,
flavonoids and tropolones. The most toxic of the tropolones are the
thujaplicins which act as uncouplers of oxidative phosphorylation; they
are particularly abundant in cedarwood, making this a naturally
decay-resistant wood for high-quality garden furnishings, etc.
--
- Billy

Mad dog Republicans to the right. Democratic spider webs to the left. True conservatives, and liberals not to be found anywhere in the phantasmagoria
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America is not broke. The country is awash in wealth and cash.
It's just that it's not in your hands. It has been transferred, in the
greatest heist in history, from the workers and consumers to the banks
and the portfolios of the uber-rich.
http://www.politifact.com/wisconsin/.../michael-moore
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