Why shale or small rocks? To create pore space. Peat is not the amendment needed to improve clay soils. You and I alone may not be able to change the environmental degradation resulting from peat bog harvesting, but if more of us use peat-free products, like those I endorse, it may have an impact. Here’s my simple rule: If the first two or three ingredients listed on a bag of soil are peat moss or sphagnum peat moss, avoid it in landscaping. Yes, peat moss is a renewable resource, but it can take hundreds to thousands of years to form.” Despite manufacturers' claims that bogs are easy to restore, the delicate community of animals and insects that inhabit a bog cannot be quickly re-established. As Mary Cummings has written “…the biggest problem with peat moss is that it's environmentally bankrupt! It is essentially ‘mined’ by scraping off a bog's top layer of living sphagnum moss.
Peat moss is the partially decomposed remains of sphagnum moss, and it's harvested from delicately balanced bogs.
The use of peat is also environmentally unsound.
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