@JennyJif you watch the video, she says she usually collects manure for mulching from local farmers, and used mushroom compost. I've no doubt it works for her. I'm just interested in how and why it works.
I think it would smother the plants, but then I have pretty dry soil and a lot of what I grow likes those conditions and wouldn't like being covered in damp mulch. I sometimes chuck a little pile of twiggy compost over the crowns of dahlias to protect them over the winter, but 2 feet at a time seems like complete overkill and adding more in spring would be an open invitation to slugs. I've not had time to watch the video yet but I'm guessing the lady is growing tall statuesque moisture-loving perennials not things like salvias and lavenders. So I suppose the answer is, there's no single right answer.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
It can be used , but it will feed as well as mulch. Basically it is compost that has added feed. It you can get composted green waste , home made compost or well rotted farm yard manure, it will be cheaper. Bear in mind it need to be two or three inches deep to do any weed suppressing.
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