Pine needles make a great mulch, but do they make soil acidic, or is this a gardening myth? I ask Stephen Legaree to share his thoughts on the topic. Also, please see the links to sources on this topic below:
Links provided by MrChipGardener:
Forest Industry Council – http://www.forestindustrycouncil.com.au/factsheets/f2.pdf
Washington State University – http://spokane-county.wsu.edu/spokane/eastside/Fact%20Sheets/C091%20Soil%20pH%2005.pdf
Links to additional sources:
Colorado State University Extension http://csuturf.colostate.edu/Powerpoints/2011%20Turf%20Myths.pdf
GardenMyths.com
http://www.gardenmyths.com/pine-needles-acidify-your-soil/
“Decoding Gardening Advice”, p. 49
Stephen also used these references:
Wood Chip Mulch: Landscape Boon or Bane?
http://puyallup.wsu.edu/~linda%20chalker-scott/horticultural%20myths_files/Myths/magazine%20pdfs/
Woodchips.pdf
BorealForest.org
http://www.borealforest.org/index.php?category=world_boreal_forest
Acid Rain Effects – Soils http://www.elmhurst.edu/~chm/vchembook/196soil.html
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