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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