Skip to main content

MYTH:  Ponderosa pine needles significantly lower soil pH (increase soil acidity)

Submitted by ThompsonShuswap on Mon, 09/26/2022 - 11:30
Region
Thompson Shuswap

MYTH BUSTERS SERIES

THE FACTS

Pine needles themselves are acidic but they do not have the capacity to appreciably change the soil pH (make it more acidic).

  • Pine needles break down naturally and the microbes (decomposers) in the soil neutralize them.

Pine needles can be used to mulch shrub borders, flower beds and vegetable gardens

  • Not just acid-loving plants like Azaleas, Rhododendrons, and blueberries.

Sources:
OREGON STATE UNIVERSITY EXTENSION
https://extension.oregonstate.edu/news/myth-vs-reality-whats-truth-behind-some-common-gardening-practices


UNIVERSITY OF NEW HAMPSHIRE EXTENSION
https://extension.unh.edu/blog/2019/10/do-pine-trees-pine-needles-make-soil-more-acidic

PDF
Attachment Size
Pine Needles Acidify Soil Mythbuster_0.pdf 242.83 KB