d04dd710____Recycling___City_of_Toronto__Best_uses
[Type] Pine needles [Features] Excellent weed suppressant; slow to decompose; retains moisture; acidic [Sources] Pine trees; landscapers [Best uses] 
Acid-loving plants such as azaleas, rhododendrons, blueberries; should be composted first for best use of acidic properties
Yard waste, lawns and composting - Overview - Garbage & Recycling | City of Toronto
Best uses