To a gardener, “old” soil refers to soil that is no longer very fertile and not ideal for growing plants. It may be depleted of nutrients, it may have too much salt/mineral build-up, it may be choked with dead roots, or it may have pests.
Soil
Potting mix, Peat, Garden soil, Dirt, Clay, Sod, Turf, Compost
Recyclable?
Blue Bins & Chutes
Other Recycling
Recommended
Reuse
Don't just throw it! Make your old soil new again.
Follow NParks instructions here on how to make your old soil as good as new.
Alternative
Tips & Suggestions
Do you do composting? Great.
You can add moderate amounts of soil into your compost pile/bin. Depending on the quality of the soil, you may want to follow the nParks advice on sterilising it first.
Alternative
Freecycle / Give Away
Ask your local community gardeners if they want it.
But don't just dump it in their garden! Ask first!