Two approaches to renaturalizing quarry sites located in southern Ontario are discussed. The first approach, which was applied at the Walker Brothers quarry in Thorold, involves the use of nursery stock planted in cells. As the planting mature, they should begin to spread and intergrade with each other to form a dynamic, diverse and self-sustaining vegetation community. The second approach, which was applied at the Dufferin Aggregates Milton quarry, involves the use of forest soil as the source of vegetation stock. The soil, which was stripped as part of the on-going extraction operation, provides a large quantity of seeds, rhizomes and stolons. These native species should be sufficient to provide a dynamic, evolving plant community. Both of these sites will be monitored over the long term to determine changes in the vegetation community composition, influence on colonizing plant species and use by wildlife. The first year’s results of the monitoring program are discussed.