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Limestone aggregate is commonly selected for this purpose. Flux Stone – When crushed, lime can be used for smelting and other metal refining processes. The heat of smelting causes the aggregate to combine with impurities and may be removed from the process as a slag.

The metal lawn edging bends easily into smooth, graceful curves and stops the spread of grass roots. However, painted aluminum and steel offer the sleekest, most refined garden edging look because they almost disappear against the grass and garden bed. The plastic types of garden edging have a prominent black bulge along the top edge.

Oct 20, 2014· Limestone screenings create stable base for pavers, but they increase alkaline level in soil, which can harm some plants. ... (Chicago Botanic Garden)
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