What is this white stuff?
Efflorescence is a salty looking mineral deposit. This is often called "new construction bloom" as, with time, the appearence of efflorescence will dissipate. Minerals from the soil underneath your concrete edging may be seeping to the surface and 'depositing' themselves. Cold and wet weather will likely bring about efflorescence more often as wetness has a much longer evaporation time and minerals likewise deposit easier. Snow that sits on the edging for an extended period of time may also deposit minerals from the air as it dries.
Do not worry, some light brushing with a stiff nylon brush will likely remove much of the mineral deposit. If the appearence of efflorescence seems excessive, call us. (719) 233-3343 We are always here to help.