A clear difference in HFCWO devices. Since therapies can be effective only when patients comply with them, the SmartVestÂ® Airway Clearance System from Electromed stands apart among high frequency chest wall oscillation (HFCWO) devices.
The 2012 USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.
An alternative means of describing plant hardiness is to use indicator plants (the USDA also publishes a list of these to go with the hardiness zone map). In this method, common plants with known limits to their range are used. Gardening books are available that provide more information on climate zones.