Landscape Maintenance Association Save
Trade association promoting sound landscaping and horticulture practices in Florida.
http://www.floridalma.org/   

LawnCafe Save
Series of forums for green industry professionals, on topics including commercial lawn care, chemicals, irrigation, hardscaping and equipment, nursery operations, and industry news.
http://www.lawncafe.com/   

Professional Lawn Care Association of America Save
Trade association for residential and commercial lawn care professionals.
http://www.plcaa.org/   

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