Do you have a list of lawn service companies who are master gardener certified?
Multnomah County Oregon
Thank you for your question to Ask the Expert.
OSU does not have a certification program for landscape companies. If you are looking for a reliable lawn care company. Here is information from Oregon Department of Agriculture regarding hiring a landscape company: http://www.oregon.gov/lcb/pages/consumer_information.aspx#How_to_Get_Help_if_There_is_a_Problem
Also, the Oregon Landscape Contractors Association has a search function to find liscenced landscapers: http://www.oregonlandscape.org/displaycommon.cfm?an=1&subarticlenbr=3
Please let me know if you have any further questions.