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At present, GuildQuality collects feedback for our members either during our customer satisfaction surveying or via their profile pages. At present, we don't accept any reviews for non-members.
If the company is a Guildmember, you should be able to submit a review in the bottom right-hand corner of their profile page. For companies that are not Guildmembers, we don't presently accept reviews.
A landcaping contractor might help. Depending on your location, you may be able to find someone here: http://www.guildquality.com/find/Landscaping-and-hardscaping/North-America