I'm not sure how rates where I am compare to where you're at, but I feel in general 15 is a good area to start at. I only have 2.5 employees, but they all make more than that.
Many people think landscaping is a low paying, entry level job. And some employers view it that way too.
But to attract decent employees, that can do a physical job at a good pace, while still maintaining quality, and show up every day, is a lot more rare than you would think.
You can pay top dollar and get a shyt employee. But you can't pay bottom dollar and get a good employee.
16 years experience, 10 as owner/operator.
And still not rich