If you are looking for extra work…
Blackberry control may be an option worth considering, now is the time to start planning, growing season is coming soon.
Pros: high paying, with ongoing follow up program, very few competitors
Cons: hard work, lots of scratches, green waste removal, herbicides, some learning may be required
Herbicide control regulations differ from state to state so check the relevant DPI websites for your state.
Weed management guide - Blackberry
basic guide 438 KB .pdf
Blackberry control manual.
Very comprehensive, large 7.1 MB .pdf