How do I landscape our ditches?

Line with rock after you do a total kill

I would kill off the grass there with an herbicide for grasses, then reseed with a short variety of grass seed used on golf courses - 3".

Mow it short, put weed block net down n rock or bricks or what ever is fairly inexpensive (not sure how big ur ditch is lol)

I would always suggest to evaluate your situation beyond just mowing and maintenance of the ditch area. Our 20 year established ditch is lined with 6”-8” rocks probably over top of some original erosion mesh. It does not feed into wetlands or waterways. We spray twice a year to keep grasses and weeds from taking hold (once just this last weekend, and again in July if anything is growing in spite of the May spray). If we did not maintain it, we would not be breaking any neighborhood rules or covenants, it would not impede the visibility of cars or negatively impact safety for walkers or children playing and riding bikes. We just appreciate the cleanliness of the look. If we had waterways or wetland issues at play, we would not be using chemical treatments of any kind. As an alternative, I would strongly consider plantings of mixed wild flower seed. It would offer beautiful floral naturalized landscape without requiring maintenance other than a once a year weed wack before the new season flowers began to grow. Once they are established, they will re-seed themselves and a heavy growth of them will crowd out weeds. Any sneaky weeds will just blend in. The wild flowers also attract beneficial insects and birds and are just pretty to look at as well as adding a cut flower option for the home through the season. This may be a less expensive alternative to the full erosion mesh and stone application – not to mention the labor is far less back breaking. A 1# bag of mixed perennial wildflower seed provides coverage for 500-1000 square feet. Volume pricing is in place with most vendors. A 5# bag could be ordered and shipped for about $120.