I do the same thing, haven't used my honda 4 cycle weed eater in years. I use flowers, tigers lilies is just one flower. I use Wild strawberries, which has a yellow bloom the a red berry, as ground cover between some of my irises and sedam. I plant flowers around everything that would need trimmed, buildings, trees. Only problem are seedlings, trees, want to grow in flowers. Shovel takes care of them.
I don't have rain gutters on pole barn. Have one foot eves. Flowers prevent water from splashing dirt on side of barn. Keeping rain from dripping on siding prevents green mold from showing up on siding too.
Also rigged up a DR string trimmer on front loader to cut back all the flowers after frost.
Can't really say how many flowers we have, but the Boss likes them. She may turn her passion in to a little income soon.