Ohio:

Acme, when we bought this house there was an odd depression/crevice in the front yard. "Oh good-- spiraea!" sez I. "Hole 'mos' dug!"

Until JUST before I bought one, TBTG. The housemate at that time complained that the tub was a slow drain. "Clean the hair cup," ssez I. She called a plumber instead who charged me $100 to snake the drain. A year later (she was gone), slow tub drain for me-- hair cup emptied daily-- hm. Asked neighbor with decades on this block. "Roots!" sez she. Recommended great (and cheaper) plumber.

Plumber Dean found the clean out we'd not been aware of and started dredging up all kinda nasty, hairy roots. It was then that I noticed the straight line from cleanout to street ran RIGHT UNDER that crevice..... so I asked if he'd been here before.... yeah... that's why that bush they'd had got tore out.

He opined that twice-a-year root killer would probably prevent his having to do this every two years-- spring and fall, when roots are most active. I researched least-toxic/easy to use, and even found a YouTube video w instrux. Kinda pricey but not as pricey as plumbers. BRB w link.

~S~