Dipsacus, probably D. fullonum, TEASEL. Joe

That's why we use binomials. Excerpt from Wikipedia... Vinca minor (common names lesser periwinkle or dwarf periwinkle) is a species of flowering plant native to central and southern Europe, from Portugal and France north to the Netherlands and the Baltic States, east to the Caucasus, and also southwestern Asia in Turkey. Other vernacular names used in cultivation include small periwinkle, common periwinkle, and sometimes in the United States, myrtle or creeping myrtle,[1] although this is misleading, as the name myrtle normally refers to the Myrtus species.

I had my first pond when I was about 5 years old. We lived on a farm and there was an old farm pond about 2oo yards in back of our barn. I found I could "play" behind the barn out of sight from the house and then sneak back to the pond. I went back there as often as I could. I only got caught once, got yelled at and told not to go there. So I got better at sneaking. I totally could have died back there...but the risk was well worth it imo. It taught me so much and got me interested in learning. People today are starting to consider the possibility that we're over protecting our kids. Park where kids can use tools, build fires, do what kids do. But to the question... Here is my Kinder Pond. I built this for the neighborhood kids because they were always want to see my ponds in my backyard and to play in them. I've seen kids drink water out of it. Yeah, sure could make them sick. So could the cat poo they picked up and ate. So could licking their shoes. So could... To make this durable and reasonably safe I did the following. Made it shallow. Just 3" for most and 10" in the center. That also made it a great bird bath which was unexpected and really great for bird watching. Kids like watching birds too. Added a wide stream. Kids love to build dams so I didn't want a stream that was right to the edge of it's banks. If they were going to dam it and overflow the banks I wanted to make sure they had to work at it. I added a small waterfall. The sound of water is attractive to kids and other wildlife. It has to be strong enough to stand on. I used EPDM liner and concrete over that. Bare line and kids I don't think would be good. They would pull it up to see what its was or what was under it. So no visible liner. I mortared all rocks in place. Being shallow means not a lot of water which is a problem. I sure didn't want the pump visible in the pond. You think raccoons are inquisitive, kids have them beat. So I buried a 55 gal plastic drum about 5' away from the pond/stream. A pipe went from the 10" deepest spot in the pond to the drum using a bulkhead fitting on the drum (Uniseals are great). Pump went into the drum set on some bricks so it wasn't right on the bottom. Power cord went thru conduit to GFI outlet with a locked steel cover. A hose from the pump went underground to the stream top. No visible pipes. I built a very heavy cover for the drum and screwed thru that into the side of the drum. The drum is the dangerous part so that had to be secure. I made the top out of plastic decking so it weighed about 40 lbs which by itself is difficult for kids to lift. The drum was set low so the top as a bit below grade making removal more difficult. I also added an auto fill to the drum. A float valve that got its water from a sprinkler valve on a timer set for 2 minutes per day. If the float valve failed, and they do, the most water that would be wasted was 2 minutes worth per day. In the pond the 10" low point was formed into a rectangle. I made a skimmer basket type deal with PVC pipe and shade cloth that fit into the formed concrete rectangle. That stopped leaves, sticks, rocks from getting into the pipe going to the drum. It ran 24/7, never was green and it never had a string algae problem. Maybe I was just lucky, maybe that most of the water spent so much time in the totally dark drum helped. I didn't ever see mosquito larvae in this pond. Don't know why. Another option which I've seen kid enjoy are bogs. Pond or stream that maybe at lease 12" deep and filled with pea gravel. Water level can vary from just below the surface to as deep as you like above the gravel. Like a wet sand box. Kids can build streams, dig, do whatever they want. You can run a hose, or several hose on the surface so the kids can move them, build water falls, or whatever. I'd keep the hoses near the center and short enough so they could be move to outside the bog.

Good job. So again, it is/was an attractive plant-no question there-but its proven invasiveness makes further use in the trade verboten-I think. Not going to drag this convo down into the weeds, but there is a huge amount of controversy overall about invasive exotic plants and their true impact. Again, not going to get into details but suffice to say, I believe each and every case must be considered on its own merits. I am one of a group of researchers and practitioners who believe some of the poster-plants for exotic invasiveness have actually never been proven to displace native species. But that said, the shrubby ones that I'm aware of all seem to create real and lasting problems. +oM