Plant ID please
I've had this stuff growing in my garden for a few years now. It grows really well and is actually a nice looking plant so I'm ok with it being quite vigorous. In fact each spring I dig up chunks and use it to fill gaps all over the garden. Never even need to water it. Anyone know what it is? It grows about 3ft tall and spreads through shoots that are just below the surface. I guess it's technically a 'weed' but it's a welcome one.