Dalia: this is Day lily... usually its orange, but may be yellow...
its an import into USA but has naturalized and we see it along road
edges and ditches and any green along the parkways... provides color
where there may be none, but some people find it irksome and have
classified it as weedy...
IF YOU PLANT it in your garden, first few years make sure rabbits or
slugs don't get it, it will thrive and produce several generations of