god thats a small picture ... only thing i know that color.. since i can barely see shape.. is one of my fav's .. forget-me-not ... google it.. images button .. good luck ... ken PS: a name thats hard to forget.. once you know it.. lol

Thank you purpleinopp

i'm going to chime in on this, albeit very, very late, because i accidentally found it via search, and i have pertinent details to add. i may have just gotten lucky, but i have had an oleander on my 2nd story deck for almost 3 years now in a very large 12-15 gallon (or larger) square terra cotta pot. it's been there, 10' away from the house, left outside through the winter, through all half a dozen snows, sleets, hailstorms and ice storms this year and previous years as well, and it's doing great. i keep it pruned down to a smaller compact shape (no more than 4ft tall, 3' wide), it flowers like crazy year round, and it seems to do well. occasionally it gets grumpy, like during last year's drought, and some of the leaves yellow and fall off, but otherwise it's done exceptionally well. it gets a good bit of afternoon sun, from around noon till at least 5pm-6pm in the evening. i have seen others around, but not many. this one in particular is not something i planted (a former roommate left it behind), nor is it something i would have planted, but it is doing absolutely superb AFAIK. I'm pretty sure this guy is fairly root-bound in its current pot, but not sure my deck can really handle anything much larger in size to plant it in. i don't want to put it in the ground around the house due to its poisonous nature (small kids and animals galore nearby)

This is Polygonum persicaria, commonly called Knotweed, Smartweed, or Lady's Thumb. It is native to Europe and considered an invasive species here. (I just looked it up so don't be too impressed!) I've actually been using these plants to fill space in my big new flowerbed for a couple of years. I pull all but 3 or so. They are almost 6 feet tall right now and about 8 feet around. The stems of some of them are bright red and very pretty. The only thing is trying to decide when to cut them all down to prevent a million little babies next year. I let one go to seed in a corner of my vegetable bed last year and this spring I literally had a carpet of little baby plants, and they germinated in succession. I pulled babies for a couple of weeks and they just kept coming. I ended up just spraying them all with roundup. If you can control its potential to take over, I think it's a really beautiful plant.