I'm calling this wild because I certainly didn't plant it. I have taken a picture, but since I can't seem to post it here I will try to describe it. This plant is now about a foot tall and it has strong stems. It has spade-shaped leaves (sort of heart-shaped but with pointier top lobes) with very bright white, very small white clustered flowers that seem to flower at the base of the leaf. It is growing more like a tree (single trunk) than a bush, but it's new so I have no idea. It sprouted in a protected area, between my house and a statue that blocks the sprinklers. It gets maybe an hour or two of sun a day. It's in an alcove, so it also gets little wind and rain. I live in zone 5b-6. Any clues?
It doesn't look like the pictures of arrowhead I found online. I was thinking that the only way it could be buckwheat would be maybe from cleaning out a birdcage within 5 feet of where this thing sprouted early in the summer?? Wendy ps for Kiev: The question marks in my reply were actually "spiseeba" - the Cyrillic letters weren't recognized.
Aha... so you have typed thank you (spasibo) in Russian. You are welcome. And I did not guess the questionmarks are Cyrillic characters just not displayed correctly...
Odd! The software for this forum usually recognises Cyrillic: украї́нська мо́ва Аа Бб Вв Гг Ґґ Дд Ее Єє Жж Зз Ии Іі Її Йй Кк Лл Мм Нн Оо Пп Рр Сс Тт Уу Фф Хх Цц Чч Шш Щщ Юю Яя Ьь (copied from http://en.wikipedia.org/wiki/Ukrainian_language )