The answer
A leaf vegitable called "Sanchu" in the Korean lauguage, which is also used in Japan. The leaves are used to wrap grilled meat in Korean food.
This plant was given by our neighbor in early summer, and we did not pick the leaves for meal, which resulted into this tall plant with lovely buds at its top.

答え
韓国料理に欠かせない焼肉を包む「サンチュ」(日本名は「包み菜」)
初夏にお隣から戴いたのを、葉を摘まずに置いていたらこんなに伸びてしまった。てっぺんには可愛い蕾が沢山ついている。