The budding crop of four plants was found by a visitor on Thursday growing on the premises of an office building for members of the upper house, an official in charge of maintenance there told AFP.
"They said the plants looked to be about two months old," he added.
"The officials explained that marijuana seeds can be carried by wind and bird excrement, and they said they will visit us again to ensure" the plants were unrooted completely and hadn't spread.
In sharp contrast, Canada said this week it would become the first G7 country to legalise the consumption and cultivation of cannabis from mid-October, arguing it would take traffickers out of the equation and protect young people.
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