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Maybe you need a different kind of pumpkin seeds, one that is more resistant in the urban jungle.

Last year I planted these in April in my house and at the celebration day I moved young plants into the urban jungle. This is a brutal, ruthless environment :D

This is a brutal, ruthless environment

True, but still some plants have ways to conquer it. :))

Yeah, you know, survival of the fittest :D Apparently my little home-grown pumpkin shoots were not the fittest after all xD

Natural selection! :))