Stockholm Alien Growth

This alien entity grew very rapidly, faster than what we could burn down. The broccoli which was a fairly primitive species on earth, was willingly absorbed into the entity. A few hipsters from southern part of Stockholm who identified as plants was unwillingly absorbed as well. The small part of mankind that survived is now reduced to a very primitive species that somewhat managed to adapt to the new environment. But eventually the entity used up all water and moved on into space, where it, the broccoli and every other absorbed plants from different planets lived happily ever after.