This is the second year that we have had out 6m tall Fairy Bell Christmas tree (cone shaped led mesh) on the front lawn. This is the second year that I have had to mow the lawn where the tree stood. All that extra light made the grass grow! Another observation I have made is that the houseplant Rhoicissus ellen danica is very, very hardy. I left one outside hidden behind some terracotta pots and it's still green and surviving despite having a sprinkle of snow and despite being outside in sub-zero temperatures. That's a hardy houseplant.