Cactus

Uuuh I like cacti? He used to reside in a mediteranean garden amongst many regular cacti. Until one day his caretaker Flora realised that he's quite unlike a regular cactus. He did take more nutrients for himself which killed the plants around him. Thankfully he is able to stay inconspicous as a disguised normal plant as well. And more luckily, he got taken by Flora one day to live in her garden instead, where he likes it a lot (if not for the other living plant that's totally evil).