Flower power

Okay so I could have sworn I bookmarked it but I can’t find the story or Remember the title. I remember Harry magic was different he could use plants to do spells iy was basically dark magic I believe, he was either able to do spells ober powdered or not at all, each plant able to affect spells or potions in different ways i remember he even did one for the patronus spell and made one that had the affects of the dementors then later other emotions. I remember others not really paying him any mind, to them he was just a squib who got lucky and was able to cast a few overpowered spells but not that many