Blossom Blossom is one of the items in the Genshin Impact that is needed to level up certain characters. You will also need a blood flower to place it on simple tombs.
Bloodbloom location map
These flowers grow on the islands of Yashiori and Kannazuka in Inazuma. The first place you'll find some of these is in the area northwest of Kojo Camp in Kannazuka.
Most of the blood flowers grow on Nazuchi Beach, which is the link between Yashiori and Kannazuka. But, if you want to go to the west of Inazuma, then first you need to destroy the barrier in Tatarasun as part of the "Tales from the Tatara" quest.
The last place where the plants were discovered is in the south of Yasiori Island near the Head of the Serpent.
