1. The first will be near the entrance to
Hollow Oak between the first two dungeons.
2. The second is northwest of the first like the picture suggests. It is by the hat which may also be linked to Charlie's Hat quest.
3. Travel northeast from there to locate the rose by the spear. The spear is needed for Warrior's Requiem quest.
4. Continuing northeast will take you to the final rose just beside the
Hollow Oak.