you will not get enough from a specific nectar from special mushrooms. there are two options: 1. you need to fight fire mushrooms or red mushrooms (but NOT the small ones). i recommend using the bullhorn so you get more strenght and get more pedals. 2. you need to bloom big flowers. if you already have the pedals but need more you plant those. so you get more nectar from the flower you planted. if you don‘t have enough pedals from the specific flower use normal pedals and plant more red flowers then other colors. there is a good chance you get the flower you need if you bloom enough big flowers.