Pa Hin Ngam National park has the area that is full of green 112 square kilometers, has many kinds of plants, and the place to see the beautiful plants in the national park. There are two places that have different kinds of plant, the first is the place where you also can see the view that has a lot of trees called "Sut Phaendin" and the second is the place that has the most beautiful flower in the national park called "Bua Sawan Field".
Dok Kra Jiao or Bua Sawan Field (ทุ่งดอกกระเจียว หรือ ทุ่งบัวสวรรค์) Kra Jiao, a kind of curcuma, is an annual plant in the same species as ginger-galingale, scattered generally from Lan Hin Ngam to the Sut Phaendin viewpoint. Near the viewpoint is one of the fields of the Siam tulip (Curcuma alismatifolia), called "Dok Kra Jiao" (ดอกกระเจียว) in Thai. The dipterocarp forests bloom with the purple flowers at the beginning of the rainy season in July.