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.