The Siam Tulip, or "Heavenly Lotus," at Phu Pha Lek National Park in Sakon Nakhon Province begins to bloom, displaying its vibrant pinkish-purple color during the early rainy season, from June to August each year. It blooms profusely across the fields amidst the mist and lush green deciduous forest, making it a beautiful and unmissable tourist highlight during this time.