Thai Giant Euphorbia Crimson Splash has large, 1-2 flowers with white petals and crimson red splashes throughout the petals. Its a prolific bloomer with the flowers appearing in clusters during the spring and summer blooming season. Euphorbias are indestructible houseplants that thrive on neglect. Be sure to let the soil dry out between waterings. This easy-care plant will thrive on a sunny windowsill or grow it outside during the warm summer months.