There is purple-heart pitaya. I have eaten it. It tastes sweeter than white-heart pitaya and has richer nutritional value. Dark fruits like purple-heart pitaya generally have higher carotene content, which protects the eyes. The fibrous part of the crystal and so on. Especially the imported red dragon fruit from Vietnam has the best quality, but of course the price will be more expensive. Large fruit shops should sell purple heart dragon fruit.