Watermelon Naisy (KS 638) F1 is an early hybrid of the Crimson Sweet type, developed by breeders of Kitano Seeds from the Netherlands. The maturation period is approximately 65-68 days after transplanting seedlings, allowing for a quick harvest. The plant is long-vining, with a strong root system and well-developed leafy canopy, which effectively protects the fruit from sunburn. The hybrid exhibits high resistance to Fusarium and anthracnose, and can maintain fruit set under sharp daily temperature fluctuations and withstand short-term drought, making it easy to grow and adaptable to various climatic conditions. The fruit of Watermelon Naisy has a round-oval shape with smooth, striped dark green rind. The average fruit weight is 10-12 kg, with a maximum weight reaching up to 14 kg. The rind is moderately thick and dense, ensuring excellent transportability and storage durability. The flesh is bright red, firm, and crisp, with a uniform texture without voids. Sugar content reaches 11-12%, imparting high sweetness and appealing flavor. There is a minimal amount of seeds in the flesh, enhancing consumption convenience. Watermelon Naisy is widely used for fresh market sales due to its attractive appearance and excellent taste qualities. Additionally, it is suitable for canning, processing, and pickling, expanding its application potential. High fruit set even under stressful conditions and vigorous plant growth allow for a stable and high-quality harvest. All these characteristics make Watermelon Naisy an excellent choice for farmers and gardeners seeking reliable and profitable cultivation.