Start with Hybridized Seed
Several kinds of hybridized watermelon seed on the market will develop exclusively into yellow flesh watermelon when planted. All types' size and development timetable vary only slightly between them and all will produce yellow flesh watermelons weighing between six and eight pounds. Yellow flesh seeds include Yellow Baby, Honey Heart and Yellow Doll cultivars.
Planting & Growth Cycle
Watermelons, a vegetable native to Africa, are best grown from seeds planted in the warm spring garden or vegetable patch after all threat of frost has passed and the soil has warmed. Bury seeds an inch deep in moist, nutrient rich soil at intervals of at least two feet apart and allowing seven or more feet between each row of seeds. Thin the young plants leaving the healthiest plant standing every three to six feet. Seeds will germinate within two weeks and the young plants will produce blooms. Yellow flesh watermelons develop on the same timetable as red flesh watermelons at anywhere from 70 to 85 days after the flowers are pollinated.
Ripeness & Harvest Time
The ripeness of yellow-flesh watermelons, like their red cousins, can be physically observed in addition to watching the calendar days. Watermelons are ripe when the curly green vine tendrils turn brown and desiccate, the watermelon skin dulls, the skin toughens and the soil side belly of the watermelon has faded to pale greenish white or yellow. When it shows several or all of those markers the yellow flesh melon can be cut from the vine and eaten or sent to market.