Crimson Sweet Yellow Watermelon Seeds (Picnic Variety)
Crimson Sweet YellowWatermelon — Heirloom Seeds
Citrullus lanatus | 80 Days | Open-Pollinated
Everything you love about a classic summer watermelon — with a surprise waiting inside.
The Crimson Sweet Yellow is a yellow-fleshed mutation of one of the most celebrated watermelons ever developed. The original Crimson Sweet was bred at Kansas State University in 1963 from a cross between the Miles/Peacock and Charleston Gray varieties, and went on to win an All-America Selections award in 1964. It became the watermelon that all other watermelons are measured against — crisp, intensely sweet, and reliable enough for both backyard gardens and commercial fields. The yellow-fleshed version carries all of that same DNA and dependability, with one stunning difference: crack open that familiar striped green rind and instead of red, you'll find brilliant, glowing yellow flesh that stops people in their tracks.
The flavor is something most people don't expect. Yellow-fleshed watermelons tend to register as sweeter and more complex than their red counterparts — less sharp, with a smooth honeyed sweetness that lingers. At around 20 pounds per fruit, it's the perfect size for a summer gathering, a farmers market table, or a backyard cookout where you want to give people something to talk about. Slice it and set it out next to a red watermelon and watch what happens.
The vines are vigorous and naturally resistant to both anthracnose and fusarium wilt, two of the most common watermelon diseases. This is a forgiving, productive variety that performs well across a wide range of climates, making it just as well-suited to the Deep South as it is to northern gardens with shorter growing seasons.
Classic roots. Unexpected color. Unforgettable flavor.
When to Plant Like all watermelons, the Crimson Sweet Yellow demands warmth from the ground up. Wait until after your last frost date and until soil temperatures have reliably climbed above 70°F before direct sowing. For gardeners in shorter-season climates, start seeds indoors 3–4 weeks before your last expected frost — but no sooner, as watermelon roots don't take well to being confined in small containers for extended periods.
Starting Indoors Sow seeds about half an inch deep in individual biodegradable pots to avoid disturbing the roots at transplant time. A heat mat keeping soil temperatures between 80–90°F will dramatically speed germination; expect sprouts in 5–10 days. Once true leaves appear, thin to the strongest seedling per pot. Harden transplants off outdoors over 5–7 days before moving them to the garden, and water thoroughly after planting.
Direct Sowing Sow 2–3 seeds per spot, half an inch to an inch deep, spacing spots 18–36 inches apart in rows 6–8 feet apart. Once seedlings develop true leaves, thin to the single strongest plant per location. In hill planting, space hills 6 feet apart and thin to one or two plants per hill.
Soil & Sun Full sun is essential — aim for at least 8 hours of direct light per day. Watermelons prefer loose, well-draining soil with a pH between 6.5 and 7.5. A light, sandy loam amended with compost before planting gives the roots room to push and the plants a strong nutritional foundation. Raised beds and mounded hills are worth considering — they warm up faster in spring and drain well after heavy summer rains.
Watering Water consistently and deeply at the base of the plant, keeping moisture even throughout the growing season. The most critical windows for watering are during vine development and while fruits are actively sizing up. Once the fruits have reached full size and are beginning to ripen, pull back on watering — too much moisture in the final stretch can dilute the sugars that make this melon special.
Feeding Work a balanced organic fertilizer into the bed before planting. Once vines begin to run, switch to a lower-nitrogen feed that encourages fruit development over excessive leaf growth. Side-dress again lightly once fruits begin to set.
Harvesting The Crimson Sweet Yellow is ready to pick when the small curling tendril closest to the fruit's stem has dried completely and turned brown, and the pale patch on the melon's underside has deepened from white to a warm yellow or cream. A dull thud rather than a sharp, high-pitched ring when you thump it is another reliable sign. Unlike tree fruits, watermelons do not continue ripening after harvest — wait until they're ready before cutting the stem.
Saving Seeds Being open-pollinated, this variety comes true from seed and is well worth saving. Scoop seeds from a fully ripe melon, rinse away all of the flesh, and spread them on a screen or paper towel to dry for at least two weeks away from direct sunlight. Store in a cool, dry, airtight container. Expect strong germination for up to five years. Keep this variety isolated from other watermelons if you want pure seed.