80-90 Days to maturity. Crimson Sweet Organic Watermelon Seeds. Open-pollinated, heirloom, heat tolerant, seeded, picnic watermelon. Resistant to Anthracnose (1,3), Fusarium Wilt (Race 1,2). Crimson Sweet watermelon seeds deliver one of the most iconic and delicious fruits of the summer garden. Ready to harvest in about three months and averaging 25 lb melons, Crimson Sweet seeds produce a classic dark green flesh with sweet and crunchy red meat. Watermelon is one of the easiest crops to maintain, just keep it watered and in full sun up until harvest.