This radish is white on the outside and pink on the inside-that makes them look like a bit like a watermelon! Bigger than your average radish, this is actually a Chinese heirloom related to Daikon radishes that can weigh up to one pound. Radishes are a cool season crop and this variety does best as late summer or early fall sown seed so it can ripen as the days grow shorter. Sow seed directly and be sure to thin your radishes! 65 days from seed to harvest.