The tendrils that are normally bright green near where the watermelon meets the stem will turn brown. Tips from An Experienced Farmer on How to Pick a Good Watermelon 1 Look for the Field Spot 2 Look for webbing 3 Boy and Girl Watermelons 4 Pay Attention to the Size 5 Inspect the Tail. Growing And Harvesting Watermelon Farmfoodfamily How To Grow Watermelon Watermelon Farming Watermelon Plant Different varieties will take different amounts of time to reach maturity so be aware of the Days to Maturity listed on the seed packet. When to pick watermelon from garden . Picking the Perfect Watermelon. Small watermelons such as sugar babies take less time to fully ripen 70-75 days than larger ones such as Queen of Hearts 80-85 days. At about the 75-day mark start keeping your eye on it to see if it is ripe looking for the following clues. The most important thing to look for though is the little squiggly tendril next to the stem. Early 65-days mid-season 80-days and. The watermelo...