Finally, a large yellow Heirloom watermelon that does great for our northern gardener friends! The Mountain Sweet Yellow Watermelon is a mid to large size melon that takes about 90 days from seed. You can transplant, but be careful with the roots. It's a great Heirloom melon seed that has been in northern gardens and farmers markets since the early 1900s. To our farmers market friends, this will give you a mid-summer boost! Happy growing!!!