GrowingWatermelon in Containers From Seed to Harvest | How to growwatermelon, Container gardening fruit, Container gardening vegetables. A watermelon harvest from 20 gallon containers planted 10 weeks ago is a great way to celebrate summer. The benefits of growingwatermelons in containers. You can control the amount of space it occupies and also the amount of water. Watermelons like consistent watering. Once you have selected the containerwatermelons you will grow, place the seed into the soil. The seed should be plant 3 times deeper than it is long. GrowingWatermelon in a Container Loving Me - Janine. Growingwatermelon in containers Homestead - John Smith. 318. stephg114. The benefits of growingwatermelon in containers. Aside from saving space, there are several other reasons why growingwatermelon in pots is a smart idea. My first attempt to growwatermelons in containers yielded a plant that had a couple of 12 foot vines and several shorter offshoot vines and over its lifespan it produced a dozen female... GrowingWatermelon in a Pot. Obtaining a Large Container. An old washtub, 5-gallon bucket or similar-sized container will do for a watermelon plant. ContainerGrowingWatermelons. Share on Facebook.While watermelons can be grown in pots as small as 5 gallons, we recommend containers with a capacity of 7 gallons or more. When growingwatermelon in containers, you’ll need to water the plant every day and sometimes twice in a warm day. Once the fruits start to swell up and mature, reduce the watering.