Container Plant Information: Watermelon

How To Grow

1. Select a Large Container: Choose a large container that is at least 10 gallons in size and has drainage holes at the bottom to prevent waterlogging. Half barrels or large plastic containers can work well.
2. Choose a Compact Variety: Opt for a compact or dwarf variety of watermelon, such as “Sugar Baby” or “Bush Sugar Baby,” which are more suitable for container growth.
3. Prepare the Container: Fill the container with a well-draining potting mix enriched with compost or aged manure to provide nutrients. Ensure the container is placed in a location that receives full sunlight.
4. Plant Watermelon Seeds: Plant watermelon seeds directly into the container, following the planting depth and spacing recommendations provided on the seed packet. Watermelon seeds require warm soil temperatures to germinate, so wait until the soil has warmed up before planting.
5. Water Regularly: Keep the soil consistently moist throughout the growing season, especially during hot and dry periods. Watermelons have shallow roots, so frequent watering is essential to prevent the soil from drying out.
6. Provide Support: As the watermelon vines grow, provide support such as trellises or stakes to help them climb and prevent sprawling. You can also use a tomato cage to support the vines.
7. Fertilize Sparingly: Fertilize the watermelon plants sparingly with a balanced fertilizer diluted to half strength every 4-6 weeks during the growing season. Avoid over-fertilizing, as it can lead to excessive foliage growth at the expense of fruit production.
8. Monitor for Pests and Diseases: Keep an eye out for common pests such as aphids, cucumber beetles, and spider mites, as well as diseases like powdery mildew and anthracnose. Treat any issues promptly to prevent them from spreading.
9. Harvest: Watermelons are typically ready for harvest 70-90 days after planting, depending on the variety. Harvest the watermelons when they reach full size and have a dull, slightly yellow underside. Cut the watermelons from the vine using a sharp knife or pruning shears.

Check out our detailed guide to grow watermelon in a container.