Updated: July 16, 2023

Introduction

Watermelons are delicious and refreshing fruits that are perfect for summer. While they are often grown in large gardens, it is also possible to grow them in pots, making it a suitable option for those with limited space. In this guide, we will explore the steps and requirements for successfully growing watermelon plants in a pot.

Choosing the Right Pot

When growing watermelon in a pot, it is crucial to choose the right container. A large pot with a minimum diameter of 18 inches is recommended to accommodate the plant’s root system. Additionally, ensure the pot has proper drainage holes to allow excess water to escape. Using a container with wheels can be beneficial for moving the plant around to maximize sunlight exposure.

Selecting the Perfect Variety

Not all watermelon varieties are suitable for growing in pots. Look for compact or dwarf varieties that are specifically bred for container gardening. Some great options include “Sugar Baby” and “Bush Sugar Baby,” which produce small-sized fruits that are ideal for smaller spaces. These varieties also have shorter vines, making them easier to manage in containers.

Preparing the Potting Mix

Watermelons thrive in well-draining soil with plenty of organic matter. Prepare a potting mix by combining equal parts of garden soil, compost, and peat moss or coconut coir. This mixture provides the right balance of nutrients and moisture retention for healthy watermelon growth. Avoid using regular garden soil alone, as it tends to become compacted in containers.

Planting Watermelon Seeds

Watermelon seeds can be directly sown into the pot or started indoors in biodegradable pots before transplanting. If planting directly into the pot, sow two to three seeds per pot at a depth of one inch. Once the seedlings emerge and develop their first set of true leaves, thin them out to leave only the strongest seedling.

Providing Optimal Growing Conditions

Watermelons require plenty of sunlight to thrive. Choose a sunny spot for your pot, preferably where it can receive at least six to eight hours of direct sunlight daily. If you are growing watermelon indoors, consider using grow lights to supplement natural light.

Watermelons also need warm temperatures to grow successfully. Ensure the plants are exposed to temperatures between 70°F to 85°F (21°C to 29°C) during the day and above 60°F (15°C) at night. If the temperature drops below these levels, consider using a plant cover or bring the pot indoors temporarily.

Watering and Fertilizing

Watermelon plants have high water requirements, especially during hot and dry periods. Water the plants thoroughly, ensuring the soil is evenly moist but not waterlogged. Check the moisture level by inserting your finger into the soil up to your knuckle; if it feels dry, it’s time to water.

Fertilize the watermelon plant every two weeks with a balanced liquid fertilizer. Alternatively, you can incorporate slow-release granular fertilizer into the potting mix when initially planting the seedlings. Follow the package instructions for proper application rates.

Supporting and Training Vines

As watermelon plants grow, they develop long vines that need support. Use trellises or stakes to provide guidance for the vines. Gently tie the vines to the support structure using soft garden twine or plant ties. This helps prevent them from sprawling on the ground, reducing the risk of pests and diseases.

Pollination

Watermelons require pollination for fruit set. In outdoor settings, bees and other pollinators take care of this task. However, when growing watermelon in pots indoors, manual pollination may be necessary. Use a small paintbrush or cotton swab to transfer pollen from male flowers (those without a swelling at their base) to the female flowers (those with a small swelling that resembles a miniature fruit).

Harvesting Watermelons

Watermelons are ready for harvest when the fruit’s skin becomes dull and hard, and the tendril closest to the fruit turns brown. The fruit should also produce a hollow sound when tapped. Use a sharp knife or pruning shears to cut the watermelon from the vine, leaving a short stem attached.

Conclusion

Growing watermelon plants in pots is an excellent option for those with limited space or who prefer container gardening. By choosing the right pot, selecting suitable varieties, and providing optimal growing conditions, you can enjoy homegrown watermelons right from your patio or balcony. Follow the steps outlined in this guide, and soon you’ll be relishing in the sweet taste of your very own watermelon harvest.