Square watermelons are becoming more and more popular for their quirky and unique shape, but many people are not sure how to grow them. Here are some steps to successfully grow a square watermelon.

1. Choose the Right Variety
Not all watermelons can be grown into a square shape. The variety called “Densuke” is the most commonly used type for square watermelons because it has a naturally square shape. If Densuke is not available or too expensive, you can also try growing other square-ish varieties such as “Sugar Baby” or “Blacktail Mountain”.

2. Build a Square Mold
To grow a square watermelon, you will need to make sure it grows in a square mold. You can construct a mold using plywood or plastic, but make sure it is sturdy enough to support the weight of the growing watermelon. Measure out the size of the watermelon you want to grow and cut the mold panels accordingly. Nail or staple the panels together to create a cube.

3. Prep Your Soil
The soil you choose is extremely important for growing healthy watermelons. Choose a location with ample sunlight and rich soil that is well-draining. Make sure that the soil is as level as possible to prevent the watermelon from being deformed. If needed, amend the soil with organic matter such as compost or manure, as watermelons require a lot of nutrients to grow.

4. Plant Your Seeds or Seedlings
Sow your seeds about 1 inch deep and be sure to space them at least 6 inches apart. If you prefer, you can also use seedlings, but make sure they are transplanted into the soil at the same depth as their pot.

5. Train the Vine
As the watermelon grows, make sure to train the vine to grow into the mold by gently guiding it in that direction. You can use soft twine to tie the vine to the inside of the mold.

6. Remove Extra Fruit
Watermelons are known for producing multiple fruits on a single vine, but for square watermelons, it’s important to remove all but one fruit per vine to allow for better growth and to ensure the square shape.

7. Monitor for Pests and Diseases
As your watermelon grows, keep an eye out for common pests such as aphids and cucumber beetles. Using natural pesticides and preventative measures such as rotating crops can help prevent infestations. In addition, watch for signs of disease such as powdery mildew or fusarium wilt, which can quickly spread and cause your watermelon to prematurely rot.

8. Harvest at the Right Time
When your watermelon has fully matured, usually after about 75-85 days, it’s time to harvest. The best way to determine if your watermelon is ripe is by tapping on it – if it sounds hollow, it’s ready. Cut the stem of the watermelon with garden shears or scissors and carefully remove it from the mold.

Growing square watermelons requires patience and dedication, but it can be a fun and rewarding experience. Follow these steps and you’ll be well on your way to growing your own quirky and unique square watermelon.

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