TIMES MALAYSIA, JAKARTA – Black watermelons are a unique and intriguing variety of watermelon, distinguished by their dark, often near-black rinds and sweet, vibrant red flesh. Among the most notable types is the 'Black Diamond' watermelon, an heirloom variety that has been cherished by gardeners and consumers alike.

'Black Diamond' watermelons are renowned for their large size, with fruits typically weighing between 35 to 50 pounds. Some even reaching up to 75 pounds under optimal conditions.

They feature a thick, dark green to black rind that is both tough and bruise-resistant, making them suitable for transport and handling. The flesh inside is bright red, tender, crisp, and exceptionally sweet, offering a delightful contrast to the dark exterior.

Cultivation Practices

Growing 'Black Diamond' watermelons requires a long, warm growing season, as they typically take about 90 days to reach maturity. They thrive in sunny locations, requiring at least 6 to 8 hours of direct sunlight daily, and prefer fertile, well-drained soils rich in organic matter.

Soil temperatures should be at least 70°F (21°C) for optimal seed germination. Planting is usually done by sowing seeds directly into the garden 1 to 2 weeks after the last frost, with seeds placed 1 inch deep and spaced appropriately to accommodate the vigorous vine growth.

Mulching with organic materials, such as straw, can help retain soil moisture and regulate temperature. Consistent watering is crucial, especially during the fruit development stage, but it's important to reduce watering as the fruit nears maturity to enhance sweetness.

Utilizing black plastic mulch can also be beneficial, as it warms the soil more quickly in the spring, conserves moisture, controls weeds, and reduces fruit rot.

Historical and Cultural Significance

In the 1950s, 'Black Diamond' watermelons were a very popular home garden variety. Their large size and sweet flavor made them a favorite among home gardeners and market growers.

In December 2024, a significant advancement in black watermelon cultivation was achieved in Indonesia. Astrid Ika Paramitha, a lecturer at the Agrotechnology Department, Faculty of Science and Technology, Universitas Islam Raden Rahmat (Unira) Malang, successfully developed a new variety of black-skinned melon.

"It through nearly two years of genetic experimentation," Astrid said. This marks the first-ever discovery of such a melon in Indonesia, expanding the diversity of black watermelon varieties available to consumers and farmers.

Black watermelons, particularly the 'Black Diamond' variety, continue to captivate with their striking appearance and delectable taste. Ongoing research and cultivation efforts, such as those in Indonesia, promise to introduce even more diversity and options for enthusiasts of this unique fruit. (*)