Rare Black Diamond Watermelon Seeds Non-GMO, Organic, Heirloom B10

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  • Regular price $3.49

Black Diamond Watermelon Seeds. 90 Days to harvest. Annual, Heirloom, Non-GMO, Open Pollinated. Citrullus lanatus. Developed in Arkansas in the 1950s. Called black diamond because of its deep, dark green skin, it contrasts beautifully with intensely bright red flesh.

Black diamond watermelons are known for their enormous size and their juicy, sweet flesh. This heirloom variety is popular for home gardens as well as large, commercial farms. The dark, blue-green-black melons have rich red flesh. and typically lack the usual stripes of more familiar watermelon varieties. The melons, which can easily weigh up to 50 pounds, require a long growing season to produce mature fruit.

Black Diamond is an open-pollinated heirloom watermelon variety. For many years, commercial and home growers have preferred Black Diamond watermelons for a variety of reasons. Watermelon plants from the Black Diamond variety have vigorous vines that produce fruits that can weigh up to 50 pounds (23 kg.)

Count: 10
Latin Name: Citrullus lanatus

Botanical Name Citrullus lanatus ‘Black Diamond’ Common Name Black Diamond Watermelon Plant Type Annual Mature Size vines can be 20 ft. long Sun Exposure Full Soil Type Loamy, Sandy, Moist but Well-drained Soil pH Acidic, Neutral Bloom Time Summer Flower Color Yellow Hardiness Zones 3-9, USA Native Area North America

Days to Maturity: 90 Days - Annual Crop - Not Intended to Over-winter - All Zones in the U.S.A Germination Rate: High " Open Pollinated Seed Quality: Non-GMO - Heirloom - Premium Seeds

90 days. Citrullus lanatus. Fresh Cal Sweet seeds are more durable and can tolerate different climates. However, be sure to allow your heirloom melons to soak up the summer sun, as all successful watermelon crops thrive in the heat. Watermelons are also packed with rich antioxidants such as lycopene. As an AAS winner, Cal Sweet Watermelons placed in 2019 as the prestigious and edible-vegetable variety!

GARDEN HINTS: For early fruiting and to overcome a short growing season, plants may be started indoors in peat pots. Water during hot, dry periods.


Growing Tips: Direct seed, or set out indoor-started transplants after last frost date when really warm weather has arrived. Needs rich soil (amend with compost) and plenty of moisture.

Sowing & Growing: Sow Cal Sweet Watermelon seeds in pots, 4-6 before your region"s final frost. Plant non-GMO watermelon seeds 1" deep in quart containers and in potting soil that is well-drained. Germination will take 3-10 days. Place Cal Sweet seedlings in a sunny location and keep soil moist. Once the young watermelon sprouts have developed their first set of true leaves, transplant to their permanent home. To grow Cal Sweet Watermelons on your deck, plant 3 seeds per quart pot and later thin down to your strongest 1-2, as this bush variety won"t spread like other watermelons and produces 2-3 melons per plant. Use a fertile soil that is well-draining and has a pH level of 6.0-7.0. Directly sow seeds once your region has remained warm and at least 70ž°. Place in a location where the watermelons will receive plenty of heat and plant in raised hills. Sow Cal Sweet Watermelon seeds 1" deep, 1-2" apart and with 5-6" spaced in between hills. Water regularly until you see fruit begin to produce on the vines, then ease up on watering to help the summer conditions ripen your watermelon crop. It"s recommended to use row covers in order to protect the Cal Sweet Watermelon plants outdoors.

Harvesting: You can harvest your non-GMO Cal Sweet Watermelon seeds around 90 days from the sowing date or once the underside of the fruit has turned a yellow color and is depleted of a green-colored stem. Wait for the main vine and coils attached near the stem to dry out. Unlike other melon varieties such as cantaloupe, watermelons won"t fall off the primary spreading vine by themselves. Harvest your ripe heirloom watermelon crop with gardening shears by cutting the fruit near the stem. Rinse off your Cal Sweet Watermelons and soak up all their bright and diverse recipes. The fresh fruit of Watermelon offers a variety of flavor when paired with something savory or mixed in a salad. Some adventurous gardeners even pepper their watermelon with chili powder or salt!

Facts: This Citrullus lanatus Cal Sweet variety is easy to carry as a picnic-sized melon. Watermelons are not only rich in lycopene, they produce high amounts of vitamin C!

FREE GIFT when you order 5 items or more. Free gift is full of surprise seeds which may include single or mixed varieties.

Note: No tracking # will be provided to make the shipping cost-effective for us and free for you. Returns & exchanges Not accepted. But please contact me if you have problems with your order