20 Best Hokkaido Black Watermelon Seeds of 2023 – Romance University

After hours researching and comparing all models on the market, Romance University finds out the Best Hokkaido Black Watermelon Seeds of 2023. Check our ranking below.

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Rank No. #1

Densuke Watermelon Seeds Black Rind Bringht Red Flesh Crisp and Sweet Garden Outdoor 100Pcs Fruit Seeds by YEGAOL Garden

Start seeds indoors: Densuke watermelon seeds can be started indoors about 4-6 weeks before the last expected frost date in your area. Use a seed starting mix and keep the soil moist but not too wet.
Transplant seedlings: After the last frost date has passed, transplant the seedlings into a sunny location with well-draining soil. Space the plants about 6 feet apart in rows that are about 8 feet apart.
Water and fertilize: Water the plants deeply once or twice a week, depending on rainfall. Fertilize with a balanced fertilizer every 4-6 weeks.
Provide support: As the vines grow, they will need support to keep them off the ground. You can use trellises or stakes to support the vines.
Harvest: Densuke watermelons are typically ready to harvest about 85-90 days after planting. Look for a deep green color with distinct stripes and a yellow or cream-colored spot on the underside of the fruit. The fruit should also sound hollow when tapped.

Rank No. #2

100 Black Diamond Watermelon Seeds for Planting Heirloom Non GMO 14 Grams of Seeds Garden Vegetable Bulk Survival

Sweet Watermelon seeds garden seeds vegetable seeds bulk

SaleRank No. #3

25 Black Diamond Watermelon Seeds for Planting Non GMO Heirloom Seeds Instant Latch Fresh Fruit Garden Seed

Name: Black Diamond Watermelon Seeds | Botanical Name: Citrullus lanatus
Type: Heirloom | Size at Maturity: 50+ Pounds | Days to Maturity: 85 Days
Light Requirement:Full Sun | Planting Time:Warm Season
Sowing Method: Direct Sow | Planting Depth: 1" | Plant Spacing:36" | Hardiness Zones:All

Rank No. #4

50 Black Diamond Watermelon Seeds for Planting - Heirloom Non-GMO Fruit Seeds for Planting - Grows Big Giant Watermelons Averaging 30-50 lbs

Quintessential, King, Favorite, whatever you want to call it, this watermelon is popular for a reason!
This delicious watermelon averages 30-50 lbs, but sometimes gets as big as 75 lbs! Plants grow 12-18" tall.
In areas with shorter growing seasons it is best to start watermelon seeds indoors to get a head start. Plant 3 seeds per pot about 1/4" deep and provide heat to about 80 degrees to increase germination.
Ensure soil does not dry out due to heat. Seeds should germinate in 1-2 weeks. After seeds have germinated thin to one per pot. Make sure to acclimate plants to the outdoors for several days prior to transplanting to harden them off.
To sow directly in garden plant 5 seeds per hill 1' apart with 4' between rows. Requires healthy amounts of water and warm temperatures. Black plastic on soil can aid in warming soil.

Rank No. #5

50 Black Diamond Watermelon Seeds for Planting Heirloom Non GMO 7 Grams of Seeds Garden Vegetable Bulk Survival

Sweet Watermelon seeds garden seeds vegetable seeds bulk

Last update on 2025-07-09 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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FAQ:

Q: What is a black watermelon?

A: The watermelon is black in color, crisp, and hard, with a different level of sweetness than other watermelons. It also has very few seeds. This fruit is grown exclusively on Hokkaido, and it’s produced in limited quantities, which puts them in high demand and at high prices.

Q: What is the most expensive watermelon ever sold in Japan?

A: TOKYO A jumbo black watermelon auctioned in Japan on Friday fetched a record $6,100, making it one of the most expensive watermelons ever sold in the country. In a society where melons are a luxury item commonly given as gifts, the watermelon’s hefty price tag followed another jaw-dropping auction last month.

Q: How much does a Densuke watermelon cost?

A: The price was the highest on record for a Densuke watermelon, said Kazuyoshi Ohira, a spokesman for the Tohma Agricultural Cooperative in Hokkaido. Most retail at department stores and supermarkets for a more modest $188 to $283, Ohira said.

Q: How much would you pay for a watermelon?

A: In a society where melons are a luxury item commonly given as gifts, the watermelon’s hefty price tag followed another jaw-dropping auction last month. At that auction, a pair of “Yubari” cantaloupe melons sold for a record $23,500.

Hokkaido Black Watermelon Seeds