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Black Diamond Watermelon

Gardening Guide: Wonderful Watermelon: How to Grow the Fruit that Means 'Summer'

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Black Diamond Watermelon

In this Plant Profile, get specific details, including the characteristics and best uses of Black Diamond Watermelon, one of our Plant Profiles featured in our Watermelon Collection.

By Norann Oleson

Black Diamond watermelons

Black Diamond watermelons

Black Diamond is an heirloom, open-pollinated variety, and a popular choice for both commercial and home growers for many reasons. Mature melons have very hard, dark-colored rinds and sweet, pink-red flesh. Try to scratch this one with a fingernail to find out if it’s ripe. If it’s too hard to scratch, you’re ready to go.

Sun Exposure

  • Full sun

Soil pH

  • 6.5 to 7.5

Hardiness Zones

  • not frost hardy

Spacing

  • Vines need 3 to 5 feet of space

Moisture

  • Water deeply 1 to 2 inches per week
  • keep soil moist but not waterlogged

Notes

  • 75 to 90 days to harvest
  • Open-pollinated
  • Seeded
  • Flesh is red
  • Weighs 50+ lbs.

Have you grown Black Diamond watermelons? If so, tell us your top tips for ensuring a delicious harvest.

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TABLE OF CONTENTS

  • Curator’s Corner
  • Introduction
  • Feature Articles

  • Types of Watermelon Plants
  • Pollinating Watermelon Plants
  • Choosing the Right Variety of Watermelon
  • Growing Watermelon from Seeds or Seedlings
  • Growing Watermelon in Open Land, in Raised Beds, or on a Trellis
  • Soil, Sunlight, Fertilizer, and Water for Your Watermelon Plants
  • Watermelon Care: Pests and Disease
  • Harvesting Your Watermelons
  • Essential Tools and Equipment for Growing and Enjoying Watermelons
  • Plant Profiles

  • Desert King Watermelon
  • Black Diamond Watermelon
  • Yellow Doll Watermelon
  • Crimson Sweet Watermelon
  • King of Hearts Watermelon
  • Sugar Baby Watermelon
  • Recipes

  • Grilled Watermelon Salad
  • Fresh Mozzarella Watermelon Salad
  • Watermelon Rind Smoothie
  • Watermelon Fruit Rollups
  • Margarita Watermelon
  • Watermelon Juice
  • Easy Watermelon Sorbet
  • Grilled Watermelon and Pineapple Skewers
  • Additional Articles

  • Nutrition Facts about Watermelon
  • Home Remedies and Health Benefits of Watermelon
  • Resources about Watermelon
  • Watermelon Glossary
  • Related Articles

  • Start Growing Watermelon in Raised Beds
  • Wonderful Watermelon: How to Grow the Fruit that Means ‘Summer’

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