Watermelon seeds: What's the difference between the white and black ones?

Answers to your questions about the news.
July 29 2011 12:03 PM

What's With White Watermelon Seeds?

They're just immature.

See our Magnum Photos watermelon gallery

Watermelon. Click image to expand.
What's with the different-colored seeds?

Watermelons, as anyone who's ever eaten one has likely noticed, contain both small white seeds and larger black ones. Seeing as it's watermelon season, the Explainer thought she'd answer the terribly pressing question: What's the difference between the seeds?

Maturity. All watermelon seeds start off small and white before growing into larger black, red, tan, or dotted seeds. (More on these less-familiar colors later.) The average American watermelon has about 200 to 800 seeds, and roughly 5 percent of those are still immature upon harvest. These seeds are infertile, so unlike their black cousins, you can't use them to plant your own crop of watermelons.

Undeveloped seeds should not be confused with seeds from white-seeded watermelons, which are very common in China and the Middle East (not so much here). American farmers tend to produce watermelons of the black-seeded variety for aesthetic reasons, but watermelons have a vast array of gene combinations that can produce a variety of seed, rind, and flesh colors.

Advertisement

Along with squash, cucumber, cantaloupe, and pumpkin, watermelons are members of the cucurbit family, which produce fruits called "pepo"—modified berries with thick rinds and a fleshy center. While all cucurbits start out with white seeds, watermelons are the only ones with seeds that can then change into various colors.

Despite the childhood myth that swallowing watermelon seeds will cause you to grow a watermelon inside your stomach, all watermelon seeds—mature and immature—are perfectly edible. Some speculate that if you swallow a whole seed it could get stuck in your intestines, but chewing it up a bit will solve that problem. Watermelon seeds are filled with vital nutrients that can give you a large dose of your day's recommended protein intake.

Bonus Explainer: Why do "seedless watermelons" have seeds?They only look like they do. Seedless watermelons are sterile hybrids, but they sometimes contain little hard seed coats. If you look inside of these, you'll find that they're completely empty.

Got a question about today's news? Ask the Explainer.

Explainer thanks Stephen King of Texas A&M and Todd C. Wehner of North Carolina State University.Thanks also to reader Robert Fung for asking the question.

Brahna Siegelberg is a Slate intern.

TODAY IN SLATE

Politics

The Irritating Confidante

John Dickerson on Ben Bradlee’s fascinating relationship with John F. Kennedy.

My Father Invented Social Networking at a Girls’ Reform School in the 1930s

Renée Zellweger’s New Face Is Too Real

Sleater-Kinney Was Once America’s Best Rock Band

Can it be again?

The All The President’s Men Scene That Captured Ben Bradlee

Medical Examiner

Is It Better to Be a Hero Like Batman?

Or an altruist like Bruce Wayne?

Technology

Driving in Circles

The autonomous Google car may never actually happen.

The World’s Human Rights Violators Are Signatories on the World’s Human Rights Treaties

How Punctual Are Germans?

  News & Politics
The World
Oct. 21 2014 11:40 AM The U.S. Has Spent $7 Billion Fighting the War on Drugs in Afghanistan. It Hasn’t Worked. 
  Business
Moneybox
Oct. 21 2014 5:57 PM Soda and Fries Have Lost Their Charm for Both Consumers and Investors
  Life
The Vault
Oct. 21 2014 2:23 PM A Data-Packed Map of American Immigration in 1903
  Double X
The XX Factor
Oct. 21 2014 1:12 PM George Tiller’s Murderer Threatens Another Abortion Provider, Claims Right of Free Speech
  Slate Plus
Behind the Scenes
Oct. 21 2014 1:02 PM Where Are Slate Plus Members From? This Weird Cartogram Explains. A weird-looking cartogram of Slate Plus memberships by state.
  Arts
Behold
Oct. 21 2014 12:05 PM Same-Sex Couples at Home With Themselves in 1980s America
  Technology
Future Tense
Oct. 21 2014 4:14 PM Planet Money Uncovers One Surprising Reason the Internet Is Sexist
  Health & Science
Climate Desk
Oct. 21 2014 11:53 AM Taking Research for Granted Texas Republican Lamar Smith continues his crusade against independence in science.
  Sports
Sports Nut
Oct. 20 2014 5:09 PM Keepaway, on Three. Ready—Break! On his record-breaking touchdown pass, Peyton Manning couldn’t even leave the celebration to chance.