The Pumpkin Heavier Than a Car: How Does a Tiny Seed Get So Huge?
Summary
This October, giant pumpkins rolled onto the scales. One named Rocky won California's world championship at 2,389 pounds, and a Rhode Island pumpkin reportedly weighed about 3,150 pounds!
Transcript
0:00A Mystery Pumpkin
0:00Imagine a pumpkin so heavy it could flatten the scale in your bathroom like a pancake. Now imagine it started as a seed smaller than your fingernail! This October, pumpkin growers rolled out giants so huge that one of them reportedly weighed more than a car. 0:15A car! And here's the wildest part: that pumpkin did almost all of its growing in just one summer. So how does a tiny seed turn into something that needs a machine to lift it? That's our mystery today, and we're going to crack it clue by clue. 0:31But first, let's visit the place where giants get weighed.
0:35The Big Weigh-Off
0:35Welcome to a weigh-off! That's a contest where growers bring their biggest pumpkins and set them on an enormous scale. Everybody leans in. 0:43Everybody holds their breath. Then the numbers light up. In California, at a famous world championship, the winner was a pumpkin named Rocky. 0:53Rocky weighed two thousand three hundred eighty-nine pounds! And across the country, a grower in Rhode Island brought a pumpkin that reportedly weighed about three thousand one hundred fifty pounds. That's around one thousand four hundred thirty-two kilograms! 1:09Wow fact: that's heavier than some small cars, and about as heavy as two big cows standing side by side. So where did all that pumpkin come from? Our first clue is hiding inside a tiny seed.
1:23Clue One: Seed
1:23Take a close look at a giant pumpkin seed. It's flat, it's pale, and it's so light you'd barely feel it in your hand. But this seed has a secret. Giant pumpkin growers pick seeds from pumpkins that grew huge before. 1:36Each seed carries instructions inside it, like a tiny recipe book that says, 'Grow big. Grow fast. Keep growing!' Wow fact: lots of giant pumpkins turn out pale orange or even yellowish, not 1:50bright orange like the ones on your porch. In spring, growers tuck each seed into warm soil and wait. Soon a little green sprout pops up, wearing two round leaves like tiny wings. But don't let that sprout fool you, because it's about to start racing across the ground.
2:09Clue Two: Vines
2:09Pumpkin plants don't grow up tall like trees. They grow out, across the ground, in long green ropes called vines. A giant pumpkin plant can spread across a big part of a backyard, with leaves much wider than a dinner plate. 2:23Those leaves are like hundreds of green solar panels, all tilted toward the sun. Here's a sneaky wow fact: wherever the vine touches the soil, it can grow extra little roots. So the plant drinks from lots of spots at once, like one giant drink with many straws. All those leaves and all those roots are working together for one thing: 2:44feeding the pumpkin. But what exactly are they sending into it? Our next clue is something you drink every day.
2:52Clue Three: Water
2:52Clue number two: water! If you could peek inside a giant pumpkin, you'd find it's mostly water. In fact, about nine out of every ten pounds of a pumpkin is water. So a big chunk of Rocky is basically a giant orange water balloon with seeds inside! 3:09Growers give their plants lots of water, because a thirsty plant slows down. The water travels up from the roots, along the vine, and into the pumpkin through its thick stem. Wow fact: inside the vine are tiny tubes, like the straws in a juice box, 3:26carrying water all day long. But wait. If nine parts of the pumpkin are water, what's that last part made of? Hold that thought, because first, our pumpkin hits a growth spurt.
3:38The Growth Spurt
3:38One pumpkin plant can start lots of baby pumpkins. But giant pumpkin growers usually keep just one, and remove the rest. Why? So the plant sends all its food and water to that one lucky pumpkin. 3:51Then, in the middle of summer, things get totally bananas. Or should we say, totally pumpkins? A champion pumpkin can sometimes gain dozens of pounds in a single day! That's like you gaining the weight of a big backpack stuffed with books 4:06between breakfast and bedtime. Growers wrap a tape measure around their pumpkins to estimate how heavy they're getting. But here's the question that puzzled people for a very long time. 4:18Where does the solid part come from? Is the pumpkin eating the dirt?
4:23The Tree Test
4:23Most people guess the dirt. Plants sit in soil, so they must be eating it, right? Long ago, a scientist decided to test that idea with a tree. The scientist weighed some soil, put it in a big pot, and planted a small willow tree in it. 4:37For five years, the tree got only water. Then everything was weighed again. The tree had grown much, much heavier. But the soil? 4:44Wow fact: it had hardly lost any weight at all! So the tree wasn't eating the soil. And your pumpkin isn't either. Soil gives plants a few important helpers, kind of like vitamins, 4:57but not the big, heavy part. So here's the twist that changes everything: the solid part of a giant pumpkin comes mostly from... the air.
5:07Built From Air
5:07Yes, the air! Air holds an invisible gas called carbon dioxide. You breathe it out all day long. Pumpkin leaves pull that gas in through tiny holes. 5:17Then each leaf turns into a little sunshine kitchen. Step one: the roots send up water. Step two: the leaf catches sunlight. Step three: the leaf uses that sunlight to mix the water and the air together into sugar. 5:32That sugar flows down the vine and gets built into pumpkin! Scientists call this photosynthesis. A giant pumpkin is really air and water, stitched together by sunshine, packed into one lumpy orange ball. 5:47It's sunshine you can hug! Wow fact: when you breathe out near a pumpkin patch, you might be handing the plant a teeny, tiny building block. But building a giant out of air is only half the job. 5:59Keeping it safe is the other half.
6:02Pumpkin Royalty
6:02Growers treat their giant pumpkins like royalty. Some build shade covers over them, so the hot sun doesn't toughen the skin too fast. Many set the pumpkin on soft sand or padding, so its bottom stays comfy and dry. And they check them every day for cracks, because a pumpkin growing 6:20this fast can split its own skin! When weigh-off day arrives, nobody lifts it by hand. Growers use machines and special straps to gently raise it onto a truck. Wow fact: the biggest pumpkins often grow so wide and lumpy that 6:37they look more like a giant squished beanbag than a round little pumpkin. After all that care, it's finally time for the scale. So, what was really sitting on it?
6:48Back to the Scale
6:48Let's go back to that giant scale. The numbers flash: two thousand three hundred eighty-nine pounds for Rocky, and about three thousand one hundred fifty for the giant from Rhode Island. Now you know the secret: that seed smaller than your fingernail used long vines 7:05to drink water, big leaves to catch sunshine, and tiny leaf holes to pull in air, and in one summer it built something heavier than a car. So what was really on that scale? Mostly water and air, stitched together by sunshine, one day at a time. 7:22And here's a mystery for another day: a pumpkin seed can rest quietly in a dry packet for years, then sprout as soon as it's planted in warm, damp soil. How does a sleeping seed know when it's time to wake up?
Also in other languages
- हिन्दी: कार से भी भारी कद्दू! एक नन्हा बीज इतना बड़ा कैसे बना?
- संस्कृतम्: मोटरयानात् गुरुतरं कूष्माण्डम्! लघु बीजं कथं एतावत् विशालं भवति?
More videos
Series: science (English)