How Do You Know When A Watermelon Is Done Growing

You know a watermelon is done growing when the tendril closest to the fruit turns brown and dries up.
 
That little curly vine is nature’s signal that the melon has reached its full size and is ready to finish ripening.
 
But figuring out when a watermelon is done growing involves more than just one clue.
 
If you’ve been asking yourself how do you know when a watermelon is done growing, you’re in the right place.
 
In this post, we’ll walk through the signs that tell you when a watermelon is done growing, how to check ripeness, and what happens if you pick too early or too late.
 
Let’s dive in.
 

How Do You Know When a Watermelon Is Done Growing?

Knowing when a watermelon is done growing comes down to watching a few key indicators on the vine and on the fruit itself.
 
Here’s how to tell.
 

1. The Tendril Test

The most reliable sign that a watermelon is done growing is the tendril nearest to the fruit.
 
When that tendril turns brown and shrivels, the watermelon has stopped growing and is focusing its energy on ripening.
 
If the tendril is still green, the melon is still growing and needs more time on the vine.
 
This single test is often all you need to know when a watermelon is done growing.
 

2. The Ground Spot Turns Creamy Yellow

Flip the watermelon over and look at the spot where it rested on the ground.
 
If that spot is white or pale green, the watermelon is still growing.
 
When it turns a rich, creamy yellow, that’s a strong sign the watermelon is done growing and ready to pick.
 
The darker and creamier that spot, the more confident you can be.
 

3. The Skin Loses Its Shine

A growing watermelon has a glossy, shiny rind.
 
As it finishes growing, that shine dulls into a more matte finish.
 
When the surface looks dull rather than reflective, the watermelon is done growing and has moved into the ripening phase.
 

4. The Thump Sounds Hollow

Give the watermelon a good thump with your knuckles.
 
A watermelon that’s still growing sounds solid and dense.
 
Once it’s done growing, you’ll hear a deep, hollow sound instead.
 
It takes a bit of practice, but the thump test is a handy companion to the tendril and ground spot checks.
 

Why Timing Matters When a Watermelon Is Done Growing

Picking at the right moment matters more than most people realize.
 
If you pick too early, before the watermelon is done growing, the flesh will be pale, bland, and less sweet.
 
Watermelons don’t continue ripening much after they’re harvested, so you can’t count on counter time to save an underripe melon.
 
On the other hand, leaving a watermelon on the vine too long after it’s done growing leads to mealy, mushy flesh and a rind that starts to crack.
 
That’s why learning when a watermelon is done growing is worth the effort.
 

1. Sugar Content Peaks at the Right Time

A watermelon that’s done growing has had enough time to convert starches into sugars.
 
Pick it too soon, and those sugars never fully develop.
 
Wait too long, and the texture breaks down even though the flavor may still hold.
 

2. Texture Depends on the Harvest Window

The ideal window for picking is short.
 
Once a watermelon is done growing, you generally have about a week to ten days before quality starts to decline.
 
So checking the tendril, ground spot, and rind every few days keeps you from missing that window.
 

Common Mistakes When Checking If a Watermelon Is Done Growing

Even experienced gardeners slip up when trying to figure out when a watermelon is done growing.
 
Here are a few mistakes to avoid.
 

1. Relying Only on Size

Big doesn’t always mean done.
 
Some watermelons stop growing at a smaller size depending on the variety and growing conditions.
 
Size alone won’t tell you when a watermelon is done growing, so pair it with the tendril and ground spot checks.
 

2. Ignoring the Variety

Different watermelon varieties mature at different rates.
 
A small icebox watermelon might be done growing in 70 days, while a large heirloom variety could take 90 days or more.
 
Check your seed packet for the days to maturity as a general guide alongside the physical signs.
 

3. Picking Based on Sound Alone

The thump test is helpful, but it’s subjective.
 
Two people can thump the same watermelon and hear different things.
 
Use it as one piece of the puzzle, not the only factor when deciding if a watermelon is done growing.
 

So, How Do You Know When a Watermelon Is Done Growing?

You know a watermelon is done growing when the tendril nearest the fruit turns brown and dries up.
 
Combine that with a creamy yellow ground spot, a dull rind, and a hollow thump, and you’ve got your answer.
 
Timing your harvest right when a watermelon is done growing gives you the sweetest, juiciest fruit your garden can produce.
 
So keep an eye on those tendrils, and you’ll never第二-guess your harvest again.