How much do you really know about natural cork?

Most people know cork as the closure that seals a bottle of wine. But that's only the beginning of the story.

Every quarter, the Natural Cork Council invites you to test your knowledge with a new Cork IQ Challenge exploring the remarkable world of cork—from harvest season and biodiversity to sustainability, architecture, design, and even space exploration.

This Fall Edition celebrates one of nature's most extraordinary harvests. Unlike timber, cork is harvested without cutting down the tree, allowing cork oak forests to thrive for generations while supporting wildlife, rural communities, and one of the world's most sustainable materials.

Answer the questions below, and you'll automatically be entered to win one of three beautiful cork gifts that showcase just how versatile this remarkable material can be.

Grand Prize
A premium cork lifestyle accessory

Second Prize
A handcrafted cork home or office accessory

Third Prize
A unique cork gift celebrating sustainable design

Winners will be selected at random from all eligible entries. One entry per person.

Ready? Let's see how well you know cork.

2

Cork harvesting is unlike any other agricultural harvest because:* This field is required.

The bark is carefully removed without harming the tree.

The tree is replanted after every harvest.

The cork is harvested from fallen branches.

The tree is harvested only once during its lifetime.

3

Unlike timber, harvesting cork never requires cutting down the tree—the bark naturally regenerates, allowing the same tree to be harvested for generations.

4

Q1_Result

5

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6

After a cork oak is harvested, approximately how long does it take before the bark can be harvested again?* This field is required.

3 years

5 years

9 years

15 years

7

A cork oak needs about nine years to regenerate its bark between harvests, making each harvest a carefully timed process that protects the health of the tree.

8

Q2_Result

9

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10

A healthy cork oak can continue producing harvestable cork for approximately:* This field is required.

30 years

75 years

More than 150 years

Only until its fifth harvest

11

A single cork oak can produce natural cork for well over 150 years, with some trees living more than 200 years and supplying dozens of harvests.

12

Q3_Result

13

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14

Why do cork oak forests play such an important role in the environment?* This field is required.

They provide habitat for hundreds of plant and animal species.

They help capture and store carbon.

They protect fragile Mediterranean landscapes.

All of the above.

15

Cork oak forests are biodiversity hotspots that support hundreds of species while helping combat climate change by storing carbon and protecting vulnerable ecosystems.

16

Q4_Result

17

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18

Which surprising industry uses natural cork because of its thermal protection properties?* This field is required.

Aerospace

Architecture

Fashion

All of the above

19

Natural cork has been used in aerospace applications because its unique cellular structure provides outstanding thermal insulation while remaining lightweight.

20

Q5_Result

21

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22

Natural cork is an excellent insulator because it is approximately:* This field is required.

25% water

50% cellulose

90% air

100% wood fiber

23

A single wine cork contains around 40 million microscopic air-filled cells, giving cork its remarkable ability to cushion, insulate, float, and create a reliable seal.

24

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25

Q6_Result

26

Name* This field is required.

First Name

Last Name

27

Email* This field is required.

example@example.com

28

State/Province

29

I'd like to receive occasional updates from the Natural Cork Council about cork, sustainability, and future Cork IQ Challenges.

YESNO