Billions of Seeds
"Hidden underground in rural Sussex is the world’s largest collection of seeds from wild plants.
The Millennium Seed Bank (MSB) is home to over 2.4 billion seeds, representing over 39,000 different species of the world’s storable seeds.
This is the most diverse wild plant species genetic resource on Earth – a global insurance policy to store and conserve seeds from common, rare or endangered useful plants."
https://www.kew.org/science/collections-and-resources/research-facilities/millennium-seed-bank