Growing Underground

One of the fantastic growers we work with is Growing Underground, a microgreens and salad leaves grower based in Clapham.

Salads grown in Clapham?
All year long? How is it possible?

Growing Underground is exactly what it says in the tin! Their mouth-watering microgreens and crisp salads are grown in a zero-carbon farm, 33 meters below the street level in forgotten tunnels under busy Clapham streets. Using the latest hydroponic systems and LED technology, Growing Underground are able to grow their crops all year-round in a pesticide-free environment. This means you can enjoy the most delicious salad selection throughout the year.

Why Growing Underground?

There are many reasons why we are proud to work with such an innovative and incredible supplier. As well as optimising and enhancing the entire agricultural process, they also use sustainable growing techniques. Not to mention that the hydroponics system uses 70% less water than traditional open-field farming.

It’s important for us to support local businesses, and you can’t get any more local than Clapham! Since we are limiting food miles, Growing Underground products can be in your kitchen within 4 hours of being picked and packed.  

We love working with Growing Underground because they are successfully beginning an agricultural revolution!


Knock Knock sell a variety of delicious microgreens from Growing Underground, including:

  • Perfect Veg Box - Treat yourself to a colourful selection of the freshest and highest quality ingredients. Enjoy the glorious mix of vegetables that will inspire you to cook like a pro!


  • Fruit & Veg Box - The best way to get your 5 a day! Treat yourself to all your favourite tasty fruit and veg. Enjoy the high-quality taste of nutritious and delicious produce every day of the week.


  • Essentials Box - All the fresh vegetables you need to create healthy midweek meals. This box is full of all your cooking staples, from organic sourdough bread to free-range eggs, alongside seasonal fruit and veg!

 Check Out More Of Our Delicious Products