A completed flask terrarium against a lilac background with decorative moss scattered around.
Make a Flask Terrarium
Make a Flask Terrarium
Make a Flask Terrarium
  • Load image into Gallery viewer, A completed flask terrarium against a lilac background with decorative moss scattered around.
  • Load image into Gallery viewer, Make a Flask Terrarium
  • Load image into Gallery viewer, Make a Flask Terrarium
  • Load image into Gallery viewer, Make a Flask Terrarium

Make a Flask Terrarium

London Terrariums
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  • Botany
  • Level: Medium
  • Make in 2-4 Hours
  • Price: Under £20
  • Type: Online Course Only

Learn how to make a terrarium using this unique shape and add a bit of chemistry to your interiors.

The Flask Terrarium is a unique shape that London Terrariums will teach you to master. The familiar shape and charming green contents evoke a chemistry lab meets rainforest. With a small, elongated spout, the results are well worth the steady hand and careful execution needed to complete this project. Both its iconic silhouette and ‘ship in a bottle’ novelty make the Flask Terrarium a beautiful living ornament in any home.

In step-by-step instructions and photographs, Emma Sibley from London Terrariums will take you through the steps to create your terrarium, with plants, pebbles and moss. You'll also get to grips with the terrariums history and their recent resurgence, understand how they create their own water-cycle and self-contained ecosystem, and you'll learn exactly how to care for them. You’ll even learn how to make your own tools from household items in order to best create your demijohn terrarium.

By the end of the course, you will have your own miniature garden to watch grow and develop over time in your home.

With UNLIMITED ACCESS 24/7, you’ll be able to drop in and out of the course at your own pace, and refer back to it anytime. By the end of this course, you will be able to:

  • Expertly clean and prepare your jar
  • Combine pebble, moss and plants in the optimum quantities
  • Select and use specialist terrarium-making equipment and materials
  • Understand how terrariums create their own water-cycle and self contained ecosystem
  • Care for your finished terrarium
  • Make professional standard terrariums from household jars

Expert Emma will share with you her foolproof step-by-step method, so you can make your own professional terrariums at home.

She will also share with you top care tips and common mistakes to avoid, so you can keep your terrarium healthy and happy. With this course + kit, you'll learn a life-long skill and enjoy making your own custom terrarium from scratch, for the same price as buying a ready-made one.

You can try out a free taster course with Emma and learn how to take care of your terrarium.

How is this terrarium course taught?

This course is taught through step-by-step instructions and photography as provided by terrariums expert Emma Sibley of London Terrariums, available to access online via My Courses

What else do I need?

You can source the required materials from most garden centres. Contact us for advice if you’re unsure of where to find these items or post in our support Facebook Group.


  • Flask vessel, cork and cork base (about 2 litres)
  • Selection of moisture loving houseplants (e.g. Begonias, Baby’s tears, button fern, Fittonia, Ivy, Miniature Palm, Calathea, miniature Boston Fern)
  • Compost Tub and Basket (Compost or houseplant compost, about 1.5 Litres)
  • Carpet moss (as much as you wish for the surface of your terrarium)
  • Small stones (ideally washed) Garden Gravel
  • Activated charcoal (2 heaped teaspoons, found in health food stores)
  • Funnel (can be made from half a broken plant pot)
  • Teaspoon
  • Garden stick
  • Water spray bottle
  • Water
  • Radiator brush and sponge brushes
  • Cork at the end of a stick (for patting down the soil)
  • Long tweezers
  • Kitchen roll
  • Scissors (regular household scissors)

How do I gift this course?

Select "Yes" under "Is this a gift?". Once purchased, you will receive a PDF with instructions on how to enrol which you can either email directly to the recipient or print out, to be given in person.


Emma says, "Fundamentally, it's not only about creating aesthetically beautifully objects. For us it is the deeper fascination with how plants behave and the exciting part terrariums play in the history of horticulture."

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Emma Sibley of London Terrariums standing in her shop front in New Cross.

London Terrariums

London Terrariums is run by Emma Sibley. From making terrariums for friends and family to the shop opening in 2017, London Terrariums is where you can buy ready-made terrariums, kits or attend a workshop. Emma is a member of the British Cactus and Succulent Society.