FOR THE LAST 40 YEARS, THIS BOTTLE GARDEN HAS BEEN COMPLETELY SEALED FROM THE OUTSIDE WORLD

To look at this flourishing mass of plant life you’d think David Latimer was a green-fingered genius.
Truth be told, however, his bottle garden – now almost in its 53rd year – hasn’t taken up much of his time.

In fact, on the last occasion he watered it Ted Heath was Prime Minister and Richard Nixon was in the White House.

For the last 40 years it has been completely sealed from the outside world. But the indoor variety of spiderworts (or Tradescantia, to give the plant species its scientific Latin name) within has thrived, filling its globular bottle home with healthy foliage.

Mr Latimer, 80, said: ‘It’s 6ft from a window so gets a bit of sunlight. It grows towards the light so it gets turned round every so often so it grows evenly. ‘Otherwise, it’s the definition of low-maintenance. I’ve never pruned it, it just seems to have grown to the limits of the bottle.’

The bottle garden has created its own miniature ecosystem. Despite being cut off from the outside world, because it is still absorbing light it can photosynthesise, the process by which plants convert sunlight into the energy they need to grow.

Lush: Just like any other plant, Mr Latimers's bottled specimen has survived and thrived using the cycle of photosynthesis despite being cut off from the outside world

HOW THE BOTTLE GARDEN GROWS

Bottle gardens work because their sealed space creates an entirely self-sufficient ecosystem in which plants can survive by using photosynthesis to recycle nutrients.

The only external input needed to keep the plant going is light, since this provides it with the energy it needs to create its own food and continue to grow.

Light shining on the leaves of the plant is absorbed by proteins containing chlorophylls (a green pigment).

Some of that light energy is stored in the form of adenosine triphosphate (ATP), a molecule that stores energy. The rest is used to remove electrons from the water being absorbed from the soil through the plant's roots.

These electrons then become 'free' - and are used in chemical reactions that convert carbon dioxide into carbohydrates, releasing oxygen.

This photosynthesis process is the opposite of the cellular respiration that occurs in other organisms, including humans, where carbohydrates containing energy react with oxygen to produce carbon dioxide, water, and release chemical energy.
But the eco-system also uses cellular respiration to break down decaying material shed by the plant. In this part of the process, bacteria inside the soil of the bottle garden absorbs the plant's waste oxygen and releasing carbon dioxide which the growing plant can reuse.

And, of course, at night, when there is no sunlight to drive photosynthesis, the plant will also use cellular respiration to keep itself alive by breaking down the stored nutrients.

Because the bottle garden is a closed environment, that means its water cycle is also a self-contained process.

The water in the bottle gets taken up by plants’ roots, is released into the air during transpiration, condenses down into the potting mixture, where the cycle begins again.

A SELF-CONTAINED WORLD: HOW TO MAKE YOUR OWN BOTTLE GARDEN

The idea of a bottle garden is to create a world in microcosm. It will have its own special habitat and should require little maintenance, writes NIGEL COLBORN.

First choose a glass container. It will need a wide neck for easy access and to look attractive. A goldfish bowl is ideal, or for children, a big jam jar might do.

You'll also need some good-quality potting compost, shingle or coarse grit and, of course, the plants.

Use a large spoon to insert a layer of grit into the jar and cover that with compost deep enough to accommodate the plant roots.
Finally, introduce the plants. You'll need very few and they must be tiny specimens - unless it's an enormous receptacle. Little ferns such as indoor maidenhair or Adiantum, small varieties of Tradescantia and baby plants of Chlorophytum will all establish easily. Miniature trailers such as 'Mind-your-own-business' (Soleirolia) will also flourish.

Move each plant gently into position, adjusting them with a stick or with kitchen tongs until you've got them where you want them. Adding a final layer of grit after planting will hold the compost down and make your micro-garden look prettier.

Water with extreme care (your jar won't need much) and place the finished mini garden in a well-lit spot, but not on a hot south-facing windowsill.