So, where did they go? And, do people still grow plants in indoor terrariums?

Interestingly the glass terrarium seems to be gaining a resurgence and it's possibly not tied to the garden accessory trends that fueled its impact in the 'decade of greed'. The renewed popularity is almost completely a result of diminishing home gardens. As houses become smaller and more people opt for inner-city dwellings there desire for indoor greenery has escalated.

And we're not just talking Rent-a-plants! No, gardeners can exist inside - if forced to - and the humble terrarium is probably the best vent for a hobby that is reluctantly constrained indoors.

What are the benefits for terrarium plants?

The obvious benefit, especially in a glass terrarium, is the micro climate that is created for the plants. Much like a greenhouse it produces the perfect growing habitat for plants and protects them from the harsh extreme of outdoor climates. The environment is almost always perfectly balanced and plants have one less barrier to growing successfully.

Another benefit is their size. The restrictions that you place upon the plants in terms of terrarium dimensions enables you to garden at your leisure rather than being dictated to by a garden bed intent on world domination. And they're usually weed-free.

And if you're writing them off because you think plant choice is going to be a problem then check out this link to get some perspective. There are literally hundreds of plants that will grow wonderfully in an indoor terrarium.

How do you start a terrarium?

The first step is to secure a glass terrarium whether it be one of those trapezoidal monstrosities masterpieces that took the world by storm in the 80's, a goldfish bowl or even a glass reptile container. It shouldn't need a lid but if you're starting your plants off from seed it may be beneficial.

Once you have your growing equipment the next most important part is the growing medium. Filling the bottom with potting mix isn't going to cut it, unfortunately, so we have to take some steps to make sure the soil is going to assist our plants rather than hinder them.

The bottom layer should be at least 1/2 inch deep of aggregate - gravel, fine builder's rubble or small stones should suffice. This will help in drainage and keep the soil from getting too wet. Then, a layer of spagnum peat moss - or better still, some coconut fibre - to hold the soil from filling the aggregate and finally topped with a specially made terrarium mix. In reality, this mix is usually just potting soil with river sand added to it at the ratio of 1 part sand to 2 parts potting mix.

Then it's the fun part, adding your selection of plants. Be mindful of the size of each plant's growing dimensions and space them accordingly. Then a light mist of water and Voila! your glass terrarium is ready for display.

They will need to be sited in a location that receives at least 4-6 hours sunlight during the day so a sill or place near the window is perfect.