Choosing a bottle for your terrarium. In general the bigger the bottle the better! You can get larger plants and flowers in there and you can have a more detailed arrangement. Something as large as a five gallon water bottle would be great! One important consideration is the size of the opening at the top. This makes a big difference in the difficulty of the terrarium. The picture here shows two bottles. One is a pickle jar and the other is a wine bottle The wine bottle has a very attractive shape and the pickle bottle will be easy to work with because of the large opening. You can use either type of top opening just be aware that the smaller the opening the more work it will be. Remember that in order for your terrarium to be a closed environment it must have a cap or stopper. The wine bottle here has a cork in it.
About the Plants for this terrarium - You have to of course choose small plants, and the plants in the picture look rather large but this close-up shows that I have chosen plants that can be taken apart at the root. I will separate the different stalks and only place some in the bottle. I have also chosen plants with thin leaves and a nice Croton with red stripes on its leaves. This will add a nice splash of color to the terrarium.
About the theme of your terrarium - A theme is always a nice touch that makes your terrarium much more interesting. For this project I have created a "Sword in the Stone" theme. I have chosen a nice granite rock and I whittled a small sword out of wood. I will glue the sword into the stone and then place it in the terrarium. It will create a scene as if it is just waiting for King Arthur to find it.
About the Arrangement of your Bottle Terrarium - You might want to draw some sketches of how it will look so you can tinker with the arrangement without having the plants already in the bottle. This is particularly important if you are using a small opening terrarium like a wine bottle.
Suggestion: Get a pot about the same diameter as your bottle and arrange all your plants and elements right in it. When you find an arrangement you like you can then transfer the items one at a time into the bottle thus re-creating the scene as you designed it. .
If you are going to be placing plants into your terrarium here is a tip. The picture shown here is of the hanger tool placing the plant into the bottle. The hanger has a loop at the bottom to support the soil and roots. Make a hole in your soil inside the bottle then lower the plant right into it. Notice how the thin leaves of the plant will fold nicely right into the mouth of the bottle. This technique takes a little practice and you will find yourself using two hanger tools at the same time. Once you have the plant in place use the tool to gently shovel soil around it then tamp it down firmly. Make sure the hole you make for the plant is nice and deep. You don't want the plant falling over.
Here is the plant as it is going in.
For my bottle terrariums I use both plants and seeds. This way it is immediately ready to show off yet over time it will grow and change.
Caring for Your Terrarium - A bottle Terrarium is a closed environment and it can be sensitive to water and to light so once it is first made you will need to monitor it closely for the first few days. If it gets too much sunlight it can get too hot inside and bake your plants. Pay particular attention to the moisture inside. It should form a nice layer of dew along the top of the bottle. This will slowly rain down back on the plants. If it is too wet inside leave the top open for a day to dry some of it out. If the moisture is right you won't need to water it but maybe once a month (depending on how many plants there are and how much water they need).
A note about fertilizing your bottle terrarium - You shouldn't add any liquid or solid fertilizers to your terrarium. What you want is very slow or no growth from your plants. They are almost in a state of suspended animation. If they are fertilized they could very quickly grow too large and fill up your bottle.
Here is a unique Bottle Terrarium by a guest artist (Thyrza) You can see more of her work and how she uses Polymer Clay in her terrariums here: Thyrza's Terrariums