The glass jar lets in light, and its lid keeps the paper towel from drying out. Soon roots, shoots, and two leaflike things called cotyledons appear. Cotyledons store nutrients for the growing plant. They eventually shrivel up, and real leaves take over, absorbing the sunlight, oxygen, and water the plant needs to grow.
You can make a terrarium in less than an hour, with very few materials and doesn't have to be expensive. To save money, shop discount stores, flea markets or consignment shops, where you can find really cheap yet great looking glass containers, jars or even goldfish bowls.
If you know how to cut glass and have the appropriate tools, you can make a hole in the bottom of the glass, for drainage. The shot glass should then be placed on a saucer or similar for catching the water that runs through. Use only tiny plants, not big ones like sunflowers.
Those pretty glass plant watering globes do serve a purpose in plant care, but the advertisements can be misleading if you aren't paying attention. Water globes claim that by filling the globe and inserting it into the soil, your plant will receive a trickle of water for up to two weeks.
Glass globes are now readily available at garden nurseries, and air plants like the Tilandsia that we used in this terrarium are even carried at Home Depot during some seasons. I think at one point air plants were harder to locate, but now they're becoming quite common.
Another addition to the glass: tempered glass can't be cut. It shatters, and that's actually the point. Tempered means it's cooled down in a way that leaves stresses in the structure of the glass, and when it gets damaged, those stresses make it crack into tiny pieces without long sharp edges.
It should be deep enough for the plants to root to, about 2 1/2 inches. Remove the largest plant from its container and dust excess soil off the roots. Using the end of a spoon, make a hole in the soil big enough for the roots and nestle the plant inside, tamping the soil down firmly to hold it in place.
Open containers are ideal for cactus and succulent gardens, as well as other plants that prefer less humidity. Clear, smooth glass offers the best view of the plants. Shop for terrariums and supplies. To make positioning the plants easier, it helps to have a pair of long tweezers (used for aquarium plants) or a set of kitchen tongs.
Glass coke bottles are cool, really cool, but what do you do with the bottle after the coke is gone? You don't need any more candle holders, so make an automatic plant waterer. With this cheap and easy automatic plant watering system all you have to do is set it and forget it.
However, if you want to make a desert terrarium, I suggest using an open container with a large opening to let all of the moisture out, and instead of a rich soil, use a sandy cactus soil. Rainforest: tropical environment with tropical plants (bromeliads; ferns; moss; miniature palms; pothos; venus fly traps, etc).
The glass keeps everything trapped in and acts like a mini greenhouse so it will take longer for all the water to evaporate. I like the design of this one because it has quite a bit of open space so I don't think it will get too mushy or cloudy inside which is good.