Soil Drainage.
Depending on the plants you use, you will need a well draining soil that has
some coarse sand or something to make sure that water isn’t sitting at your
plant roots. Since terrariums are generally in glass containers without holes
in the bottom, you will need some rocks at the bottom to give that water
somewhere to go or you will have gross moldy soil and it will kill your plants.
Plant Type. The
possibilities are endless, but with a terrarium, make sure your plants want to
be friends. For example, if you put a fern requiring a lot of water and a
cactus that requires very little, somebody wont be happy and might even die.
The same goes with sunlight. Find plants with equal sun, water, and soil
requirements so you will have happy plants.
Container
Cleanliness. Since moisture is an issue with terrariums, you want to make
sure that the container you are using has had a good scrub. Use a little bleach
in your water to clean it and let it dry completely just to keep mold from
growing in there.
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