HobbyXplore

Terrariums are miniature gardens that let you bring a little bit of nature indoors. With the right container, plants, soil, and moisture, you can create a small ecosystem that’s decorative, rewarding to build, and relatively easy to care for.

This guide covers the basics of terrariums for beginners, including what you need, how terrarium layers work, which plants to choose, how to make a terrarium step by step, and how to care for it once it’s finished.

Ready to Xplore terrariums? Let’s get started!

Xploration Map

• What Do You Need for a Terrarium?
• Open vs. Closed Terrariums
• Understanding Terrarium Layers
• Choosing Plants for Your First Terrarium
• How to Make a Terrarium: Step by Step
• How to Water a Terrarium
• Terrarium Care for Beginners
• Common Terrarium Mistakes
• How Long Do Terrariums Last?
• Is a Terrarium a Good Hobby for Beginners?
• Terrarium FAQs

What Do You Need for a Terrarium?

You don’t need a long list of supplies to make your first terrarium. The exact materials depend on whether you’re creating an open or closed terrarium, but most beginner setups use the same basic components.

• Glass container – Choose a clear container that gives your plants enough room to grow. Closed terrariums need a lid, while open terrariums leave the top exposed.
• Drainage material – Small gravel, pebbles, or similar material forms the bottom layer and helps keep excess water away from plant roots.
• Terrarium soil or substrate – Use a growing medium suited to the plants you choose rather than ordinary outdoor soil.
• Plants – Select small plants that have similar light and moisture needs and will fit comfortably inside the container.
• Moss – Moss can be used decoratively and, depending on the terrarium, may also help cover exposed soil.
• Activated charcoal – Often added to closed terrariums to help reduce odors and impurities, although it isn’t required in every setup.
• Small tools – A spoon, small trowel, tweezers, or long-handled tools can make planting and arranging materials easier.
• Water – You’ll only need a small amount, especially in a closed terrarium.
• Decorations – Stones, wood, or other terrarium-safe decorations are optional but can add personality to the finished design.

For your first terrarium, keep the setup simple. A clear container, suitable plants, proper substrate, and careful watering matter more than adding lots of decorative extras.

Open vs. Closed Terrariums

One of the first choices you’ll make is whether to build an open or closed terrarium. The main difference is how much moisture and airflow stay inside the container.

• Closed terrariums – These have a lid or cover that traps moisture inside. Water evaporates, collects as condensation, and returns to the soil, creating a humid environment. They work best with plants that enjoy consistent moisture and humidity, such as many ferns, mosses, and small tropical plants.
• Open terrariums – These have an uncovered opening that allows more airflow and moisture to escape. They usually need more frequent watering and are better suited to plants that prefer lower humidity.

Closed terrariums can require less frequent watering once they become established, but too much moisture can lead to mold, rot, or excessive condensation. Open terrariums dry out more quickly, so you’ll need to monitor the soil more often.

For beginners, either type can work well. The most important thing is choosing plants that are suited to the environment you create rather than mixing plants with very different moisture and humidity needs.

Understanding Terrarium Layers

Terrarium layers help create the right balance of drainage, moisture, and support for your plants. The exact setup can vary, but most beginner terrariums use a few basic layers.

• Drainage layer – Small pebbles, gravel, or another coarse material goes at the bottom of the container. Because terrariums usually don’t have drainage holes, this layer gives excess water somewhere to collect away from the plant roots.
• Activated charcoal – A thin layer of activated charcoal is sometimes added above the drainage layer, especially in closed terrariums. It can help reduce odors and impurities, but it isn’t required for every setup.
• Barrier layer – A piece of mesh, landscape fabric, or a thin layer of sphagnum moss can help keep soil from settling down into the drainage material.
• Soil or substrate layer – This is the main growing layer for your plants. Use a mix suited to the plants you’re growing rather than ordinary garden soil.
• Moss or decorative layer – Moss, stones, bark, or other terrarium-safe materials can be added on top for appearance and to help finish the design.

The layers don’t need to be extremely deep, but the soil should be deep enough for your plants’ roots. The size of your container and the plants you choose will determine how much of each material you need.

A good terrarium setup is less about following one exact formula and more about giving excess water somewhere to collect while providing the plants with the soil and moisture conditions they need.

Choosing Plants for Your First Terrarium

The plants you choose will largely determine how easy your terrarium is to care for. For beginners, the best approach is to choose small plants with similar light, moisture, and humidity needs.

A few beginner-friendly options include:

• Fittonia (nerve plant) – A compact tropical plant that enjoys humidity and works especially well in closed terrariums.
• Small ferns – Many miniature ferns prefer moist, humid conditions and can do well in closed terrariums.
• Peperomia – Some small varieties stay compact and adapt well to terrarium conditions.
• Pilea – Certain small pilea varieties can work well where there is bright, indirect light and consistent moisture.
• Mosses – Moss can add texture and ground cover, especially in humid closed terrariums.
• Succulents – Better suited to open terrariums because they prefer lower humidity and drier conditions.

When choosing plants, avoid mixing species with very different needs. A moisture-loving fern and a drought-tolerant succulent, for example, are unlikely to thrive in the same terrarium.

Also consider the mature size of each plant. A plant that looks tiny at the garden center may quickly outgrow a small container, so look for varieties that naturally stay compact or tolerate occasional trimming.

For your first terrarium, choose just a few compatible plants rather than trying to fit as many as possible into the container.

How to Make a Terrarium: Step by Step

Once you have your container, plants, and materials ready, putting a terrarium together is fairly straightforward. The exact setup will depend on whether you’re making an open or closed terrarium and which plants you’ve chosen.

1. Clean the container – Wash and dry the glass so you’re starting with a clean environment.
2. Add the drainage layer – Place a layer of small pebbles or gravel at the bottom to give excess water somewhere to collect.
3. Add charcoal and a barrier layer if using them – Add a thin layer of activated charcoal if it’s part of your setup, followed by mesh, sphagnum moss, or another barrier to help keep soil out of the drainage layer.
4. Add the soil or substrate – Add enough growing medium for the plants’ roots and gently shape the surface where you want the plants to sit.
5. Arrange the plants – Before planting, position the plants inside the container to see how they look together. Leave enough room for them to grow.
6. Plant the terrarium – Make small holes in the soil, place each plant at approximately the same depth it was growing previously, and gently firm the soil around the roots.
7. Add moss or decorations – Finish the surface with moss, stones, wood, or other terrarium-safe decorations if desired.
8. Water lightly – Add a small amount of water rather than soaking the soil. It’s easier to add more later than to remove excess moisture.
9. Clean the glass – Brush away loose soil and wipe the inside of the container if needed.
10. Choose the right location – Place the finished terrarium where it will receive suitable light for the plants, generally away from harsh direct sunlight.

After setting up your terrarium, watch it closely for the first few weeks. Condensation, soil moisture, and plant growth can help you determine whether you need to adjust the amount of water, airflow, or light.

How to Water a Terrarium

Terrariums usually need much less water than ordinary houseplants. How often you water depends on whether the terrarium is open or closed, the plants you’re growing, and how quickly the soil dries.

• Closed terrariums – Because moisture is trapped inside, they may go weeks or even longer without additional water. Light condensation is normal, but constantly fogged glass or soggy soil can be a sign of too much moisture.
• Open terrariums – These lose moisture more quickly and need to be checked more often. Water when the soil begins to dry, keeping the needs of your specific plants in mind.

When watering, add a small amount at a time and direct it toward the soil rather than soaking the entire container. A spray bottle, small watering bottle, or narrow-spout container can make this easier.

Avoid following a strict watering schedule. Instead, watch the soil, condensation, and plants for clues. Wilting or very dry soil may mean the terrarium needs more water, while standing water, yellowing leaves, mold, or persistently wet soil can indicate too much.

When in doubt, start with less water. It’s much easier to add moisture than to remove excess water from a container without drainage holes.

Terrarium Care for Beginners

Once your terrarium is established, regular care is mostly about watching how the plants respond and making small adjustments when needed. Light, moisture, airflow, and plant growth all affect how well the terrarium does over time.

• Light – Most terrarium plants do best in bright, indirect light. Avoid strong direct sunlight, which can quickly heat the glass and damage the plants.
• Moisture – Check the soil and condensation rather than watering on a fixed schedule. Closed terrariums usually retain moisture much longer than open ones.
• Condensation – A small amount of condensation in a closed terrarium is normal. If the glass stays heavily fogged or water constantly runs down the sides, the terrarium may be too wet.
• Airflow – If a closed terrarium has excessive condensation or signs of mold, temporarily opening the lid can allow some moisture to escape.
• Trimming – Prune plants when they begin crowding the container or growing against the glass.
• Remove damaged growth – Take out dead or decaying leaves promptly so they don’t encourage mold or rot.
• Keep the glass clean – Wipe away soil, mineral deposits, or algae when necessary so light can reach the plants and the terrarium stays easy to see.

Terrarium light requirements vary depending on the plants you choose, so always consider their individual needs. A healthy terrarium should have enough moisture to support the plants without remaining waterlogged, along with enough light to encourage steady growth.

Common Terrarium Mistakes

Terrariums are fairly forgiving, but a few common mistakes can make it harder for the plants to thrive. Most problems come down to too much moisture, poor plant choices, or unsuitable light.

• Overwatering – Terrariums need much less water than ordinary potted plants. Excess moisture can lead to root rot, mold, and constantly soggy soil.
• Too much direct sunlight – Glass containers can heat up quickly in direct sun, which may scorch or overheat the plants.
• Mixing plants with different needs – Combining humidity-loving plants with drought-tolerant plants makes it difficult to create conditions that suit everything in the container.
• Skipping the drainage layer – Without drainage holes, excess water has nowhere to escape. A drainage layer gives extra moisture somewhere to collect below the soil.
• Overcrowding the container – Plants need room to grow and airflow around their leaves. Packing too many plants together can create problems as they mature.
• Using the wrong soil or substrate – Different plants need different growing conditions, so ordinary garden soil isn’t always appropriate for a terrarium.
• Ignoring mold or decaying leaves – Remove damaged plant material early and adjust moisture or airflow if mold begins to develop.
• Using plants that will quickly outgrow the container – Choosing naturally compact plants can reduce the amount of trimming and maintenance needed later.

If something starts going wrong, don’t assume you need to rebuild the entire terrarium. Small adjustments to watering, light, airflow, or plant placement can often correct the problem.

How Long Do Terrariums Last?

There isn’t one set lifespan for a terrarium. How long it lasts depends on the plants, container, moisture balance, light, and how well the terrarium is maintained.

A healthy terrarium can last for months or even years, and some closed terrariums can remain established for a very long time with relatively little intervention.

A few things that affect lifespan include:

• Plant choice – Compact, slow-growing plants are easier to maintain long term.
• Moisture balance – Too much water can lead to rot or mold, while too little can cause plants to dry out.
• Light – Too much direct sun can overheat the container, while too little light can weaken plant growth.
• Overcrowding – Plants that outgrow the space may need trimming or removal.
• Maintenance – Removing dead leaves, controlling mold, and making small adjustments can help keep the terrarium healthy.

Terrariums naturally change over time as plants grow and compete for space. Needing to trim, replace a plant, or adjust the setup doesn’t necessarily mean the terrarium has failed—it’s part of maintaining a small living ecosystem.

Is a Terrarium a Good Hobby for Beginners?

Terrarium making is a good beginner hobby because the basic process is easy to learn, the supplies are manageable, and you can start with a relatively small project.

It can be a particularly good fit if you enjoy:

• Hands-on projects – Building a terrarium involves arranging layers, planting, decorating, and making small adjustments over time.
• Plants and nature – Terrariums let you create a miniature indoor garden even if you don’t have much outdoor space.
• Creative design – You can experiment with containers, plants, moss, stones, wood, and other decorative elements.
• Low-maintenance projects – Once established, many terrariums need less frequent attention than ordinary houseplants.
• Learning as you go – Watching condensation, plant growth, moisture, and light teaches you how a small ecosystem responds to its environment.

The main learning curve comes from balancing moisture, light, and compatible plants. Starting with a simple setup makes it easier to understand what works before trying more elaborate terrarium designs.

If you enjoy plants, creative projects, and watching something grow over time, terrarium making can be an approachable hobby to Xplore without needing a large workspace or a long list of supplies.

Terrarium FAQs

What not to put in a terrarium?

Avoid plants with very different moisture or humidity needs, plants that will quickly outgrow the container, and materials that may rot, mold, or introduce pests. For example, drought-tolerant succulents generally shouldn’t be mixed with moisture-loving tropical plants in a closed terrarium.

What do I need for a terrarium for beginners?

A basic beginner terrarium needs a clear container, drainage material, suitable soil or substrate, and compatible plants. Depending on the setup, you may also use activated charcoal, a barrier layer, moss, small tools, and decorative materials.

How long do terrariums typically last?

A healthy terrarium can last months or even years. Its lifespan depends on the plants, moisture balance, lighting, available space, and how well it’s maintained over time.

Before You Hop Away

That was quite an Xploration! Now you know the basics of terrarium types, layers, plants, watering, and what it takes to create and care for your first terrarium!

What would you like to Xplore next? Want a deeper guide to terrarium plants, soil, moss terrariums, closed terrariums, or something completely different?

Let me know in the comments what hobby or topic you’d like to see next!

Until next time, keep growing! 🌿

Hoppy Xploring!