Check the key differences between both terrarium styles and find out which one is truly the right fit for your home!
Both styles, an open vs closed terrarium, have captivated plant lovers around the world, turning ordinary glass containers into living works of art. However, choosing the right type can make all the difference in how well your miniature garden thrives.
The world of terrariums is surprisingly rich. From lush tropical jungles sealed inside apothecary jars to airy desert landscapes in open bowls, these tiny ecosystems offer something truly special for every kind of plant enthusiast.
Before diving into the details, it helps to understand what each type actually means. In essence, the difference comes down to airflow, humidity, and the kinds of plants that can live comfortably inside each environment.
In this article, we will walk you through everything you need to know. For example, how each type works to which plants thrive in each setting, and ultimately, which one is the best fit for your lifestyle and home decor goals.
What is an open terrarium?
When comparing open vs closed terrarium options, the open style is exactly what it sounds like: a container with no lid, or at least a significant gap that allows free air circulation. This setup creates a drier microenvironment, which is perfect for plants that dislike excess moisture.
Consequently, open terrariums are the go-to choice for succulents, cacti, and air plants. These species naturally come from arid climates and can quickly rot if kept in a consistently humid space. The open design gives them room to breathe — literally.
From a design perspective, open terrariums are also incredibly versatile. They can be built inside geometric glass frames, wide-mouth fish tanks, vintage bowls, or even repurposed wine glasses. The exposed top makes it easy to rearrange plants and decorations whenever you like.
Maintenance for open terrariums is generally straightforward. Because moisture evaporates quickly, you will need to water more frequently than you would with a closed setup. Nevertheless, overwatering is still a risk, so always check the soil before adding more water.
What is a closed terrarium?
On the other side of the open vs closed terrarium debate sits the sealed glass garden. A closed terrarium features a lid or stopper that traps moisture inside, creating a self-sustaining, humid microclimate. This environment closely mimics a tropical rainforest, warm, moist, and lush.
Ferns, mosses, orchids, and other moisture-loving plants absolutely flourish in this kind of setting! The water cycle repeats itself within the container: water evaporates, condenses on the glass walls, and drips back down into the soil, feeding the plants again and again.
Because of this natural water recycling, closed terrariums require very little watering once they are properly established. In fact, some well-balanced closed terrariums can go weeks or even months without any intervention from their owners.
That said, there is a learning curve involved. Getting the balance right between too much and too little moisture takes some practice. If condensation becomes so heavy that you cannot see your plants clearly, opening the lid briefly to let some air in usually solves the problem.
Key differences at a glance
To make your decision a little easier when choosing an open vs closed terrarium, here is a quick comparison of the most important characteristics of each type:
| Feature | Open terrarium | Closed terrarium |
|---|---|---|
| Humidity | Low | High |
| Best plants | Succulents, cacti, air plants | Ferns, mosses, orchids |
| Watering frequency | Regular | Rare |
| Self-sustaining | No | Yes (when balanced) |
| Light needs | Bright indirect or direct | Indirect or low light |
| Maintenance level | Moderate | Low (once established) |
| Beginner-friendly | Very much so | Yes, with some learning curve |
Choosing the right plants for each type
One of the most critical factors in the open vs closed terrarium decision is, without question, the plants you want to grow. That means, selecting the wrong species for the wrong environment is the most common mistake beginners make, and it can lead to disappointment quickly.
For open terrariums, think dry and tough. Succulents such as echeveria, aloe, and haworthia are excellent choices. Add a few smooth river pebbles and some sand, and you have a desert-inspired arrangement that practically takes care of itself.
For closed terrariums, think lush and tropical. Nerve plants (fittonia), mini ferns, baby’s tears, and cushion moss all thrive in sealed containers. These plants love the constant humidity and tend to grow slowly, keeping your terrarium looking tidy for longer.
Furthermore, it’s worth considering the eventual size of your plants. Even in a closed container, plants do grow. So, research how large each species gets to avoid overcrowding your terrarium in just a few months. You might want to check out our post on the best plants for a terrarium, to learn about sizes, growth habits, and everything you need to pick the perfect species for your setup.
Design and aesthetics: expressing your style
Beyond plant care, the open vs closed terrarium choice also has significant aesthetic implications. Both types are beautiful, but they create very different moods and suit different interior design styles.
Open terrariums and minimalist spaces
Open terrariums tend to have a clean, sculptural look that pairs beautifully with minimalist, Scandinavian, or modern industrial interiors. Their airy structure lets the plants take full visual center stage.
Geometric open terrariums, in particular, have become popular home accessories in recent years. They look striking on shelves, coffee tables, and window ledges, adding a touch of nature without overwhelming the space.
Closed terrariums and lush, moody interiors
Closed terrariums, on the other hand, evoke a sense of mystery and lushness. Their sealed glass walls, often covered in gentle condensation, create a dreamy, almost otherworldly atmosphere that feels deeply immersive.
This makes closed terrariums particularly well-suited to bohemian, eclectic, or maximalist spaces. In these settings, the open vs closed terrarium question almost answers itself: the richer, more theatrical look of a sealed jar fits right in.
Mixing both styles in the same space
There is absolutely no rule that says you must choose just one style. Many terrarium enthusiasts keep several containers of both types throughout their homes, playing with contrasts in texture, color, and form.
Grouping open and closed terrariums together on a single shelf creates an interesting visual dialogue between arid and tropical worlds. Moreover, it lets you grow a much wider variety of plant species simultaneously.
Light requirements and placement tips
Light is another factor where open vs closed terrariums behave quite differently. Getting placement right is essential for keeping your plants healthy and your glass garden looking its best.
In the open vs closed terrarium context, open types can generally handle brighter conditions. Many succulents and cacti appreciate several hours of direct sunlight each day, making a sunny windowsill an ideal location for them.
Closed terrariums, however, should be kept out of direct sunlight. The glass acts like a magnifying lens, amplifying heat and risking scorching your plants. Instead, choose a bright spot with filtered or indirect light for best results.
Artificial grow lights are also a wonderful option, especially for closed terrariums placed in darker rooms or apartments with limited natural light. LED grow lights are energy-efficient and can dramatically improve plant growth in low-light environments.
Learn common mistakes and see how to avoid them
Even the most experienced plant parents run into trouble with terrariums so don’t worry if things don’t go perfectly at first. That said, knowing the most common mistakes ahead of time can save you a lot of frustration. Here are the biggest ones to watch out for when setting up your open vs closed terrarium.
- Wrong soil mix. This is a big one. Open terrariums need fast-draining soil, a cactus or succulent mix is your best bet. Regular potting soil holds on to too much moisture and can cause root rot pretty quickly. For closed terrariums, you want something that retains moisture but still lets air through. A blend of peat or coco coir, perlite, and horticultural charcoal does the job well. The charcoal is a bonus: it keeps things smelling fresh and filters out any nasty buildup.
- Skipping the drainage layer. Before you add any soil, put down a layer of pebbles or gravel at the bottom of your container. This simple step stops water from pooling at the roots — and trust us, standing water is one of the quickest ways to lose your plants.
- Over-planting. We get it, you want it to look full and lush right away. But cramming in too many plants blocks airflow and makes everything harder to manage as they grow. Start with a few, see how they settle in, and add more later if you want.
Keep going: a reading recommendation for you
Now that you have a solid understanding of how each terrarium type works, it is time to take your knowledge further. Choosing the right plants is the very next step in this journey.
If you have decided that a sealed glass garden is for you, we have put together a resource that will help you get started on the right foot confidently and successfully.
We invite you to read our article “Best closed terrarium plants for beginners”. This is a practical, beginner-friendly guide covering the most forgiving and rewarding plants for sealed glass gardens.
In that article, you will find detailed plant profiles, care tips, and arrangement ideas. Go ahead and check it out! Your future closed terrarium is waiting for the perfect plants.