Different Types of Terrariums

Have you ever wondered why some indoor plants flourish inside glass containers while others deteriorate within a week? The answer is understanding the different types of terrariums — and matching each type to the right plants and conditions. Get that pairing right and you build a nearly self-sustaining ecosystem. Get it wrong and you'll fight rot, drought stress, or disease for the life of the build. This guide covers every major terrarium style, how each one functions, and exactly what belongs inside. For related indoor plant and garden product guidance, browse our gardening reviews section.

Terrariums trace their origins to the Victorian era, when botanist Nathaniel Bagshaw Ward discovered that plants sealed in glass cases survived long sea voyages with minimal care. That observation gave indoor gardeners one of their most powerful tools: a contained microenvironment that moderates humidity, smooths temperature swings, and dramatically reduces watering demands. According to the Wikipedia entry on terrariums, all types share one defining feature — a glass or clear plastic enclosure — but their internal environments differ based entirely on whether the container is sealed or open.

That sealed-versus-open distinction governs every decision you make: container geometry, substrate depth, plant selection, and maintenance rhythm. If you're already managing potted houseplants and want to extend that practice into terrarium keeping, our guide on how to move pot plants from outside to inside explains the humidity transition plants go through — the same adjustment you'll manage when introducing them to a sealed glass environment. Once you understand the core divide, every terrarium type slots naturally into place.

Your Quick Guide to Every Type of Terrarium

Closed Terrariums — The Self-Sustaining Ecosystem

Closed terrariums are sealed or nearly sealed glass containers that trap moisture and establish a miniature water cycle inside the enclosure. Moisture evaporates from the substrate, condenses on the glass walls, and drips back to the root zone — so the plants water themselves between your interventions. Tropical ferns, mosses, fittonias, and nerve plants are the ideal occupants because they evolved in persistently humid environments. As our guide on indoor plants that absorb humidity explains, certain species actively regulate moisture in their surroundings, which makes them natural partners for sealed builds. The single discipline you must develop is restraint. Overwatering is the primary killer in closed terrariums, not neglect.

Open Terrariums — Airflow Over Humidity

Open terrariums sit at the opposite end of the spectrum. Without a lid, humidity escapes freely, keeping the internal environment dry and well-ventilated. Succulents, cacti, air plants, and drought-tolerant herbs thrive here because they evolved in low-moisture, high-airflow conditions. The tradeoff is a more demanding watering routine — you cannot rely on condensation recycling. What you gain is flexibility: open containers are easier to plant, easier to access for pruning, and far more forgiving about container geometry. Any bowl, wide-mouthed vase, or geometric frame with sufficient depth for drainage works effectively.

Air Plant Terrariums — No Soil Required

Air plants (Tillandsia species) occupy a category entirely their own. They attach to surfaces rather than soil and absorb water and nutrients through their leaves via specialized trichomes. Place them in a glass globe, an open geometric frame, or a shallow bowl with driftwood as the mounting surface. Mist them two to three times per week and soak them for 30 minutes every one to two weeks. Because they require no substrate, air plant terrariums are the fastest to assemble and the most versatile to style — ideal if you want a striking display without the complexity of soil management.

Succulent Terrariums — Desert Aesthetics in Glass

Succulent terrariums are open-style builds designed around drought-tolerant species: echeveria, haworthia, aloe, sedum, and similar genera. Substrate composition is critical — standard potting soil retains far too much moisture. Use a fast-draining cactus mix combined with coarse perlite or horticultural grit at a roughly 50:50 ratio. Decorating with sand, fine gravel, and small stones enhances drainage and adds visual texture. Succulents need bright indirect to direct light, so positioning near a south- or east-facing window is non-negotiable. Incorporating non-green plants such as purple echeveria or burgundy aloe adds striking color contrast without any additional care demands.

Tropical Terrariums — The Lush Miniature Jungle

Tropical terrariums are the most visually dramatic of all the different types of terrariums. They replicate a rainforest floor: deep layered greens, moisture-laden air, and multiple canopy levels recreated in miniature. Fittonia, selaginella, miniature ferns, orchids, and bromeliads are classic choices. These builds are almost always closed or semi-closed to sustain the humidity tropical species demand. Pair plants with matching light and moisture tolerances — a mismatch here leads to one species outcompeting and eliminating the others over time. If oxygen production matters alongside visual impact, our guide on indoor plants that give off the most oxygen helps you identify species that serve both purposes inside a tropical build.

Setup Tips That Separate Thriving Terrariums from Failed Ones

Pro tip: Always add a drainage layer of gravel or lava rock beneath your growing medium — even in closed terrariums. This layer gives excess moisture somewhere to settle so roots never sit in waterlogged soil.

Layering Your Substrate Correctly

Every terrarium benefits from a structured substrate approach, regardless of type. Start with one to two inches of drainage material — pea gravel, coarse sand, or lava rock. Add a thin barrier of activated charcoal above that layer; it suppresses the anaerobic bacteria responsible for the foul smell of poorly built closed builds. Then add your growing medium: a moisture-retaining peat-based mix for tropical and closed styles, or fast-draining cactus mix for open and succulent styles. This three-layer system gives you genuine control over moisture distribution across the entire container. For ongoing moisture management after the build, our guide on how to water a terrarium provides specific volume and frequency recommendations for different container sizes.

Choosing the Right Container

Container geometry affects every aspect of your terrarium experience. Wide-mouthed containers allow easy access for planting and pruning. Narrow-necked bottles create dramatic enclosed environments but restrict hand access during setup — use long tweezers and a thin-spout funnel for substrate pouring. Glass is the classic material: non-porous, non-reactive, and visually expressive of the layered substrate beneath. For air plants and succulents, open geometric metal-framed containers provide the airflow these species require without sacrificing the visual impact that makes terrariums worth building.

Side-by-Side: The Different Types of Terrariums Compared

Before committing to a style, use this framework to match your growing conditions and plant preferences to the right terrarium type:

Real Terrarium Builds That Prove the Concept

The Woodland Moss and Fern Display

One of the most satisfying closed terrarium builds is a woodland-floor recreation using sheet moss, miniature ferns, and a piece of cholla wood or cork bark as a focal element. The moss establishes quickly and functions as a living humidity regulator, while ferns provide vertical structure and canopy contrast. This build requires zero fertilizer for the first year — organic breakdown in the substrate supplies sufficient nutrition. If you also cultivate medicinal plants alongside your terrarium hobby, our guide on 10 medicinal and herbal plants to grow at home identifies species that can start in small glass containers before transitioning to larger pots as they mature.

The Desert Succulent Bowl

A shallow glass bowl six to eight inches deep, planted with three to five succulent species at varying heights, creates a visually rich display with minimal upkeep. Group plants that share identical light and water tolerances — pair low-light haworthia with brighter-light echeveria only if you can position the entire arrangement near consistent direct morning sun. Pest pressure is lower inside terrariums than in open beds, but scale insects and spider mites do appear occasionally. Our post on natural insecticides for plants at home covers effective, chemical-free solutions that are safe to apply near glass enclosures without residue risk.

Terrarium Myths That Keep Beginners Stuck

Warning: Pebbles at the bottom of a closed terrarium do not replace a drainage hole — they simply relocate where water accumulates. Roots in waterlogged conditions rot regardless of which layer the water has pooled into.

Myth: Any Plant Works in a Closed Terrarium

This is the most expensive misconception in terrarium keeping. Succulents planted in a sealed, humid enclosure develop root rot within weeks. Cacti fare worse. The internal water cycle of a closed terrarium creates conditions these species never encounter in their native desert habitats — persistent moisture, limited airflow, and dim indirect light. Stick to species that evolved in moist, shaded, humid environments: ferns, mosses, selaginella, fittonia, and miniature tropical orchids. If a plant's native habitat is described as semi-arid or desert, it belongs in an open build. No exceptions.

Myth: Terrariums Are Zero-Maintenance

A closed terrarium is low-maintenance, not maintenance-free. You'll still need to trim fast-growing plants that threaten to crowd out smaller specimens, remove yellowing foliage before it promotes rot, and occasionally open a sealed lid for a few hours when condensation becomes so dense it obscures the glass. Open terrariums and succulent builds require regular watering, periodic pruning, and substrate top-ups as material compacts over time. The discipline is lighter than maintaining an equivalent outdoor raised bed, but calling any terrarium zero-maintenance is a setup for disappointment.

Long-Term Strategies for a Terrarium That Ages Well

Watering Discipline Over Time

The most common cause of long-term terrarium failure is overwatering — particularly in closed builds where the self-sustaining water cycle creates a false sense of full autonomy. In practice, inspect moisture levels monthly. Press your fingertip one inch into the substrate and add water only when that layer feels completely dry. For open terrariums and succulent styles, establish a consistent schedule and adjust for seasonal evaporation rates — these containers dry out faster in summer and in centrally heated interiors. Track your watering intervals for the first three months. You'll identify the rhythm quickly enough to stop needing the log.

Pruning and Plant Replacement

Plants in closed terrariums grow more slowly than in open air, but they do grow. Fast-spreading species like selaginella and sheet moss will eventually crowd out smaller specimens if left unchecked across a season. Prune back any plant that contacts the glass walls — moisture trapped between leaf and glass is a direct vector for mold. In open and succulent terrariums, replace any plant that has definitively outgrown its footprint rather than forcing it back into shape with aggressive pruning. A well-timed removal keeps the entire composition visually intentional and the remaining plants healthier for it.

The Honest Pros and Cons of Each Terrarium Type

Closed and Tropical Builds

The self-watering cycle is a genuine advantage for busy plant owners. Once properly established, a well-built closed terrarium can go two to four weeks without any intervention. The tradeoff is a steeper initial learning curve — you must master moisture balance at setup, because errors compound in sealed environments. Mold, root rot, and algae are all consequences of excess moisture with nowhere to escape. Start with a small jar and a clump of moss before committing to a large-scale tropical display. Master the small build first, and the larger builds become predictable.

Open and Succulent Builds

Open terrariums and succulent-style builds are the more forgiving entry point for beginners. Mistakes are recoverable — overwatering dries out; underwatering signals through visible wilt early enough to correct. The tradeoffs are a narrower plant palette and a higher maintenance frequency. You're limited to drought-tolerant species, which eliminates the dramatic lush greens that closed tropical builds deliver. For most first-time terrarium builders, starting with an open succulent container is the strategically sound choice: you develop your eye for plant composition and substrate preparation without the unforgiving moisture management demands of a sealed system.

Frequently Asked Questions

Key Takeaways

• The open-versus-closed distinction is the single most consequential decision in terrarium building — it determines plant compatibility, humidity level, and your entire long-term maintenance rhythm.
• Closed and tropical terrariums are exceptionally low-maintenance once established, but they demand precise moisture management at setup; open and succulent builds are more forgiving and the better starting point for beginners.
• Every terrarium type benefits from a three-layer substrate system — drainage material, activated charcoal, and species-appropriate growing medium — regardless of whether the enclosure is sealed or open.
• The most common failure mode across all the different types of terrariums is overwatering; develop the habit of checking substrate moisture with your fingertip before adding any water at all.