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To make a basic terrarium, use a clear lidded container, fresh low-fertility soilless mix, one to three small humidity-loving plants, and a little horticultural or activated charcoal. Plant into lightly damp—not muddy—soil, water sparingly, and place the finished terrarium in bright indirect light. A gravel layer is optional, not essential.
The easiest beginner terrarium is a small closed terrarium: use a clear lidded container, fresh low-fertility soilless mix, one to three small humidity-loving plants, and a small amount of horticultural or activated charcoal. Add only a little water, then keep the finished terrarium in bright indirect light. The most common failures are too much sun, too much water, unsuitable plants, and overcrowding.
Closed or open terrarium: which should you make?
Choose the container type according to the plants, not just appearance.
| Type | Best for | Water and care |
|---|---|---|
| Closed | Mosses, small ferns, pilea, peperomia, baby’s tears, miniature begonias, and other humidity-tolerant woodland or tropical plants | The lid retains moisture. Light condensation is normal, and watering is infrequent once the moisture balance is right. |
| Open | Succulents, cacti, air plants, and plants that prefer quicker evaporation | Moisture escapes more readily, so the container generally needs more regular observation and watering. |
This guide focuses on a closed terrarium. Do not seal cacti or succulents in a humid jar; use them in an open terrarium or dish garden instead. Also avoid combining plants with sharply different light, humidity, or watering requirements.
Materials for a basic closed terrarium
- Clear container: a glass jar, bowl, or other transparent vessel. A tight-fitting lid is required for a closed terrarium. A wide opening is easiest for a first project.
- Fresh, low-fertility soilless potting mix: use terrarium soil or a suitable houseplant mix. Avoid heavy garden soil, which can compact and restrict air around the roots.
- One to three small plants: select slow-growing plants with similar humidity and light needs. Buy healthy, pest-free specimens and allow room for them to grow.
- Horticultural or activated charcoal: use a small amount mixed into the growing medium or as a thin layer if that is the method recommended by your kit or chosen instructions. Charcoal is not a substitute for correct watering and is not guaranteed to prevent mold.
- Optional decorations: clean stones, bark, driftwood, lichen, preserved moss, or a small non-toxic figurine.
- Useful tools: narrow spoon or terrarium shovel, chopstick, long tweezers, small scissors, and a mister or syringe.
A DIY terrarium kit can be a convenient way to bundle a jar, soil, moss, charcoal, tools, and decorations. Check the contents before buying: the documented kit option may not include live plants, and a kit is convenient—not essential. You can reuse a clean jar and source the materials separately.
Is a gravel layer necessary?
No. A thick layer of pebbles or gravel at the bottom is common in older terrarium instructions, but it is not required drainage infrastructure in a container without a drainage hole. Water can collect above the rock layer rather than draining away, creating a perched water table and potentially increasing root-rot risk.
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Use gravel only as an optional visual feature, especially in an open terrarium. Careful watering, an appropriate growing medium, and compatible plants matter more than a decorative rock layer. If you do add it, keep the layer modest and do not use it as permission to water heavily.
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Choose the plants and container together
Before buying anything, decide whether the plants need a humid closed environment. For this project, look for small, humidity-loving plants such as mosses, miniature ferns, pilea, peperomia, baby’s tears, or suitable miniature begonias. A local nursery or houseplant retailer is often the most practical place to find fresh, healthy small terrarium plants, but availability varies by region and season.
Choose a clear container large enough for the plants’ current root balls and expected growth. The plants should not touch the glass on every side or fill the jar completely at planting time. If the opening is narrow, make sure you have a way to reach the bottom with long tools.
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Clean the container and tools
Wash the vessel with soap and hot water, rinse it thoroughly, and let it dry. Clean your hands or gloves, spoon, tweezers, chopstick, scissors, decorations, and plant pots as well. Do not leave glass-cleaner fumes inside the container. Starting clean reduces the chance of introducing pests, pathogens, or decaying organic material into a humid enclosure.
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Prepare the growing medium
Use fresh, relatively low-fertility soilless potting mix. Add a small amount of horticultural or activated charcoal according to the method you are following, or place a thin charcoal layer if your kit specifies that arrangement. The mix should be slightly damp before planting—never muddy or dripping wet.
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If you are buying components separately, choose terrarium supplies that solve a specific step: a clear lidded terrarium jar, terrarium soil mix, horticultural charcoal, Long-handled terrarium tweezers, a plant mister, and optional preserved moss. None of these replaces the need to control moisture.
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Plan the layout before putting anything inside
Arrange the plants outside the container first. Use one taller plant as an anchor and smaller plants or moss toward the front. For a terrarium viewed from all sides, position the tallest plant near the center. For a display viewed mainly from one direction, place it toward the back.
Leave open space for growth, airflow, and pruning. A sparse-looking arrangement at first is usually easier to maintain than a crowded one.
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Add enough soil for the roots
Put in enough prepared mix to accommodate the largest root ball. You do not need to create a deep gravel drainage layer beneath it. Smooth the surface with a spoon or chopstick, then make a small planting well for each plant.
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Plant from the least accessible area outward
Place the smallest or most difficult-to-reach plants first. Remove each plant from its nursery container, loosen severely crowded roots gently, and set the root ball into its planting well. Firm the mix lightly around the roots so the plant stands upright, but do not compact the soil heavily.
Long tweezers, a narrow spoon, or a chopstick makes this step much easier through a small opening. Keep leaves and stems from being buried, and wipe soil from the glass as you work.
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Add decorations sparingly
Place only clean, non-toxic objects such as stones, bark, driftwood, lichen, preserved moss, or a small figurine. A few objects give the scene scale and visual interest. Too many can crowd the plants, obstruct airflow, trap debris, and make pruning difficult. Avoid collecting natural materials from places that may carry pests, disease, or chemical contamination unless they have been properly cleaned and prepared.
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Mist lightly and establish the moisture balance
Mist the soil and plants lightly, or add a very small amount of water with a syringe. It is easier to add water later than to remove excess water from a sealed container. The soil should be moist but not muddy, and there should be no standing water at the bottom.
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Place it in bright indirect light
Set the terrarium in a bright room or near a bright window, but out of direct sunlight. An east-facing window or a position set back from a sunny window can work well. Direct sun can heat the glass enclosure rapidly, causing leaf scorch, wilting, or fatal overheating even when the surrounding room feels comfortable.
Basic terrarium care
Watering
A closed terrarium normally needs very little water after its moisture cycle is established. Observe the soil and plants rather than following a fixed weekly schedule. Add a small amount only when the medium begins to dry or the plants show a genuine need. An open terrarium loses water faster and usually needs more frequent attention.
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Condensation
Light fogging, occasional droplets, and moisture that rolls down the glass are normal. Persistent heavy condensation, a constantly wet appearance, or puddling indicates an imbalance. Open the lid for a while, then close it again once the excess moisture has reduced. Repeat gradually rather than leaving the terrarium flooded or permanently open.
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Pruning and cleaning
Remove dead leaves promptly with clean scissors or tweezers. Trim damaged or overgrown growth before it presses against the glass or shades neighboring plants. Long tweezers are especially useful for removing debris from narrow containers. Avoid routine heavy fertilization: confined terrariums need little fertilizer, and excess nutrients can encourage unwanted growth or salt accumulation.
Mold and disease
Remove visibly infected plant material and dead leaves as soon as you notice them. Excess moisture, poor airflow, and contaminated plants or decorations are common contributors to mold and disease. Ventilate a very wet terrarium, but do not assume charcoal will solve a moisture problem; moisture control is the central treatment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to do when something goes wrong
| Symptom | Likely cause | Correction |
|---|---|---|
| Glass is heavily fogged all day | Too much water or insufficient ventilation | Remove the lid temporarily and let the container dry somewhat. Do not add more water until the soil needs it. |
| Standing water or muddy soil | Overwatering, often made worse by relying on a gravel layer | Ventilate. If necessary, carefully wick or remove excess water with a syringe or absorbent material. Allow the medium to become only lightly moist. |
| Plants wilt in a sunny window | Glass enclosure overheating or intense direct light | Move the terrarium to bright indirect light immediately. |
| Mold appears | Dead material, contaminated items, or excessive humidity | Remove affected material and debris, clean tools, and ventilate until the moisture level is balanced. |
| One plant declines while others look fine | Incompatible light, humidity, or watering needs | Remove and replace the unsuitable plant rather than changing the entire terrarium to suit one species. |
| The arrangement becomes crowded | Plants were planted too densely or have outgrown the container | Prune selectively, remove a plant, or rehome plants in a larger or open container. |
Beginner shopping checklist
Convenience option: an all-in-one DIY terrarium kit can bundle the container, growing materials, charcoal, moss, decorations, and basic tools. Confirm whether live plants are included before ordering.
Build-it-yourself option:
- Clear lidded terrarium jar or another transparent container
- Fresh terrarium potting mix or low-fertility soilless mix
- Horticultural or activated charcoal
- One to three compatible small humidity-loving plants
- Optional preserved moss, clean stones, bark, or driftwood
- Long-handled terrarium tweezers or a narrow tool
- Small scissors and a mister or syringe
Buy live plants from a nursery, garden center, or houseplant retailer when possible, selecting compact, healthy specimens with similar care requirements. Plant availability and suitability vary by location and season, so no single plant list works universally.
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- EASY-ACCESS SWING LID — The hinged top opens for planting, arranging, misting and routine care. Open the lid when additional airflow is needed, making it easier to adjust the environment compared with a completely sealed container.
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- DESIGNED FOR LIGHT WATERING, NOT STANDING WATER — This decorative plant terrarium is not intended to hold standing water. Use a drainage layer and water or mist according to your plants' needs. Terrarium only; plants, soil, stones and decorations are not included.
How to keep the project simple
- Start with a wide-mouth container; narrow jars are attractive but harder to plant and clean.
- Use fewer plants than you think you need and leave growing room.
- Skip the gravel layer unless you want it for appearance.
- Water conservatively and adjust only after observing the condensation and soil.
- Keep the terrarium out of direct sun.
- Never describe a closed terrarium as completely self-sustaining. A balanced one may need minimal care, but it can still require pruning, ventilation, occasional watering, plant replacement, or removal of decaying material.
Frequently Asked Questions
What is a closed terrarium?
A closed terrarium is a clear container with a lid that retains moisture. Condensation collects on the glass, runs down the sides, and helps create a small internal water cycle. It still needs observation, and may require ventilation, pruning, or occasional watering.
Do I need gravel at the bottom of a terrarium?
No. Gravel is optional and mainly decorative. In a container without a drainage hole, a gravel layer can create a perched water table rather than improve drainage. Correct watering and a suitable growing medium are more important.
Can I put succulents or cacti in a closed terrarium?
Avoid sealing cacti and succulents in a closed jar because sustained humidity is generally unsuitable for them. Use those plants in an open terrarium or dish garden instead.
How much condensation should a terrarium have?
Light condensation is normal. Heavy condensation that persists, saturated soil, or standing water indicates excess moisture. Remove the lid temporarily to ventilate the container and avoid watering until the medium is only lightly moist.
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Where should I put my terrarium?
Place it in bright indirect light, such as near an east-facing window or slightly back from a bright window. Avoid direct sun because the glass can heat the enclosure rapidly and damage the plants.
The Bottom Line
Bottom line: A successful basic terrarium depends less on a complicated layer recipe than on matching the plants to the container, using light soilless mix, watering sparingly, and providing bright indirect light. For a closed jar, choose humidity-tolerant plants; reserve cacti and succulents for an open setup.
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