Materials / Prepare your list

Terrarium supplies: what you need, and what you can leave out

Make a list for your plants’ roots, water, and maintenance before buying layers or accessories.

By Terrarium GuideSources & editorial method

The short answer

For a planted humid terrarium, gather an accessible clear container, compatible plants, suitable potting medium, water, and simple planting tools. Add a removable lid for a closed garden. Gravel, charcoal, moss, wood, and springtails each need a purpose; they are not a universal starter pack.

Open drying succulents need real drainage. Epiphytic air plants need an open, removable support rather than a soil bed. Carnivorous plants need a list for the identified plant, including its water quality and light requirements.

Evidence[2][3][5][6][7]

Pick the list that matches the planting

Four supply lists: choose a growing method before combining materials
Planting	Gather first	Add when needed	Leave out of this plan
Humid rooted foliage	Reachable clear vessel; compatible plants; airy moisture-retentive medium; water and planting tool.	Removable lid for closed growing; coarse base and permeable separator for a layered bed, or draining inner pots for separate care.	Decorative layers that leave too little root depth.
Open drying succulents	Suitable light; draining container or removable draining pot; freely draining medium.	Reachable saucer to catch and empty runoff around an inner pot.	Lid, wet moss bedding, or stones used instead of an outlet.
Epiphytic air plant	Open support; suitable water; space outside glass for watering and drying.	Stable cork or branch that supports the plant without trapping water at its base.	Potting soil around the base or constantly wet filler.
Venus flytrap example	Separate pot and tray; nutrient-poor medium; low-mineral water; strong light and seasonal plan.	Grow light if the chosen indoor method needs it.	Ordinary fertilized potting mix. Other carnivorous plants need different lists.

Evidence[3][5][6][7]

Follow the assembly steps for your list Choose the humid, succulent, air-plant, or flytrap branch.
Compare other carnivorous growing methods Check roots, light, water, and seasons first.

Scope and important limits

A useful fit when

Preparing a plant display without unnecessary purchases.
Checking which existing jars, pots, and tools can do the job.

Use another path when

A universal soil recipe, brand ranking, or animal enclosure equipment list.

These lists apply published guidance to practical displays. They are not tested product bundles or an assessment that differently managed plants can share one bed.

A basic tool group, before adding extras

Start by checking what you already own. The opening, tools, and watering spout matter more than a matching accessory set.

An empty wide-mouth glass jar and separate lid beside a bowl of dark medium, a narrow-spout jug, teaspoon, long tweezers, and small brush. — The spoon moves medium, tweezers reach a planting spot, and the brush clears loose particles. The pictured bowl is for rooted plants; neither its amount nor this jar suits every growing method.

Evidence[3]

Check the basics before buying extras

A container you can work insideEssentialTest the opening with the actual rootball, hand, and tool. Leave growing room and a removal route. A clean reused jar can work.
Evidence[3]
Plants with compatible needsEssentialConfirm names and eventual growing space. A small sales pot does not establish that the plant stays small.
Evidence[2]
Medium for the roots you are plantingConditionalRead ingredients and added fertilizer information. Buy for the identified plants; an epiphytic air-plant mount needs no soil bed.
Evidence[6][7]
Controllable planting and watering toolsEssentialA spoon or small trowel, small-spout watering container, and brush may suffice. Long tweezers help when they reach without damaging growth.
Evidence[3]
Supplemental lightConditionalCheck the growing position first. Add a lamp when natural light cannot support the plants; it cannot correct unsuitable roots.
Evidence[4][7]

Choose medium for the actual roots Compare moisture, air spaces, and specialist requirements.
Check plant identities and conditions Choose plants before committing to a shared list.

Similar bags can contain very different materials

Compare the visible structure first, then read the product description. A coarse mineral material, potting mix, and dried fiber do different jobs; none is a universal substitute for the others.

Three shallow pale dishes hold dark potting-medium-like material with light flecks on the left, coarse tan-gray mineral particles in the middle, and dry tawny moss-like fibers on the right. — Left to right: a loose organic-rich medium example, coarse mineral material, and dried long-fiber material. Appearance cannot confirm ingredients, added fertilizer, or suitability. These are separate examples, not a mixing ratio or a complete succulent recipe.

Evidence[2][5][7]

Read the label before choosing a bag

Check ingredients and added feedFind the actual ingredient and fertilizer information, rather than relying on “terrarium” or “natural” on the front. A flytrap’s nutrient-poor medium is a different choice from ordinary fertilized potting mix.
Evidence[7]
Name the job it will doDecide whether the product is a root medium, an amendment, a lower collection layer, or a surface finish. Coarse particles in a dish are not proof of a complete growing medium or an outlet in solid glass.
Evidence[3][4]
Check live, dried, or preserved statusFor moss products, look for the actual treatment and identity. Dried fiber used as a growing material and preserved decorative material do not become living cover when watered.
Evidence[7][9]

Which layers and extras earn their place?

For each item, ask what it does, how much space it takes, and how you will inspect or remove it.

Coarse base and separator: conditional

In a layered humid bed, washed coarse material provides lower collection space; a permeable separator limits fine medium mixing into it. Both take depth. Solid glass still has no outlet, so accumulated water must remain removable. A draining inner pot uses a different arrangement.

Evidence[3][4]

Charcoal: no substitute for water management

Published methods differ: some include horticultural charcoal, others build without it. It is not a required purchase for every method or a repair for saturated roots. Choose a coherent arrangement rather than combining every suggested layer.

Evidence[3][2][4]

Moss: a plant or a processed material?

Living moss needs an appropriate surface and moisture. Dried sphagnum is a growing material; preserved moss is not a living planting. Do not buy an unspecified green topping as a required finishing step.

Evidence[2][7][9]

Fertilizer: no automatic starter dose

A new humid terrarium generally needs no immediate feeding; excess growth complicates small spaces. Check existing medium and plant needs first. Ordinary root fertilizer is inappropriate for the beginner flytrap method.

Evidence[4][7]

Choose the base and water route Compare collection space, removable pots, and permeable dividers.
Check charcoal types and limits Separate optional horticultural use from adsorption claims and unsuitable residues.
Check living, dried, and preserved moss labels Choose by the actual plant or material identity.

Springtails: optional decomposers, not a repair kit

Springtails primarily feed on fungi, algae, pollen, and decaying organic matter. That soil-food-web role does not establish that adding a culture prevents all mold or creates a maintenance-free garden.

Evidence[8]

See one springtail in close view

A pale translucent springtail with a segmented elongated body, fine hairs, short legs, and long antennae, seen from the side on a dark organic surface. — Folsomia candida, as identified in the photographer’s record. The close view shows an elongated body and antennae; it is one example, not a guide for identifying every small organism or choosing a culture. Resized with the full frame retained. Image: Andy Murray · CC BY-SA 2.0

Confirm the organism and culture conditions with the supplier rather than matching color alone. The photograph does not show feeding, a terrarium population, or an outcome after adding springtails.

Evidence[1]

Check the culture before buying

For a humid organic planting, an intentionally sourced culture is optional once growing conditions are established. Check the supplier’s organism identity and culture requirements. Skip it if you cannot maintain those requirements; there is no universal stocking or feeding recipe here.

Do not keep a succulent bed wet for a cleanup crew or add food to hide a problem. Remove accessible dead material and check unwanted collected water. Many small jumping organisms outside the display warrant a moisture check, not automatic treatment or an assumption that every tiny organism is a springtail.

Evidence[8][4][5]

Understand the limits of decomposition and cycling Keep light, water, and growth checks in the routine.

Try placing a small stone before filling the vessel

Before adding medium, use tweezers to try the position of a small decorative stone beside the wood. Check that the tool and the item both pass through the opening without catching. Allow for future roots and foliage in the final arrangement.

A hand uses long tweezers to grip a small gray stone just above the clear central floor of an open rectangular glass case, with branching wood on the left and a larger flat stone at the right rear. — The tweezer tips hold a small stone while its position is checked beside the wood. Keep the tool route clear; use your hand or suitable support for larger pieces. This is an unfilled open-case check: the wood rises above the rim. A lidded vessel needs its lid fitted during the test, and the planted version still needs growing medium, root space, and secure support.

Evidence[2][3]

Choose and prepare wood, cork, and stones

Use hardscape for a support job or a deliberate landscape feature. These checks do not promise sterilization or permanent stability.

01
Choose a known material and purpose
Decide whether it supports an air plant or shapes the landscape. As a practical precaution, choose a known treatment history; omit painted, treated, crumbling, or unidentified found pieces rather than guessing what cleaning makes safe.
Evidence[2][6]
- Choose a support by its care route Compare removable supports and access for air-plant care.
02
Clean and inspect before assembly
Remove debris and clean small rocks or wood before adding them. Reject contaminated or unstable pieces. Cleaning does not prove they are pest-free or will never grow fungi.
Evidence[2][8]
- Follow the preparation and planting sequence Review cleaning, root-zone preparation, and safe assembly before planting.
03
Test stability and access
Seat pieces securely, clear of fragile growth, with access to roots. Test the lid too if the garden will be closed. Keep heavy pieces from loading onto fragile glass or roots. An air-plant support must remain removable and allow water to drain and the plant to dry.
Evidence[6][2]
- Dry-fit the layout and test future care Check the whole rootball or support, tools, and removal route.
04
Keep a removal option
Lift out a piece that blocks inspection, becomes unstable, or carries persistent unwanted growth. Reassess conditions rather than covering the problem with more material.
Evidence[4]
- Adjust a layout when care becomes difficult Check blocked access, changing growth, wetness, and removal needs.

Finish your list with a dry fit

Measure usable growing spaceAllow for actual rootballs, medium, pot or support, and future growth. Buy quantities from that space, not a universal jar-size recipe.
Try the route in and outTest tools, roots, and removable pots or mounts before filling the vessel.
Know where added water goesLocate roots, collection space, and a route for excess water to leave. A flytrap’s deliberate tray follows its separate routine.
Remove items without a jobKeep accessories only if you can explain their function and maintenance. Leave roots enough space.

Evidence[3][4][7]

Your next step

Assemble and plant the displayFollow the planting sequence and first observations.

Plan the rest of the build

More detail when you need it

Before you start

Explore more in materials

Sources and review

Folsomia candida — photograph and license · Andy Murray / Wikimedia Commons
Terrariums and bottle gardens · Royal Horticultural Society
Plants and Youth: Designing and Building a Terrarium · University of Florida IFAS Extension
How to Create and Care for a Terrarium · Iowa State University Extension and Outreach
Aloe vera — light, medium, and drainage · NC State Extension
Air plants · Royal Horticultural Society
Growing Dionaea muscipula · International Carnivorous Plant Society
Springtails — feeding and moisture context · University of Maryland Extension
Preserved reindeer moss — product treatment and care · Koch & Co