An open container is the better choice for most succulent terrariums. It allows moisture to escape and air to circulate around the plants, helping the growing medium dry between waterings. A closed container holds moisture inside, creating conditions better suited to humidity-loving plants.
However, removing the lid is only part of the answer. The opening’s size, the container’s depth and the way excess water leaves the root zone all affect whether your succulents stay healthy.
For a succulent terrarium in Singapore, choose the container around the plants’ needs and your intended display spot. A beautiful bowl becomes much easier to maintain when its design supports everyday care.
Why a Closed Container Creates Problems
Inside a closed terrarium, water evaporates from the growing medium and escapes from leaves, then condenses on the container’s surfaces. Much of that moisture returns to the planting.
This helps moisture-loving plants, but it makes the drying cycle difficult for many familiar succulents. Echeveria, jade plants and similar varieties generally struggle when their roots remain wet for prolonged periods.
The problem is more than humid air alone. Persistently waterlogged growing medium contains less oxygen around the roots, increasing the risk of root damage and rot.
Opening the lid occasionally does not necessarily solve this. If you close it again while the planting remains damp, the moisture is still largely trapped. A permanently open arrangement is a more practical choice.
Not Every Open Container Works Equally Well
A bottle with its cork removed is technically open, but its narrow neck still restricts air exchange. A wide opening gives moisture a clearer escape route and makes maintenance easier.
When choosing a container, look for:
- A broad opening: You should be able to reach the plants and soil comfortably.
- Suitable depth: Allow space for the roots without adding an unnecessarily deep mass of growing medium.
- Room around the foliage: Avoid pressing leaves against the walls or neighbouring plants.
- A stable base: The arrangement should remain steady during watering and cleaning.
A low, wide vessel generally exposes more of the planting to room air than a tall jar with a small opening. It also makes it easier to remove fallen leaves and check the soil.
You can explore the open terrarium workshop in Singapore when considering this style of arrangement.
An Open Top Does Not Replace Drainage
Ventilation and drainage do different jobs. The opening allows air and water vapour to move; drainage holes let excess liquid water leave.
A glass bowl without drainage holes retains whatever water you add until the plants use it or it evaporates. Even with an open top, the lower growing medium can remain wet while the surface looks dry.
Pebbles at the bottom do not turn that bowl into a draining container. Water still has nowhere to exit, and a gravel layer cannot reliably protect roots from excessive moisture.
For easier long-term care, consider growing the succulents in removable pots with drainage holes, placed inside the decorative vessel. Lift them out for watering, let them drain fully, then return them without leaving water underneath.
If planting directly into a glass container, recognise the narrower margin for watering mistakes. An open bowl can work, but it requires closer observation than a draining planter.
Choose the Growing Medium and Plants Together
Use a porous succulent growing mix rather than dense garden soil or a moisture-retaining mix intended for tropical foliage.
Mineral ingredients such as pumice or perlite help create air spaces in the root zone. Mix suitable amendments throughout the growing medium; placing stones beneath unsuitable soil does not correct the soil itself.
Choose plants with compatible light and watering needs. “Succulent” covers a broad group, so matching leaf colours is not enough.
For example, some Haworthia varieties suit bright, filtered light, while many Echeveria need stronger light to retain compact growth. Ask about the exact plants before combining them.
Avoid adding living moss simply to fill gaps. Keeping moss consistently moist can conflict with the drying conditions your succulents need. Use restrained decorative details and leave room to inspect the planting.
Account for Singapore’s Indoor Conditions
An open container takes on the conditions around it; it does not create dry air by itself. In Singapore’s humid conditions, airflow and the actual drying rate of the growing medium deserve particular attention.
Place the arrangement where it receives bright light appropriate to its plants. A dim office desk can be unsuitable even when the container looks perfect there.
Avoid putting a tall glass vessel in strong afternoon sunlight. Heat can build up inside, and plants accustomed to gentler light may scorch. Increase light exposure gradually when moving an established arrangement.
Air-conditioning may change how quickly the planting dries, but it does not make a fixed watering schedule reliable. Check the soil after changes in location, weather or room use.
On a sheltered balcony, also consider wind-driven rain. A drainage-free bowl can collect more water than intended during a shower.
Water According to the Roots, Not the Calendar
Check below the decorative surface before watering. Dry stones on top do not prove the root zone is dry. A wooden skewer inserted carefully into the growing medium can help reveal moisture beneath the surface.
For a removable pot with drainage holes, water the root ball thoroughly and allow excess water to escape. Let the growing medium dry before watering again.
For a directly planted, drainage-free bowl, apply water slowly to the growing medium with a narrow-spouted container. Avoid flooding the base or leaving water pooled between leaves. There is no universal spoonful measurement that suits every arrangement.
Frequent misting is a poor substitute for watering the roots. It can repeatedly wet the foliage without properly moistening the root ball.
If you see soft, translucent leaves or a darkening stem base while the soil is wet, stop watering and inspect the roots. Simply removing a lid may not rescue an already deteriorating plant.
Make Care Part of the Workshop Design
EPIC Workshops’ succulent terrarium workshop includes guidance on planting and maintenance, with succulents, substrates and decorative materials used to create a glass-container arrangement.
Use that guidance to connect your design with its future home. Tell the trainer whether the terrarium will sit beside a window, on a balcony or in an air-conditioned office.
Before taking it home, confirm the plant names, suitable lighting and how to assess moisture in that particular container. Those details are more useful than a general instruction to “water occasionally”.
Frequently Asked Questions
Can I leave the lid slightly ajar?
A small gap provides limited ventilation. Removing the lid completely is preferable, although a narrow-necked jar may still be unsuitable.
Can succulents and ferns share one terrarium?
Usually, they are a poor pairing. Most terrarium ferns prefer more consistent moisture than drought-adapted succulents.
Does condensation mean my succulent needs water?
No. Condensation shows that moisture is present. Check the growing medium rather than adding water because the glass looks misty.
Can I reuse a closed terrarium jar?
Yes, if removing the lid leaves a sufficiently wide opening and the shape allows easy maintenance. Otherwise, choose another vessel.
Will my succulents stay small inside the container?
No. Healthy plants can outgrow the arrangement. Allow space initially and move crowded plants into suitable pots as they develop.