Air plants and succulents are the two easiest ways to keep something alive on a shelf, and they are regularly confused. They want different things, fail in different ways and suit different displays. Here is the straight comparison, ending with which to choose for your space.
The difference at a glance
- Air plants (Tillandsia) grow without soil, drink through their leaves, and need a proper soak every week or two plus good airflow. They can perch anywhere: glass, wood, wire, a bowl of pebbles.
- Succulents grow in soil, store water in their leaves, and want a sparing drink only when the soil is fully dry, plus brighter light than most people give them.
Light
Succulents are the hungrier of the two: they want bright light and take direct sun happily, and they stretch and fade on dim shelves. Air plants prefer bright but indirect light, which makes them more forgiving in typical UK rooms where direct sun is rationed. If your spot is a metre from a window, both work; if it is the middle of the room, choose an air plant and even then expect slow decline rather than thriving.
Watering, honestly
Air plants: soak face-down for 20 to 30 minutes every one to two weeks, shake off, dry upside down, done. Misting alone is not enough. The full routine is in our air plant care guide. Succulents: water the soil sparingly when it is bone dry, perhaps fortnightly in summer and barely at all in winter. Both die the same way: overwatering and trapped moisture. Neither dies from a missed week.
Display: where each shines
Air plants are the display champions because they need no pot and no soil: they sit in an open glass vessel over pebbles, on a piece of wood, in a hanging globe. Succulents need their soil, so they either stay in a hidden pot or are planted into a layered arrangement with grit and sand, which looks wonderful but takes more setting up.
Which suits a terrarium?
Both, provided the vessel is open. Air plants are the easiest possible terrarium residents: lift out, soak, put back. Succulents suit a planted scene with drainage grit under the soil. Neither belongs in a sealed jar, where trapped moisture rots them; if you are weighing vessel types, read open vs closed terrariums. Every vessel in our glass terrarium collection is open by design, on brass frames or tung wood bases, and suits either plant.
Cost and lifespan
Both are cheap to start: a few pounds per plant from a garden centre. Air plants grow slowly, flower once and then produce pups that replace the parent, so one plant quietly becomes a small colony. Succulents grow steadily for years and propagate from single leaves. Neither is a short-term purchase if watered with restraint.
So which should you choose?
- Choose air plants if your light is decent but not direct, you want plants perched in glass or on wood with no soil in sight, and you like a fortnightly ritual rather than a schedule.
- Choose succulents if you have a genuinely bright windowsill, want the classic potted look, and prefer watering to soaking.
- Choose both if you have an open terrarium each: they are the two best starter plants there are, and they fail for the same single reason, too much water, which makes them easy to learn together.
Whichever you pick, our glass terrarium guide covers building the display around them.
