We Tried the 7 Best Terrarium Kits for Beginners in 2026

A terrarium is the rare houseplant project that mostly runs itself once it's balanced, which is exactly why it appeals to people who kill pothos. The trick is starting with the right container, drainage layers, and plants matched to how much light you have. We assembled and monitored a range of kits over several weeks to see which ones actually stay alive.

Quick verdict

For most beginners the best terrarium kit is a sealed glass jar setup with tropical plants and a self-sustaining water cycle, because it needs watering only every few weeks. Fenwick's closed kit is our overall pick for completeness, Mkono's geometric glass is the best-looking open build, and Back to the Roots is the easiest hands-off starter for kids and desks.

The best terrarium kits, ranked

1. Fenwick Closed Terrarium Kit — best overall

Best for: beginners who want everything in one box

This sealed kit ships with a lidded glass vessel, activated charcoal, substrate, moss, and tools, so you build a self-cycling ecosystem without sourcing parts. The closed design traps humidity, meaning you water it roughly once a month instead of weekly.

2. Mkono Geometric Glass Terrarium — best open-air succulents

Best for: dry, bright rooms and design-minded builders

The faceted glass house looks like decor and suits succulents and air plants that need airflow rather than trapped humidity. It's an open build, so it forgives overwatering less but rewards you with a sculptural centerpiece.

3. Back to the Roots Terrarium Kit — best hands-off starter

Best for: kids, classrooms, and office desks

This grow-from-seed style kit keeps the barrier low with pre-measured components and clear steps. It's the most forgiving option here for a first-ever attempt or a gift.

4. NCYP Cube Glass Terrarium — best tropical moss builds

Best for: people who want a rainforest look

The tall cube geometry gives ferns and moss vertical room and holds humidity well when partly covered. Its open top lets you tune moisture by adjusting how much you leave uncovered.

5. The Zen Succulent DIY Kit — best gifting

Best for: someone buying for a plant-curious friend

Curated by a small studio, this kit leans into presentation with matched stones, sand, and a healthy starter plant. It arrives ready to assemble in one sitting, which makes it a reliable present.

6. Twig Terrariums Kit — best custom miniature scenes

Best for: hobbyists who want to add tiny figurines

Twig's kits are built around personalization, pairing living moss with room for little models and landscaping. It's the pick if the fun is in the diorama as much as the plants.

7. Mkono Hanging Glass Terrarium — best small spaces

Best for: renters short on shelf and counter space

The teardrop hanging globe frees up surfaces and suits air plants that draw moisture from humidity rather than soil. Hang it near indirect light and it needs only occasional misting.

How we tested

We assembled each kit following its included instructions, then ran the finished terrariums side by side on a north- and east-facing sill for several weeks. We tracked condensation cycles in closed builds, watched for mold and rot, noted how complete each parts list was, and judged how clearly the instructions guided a true beginner. Plant survival and how little intervention each needed carried the most weight.

Frequently asked questions

Are closed or open terrariums easier for beginners?

Closed terrariums are usually easier because the sealed environment recycles moisture and needs watering only every few weeks. Open terrariums suit succulents and air plants but are less forgiving of overwatering and dry out faster.

How often do you need to water a terrarium?

A well-balanced closed terrarium may need water only once every three to six weeks, signaled by little to no condensation on the glass. Open terrariums with succulents typically want a light watering every one to two weeks depending on humidity.

Do terrariums need direct sunlight?

No. Most terrarium plants prefer bright, indirect light; direct sun through glass can overheat a sealed jar and cook the plants. An east-facing window or a spot a few feet from a bright window works well.

Why does my terrarium keep growing mold?

Mold usually means too much moisture, poor airflow, or decaying plant matter. Remove affected leaves, crack the lid to let it dry out for a day or two, and make sure you included a charcoal layer, which helps keep the ecosystem clean.

Last updated: July 2026. These rankings reflect We Tried It All's hands-on evaluation and are refreshed as we test new models.