# Glass Jar Garden

> A terrarium simulator in your browser. Layer the soil, plant real species, add springtails and isopods, seal the jar and watch moss creep, plants grow and the water cycle run, day by day.

Free, in the browser, no account. Built by Arbaz Siddiqui (https://www.arbazsiddiqui.me).

## The simulator

- [Open the simulator](https://glassjar.garden/): build a terrarium layer by layer, plant it, seal it and watch it live.
- [About](https://www.arbazsiddiqui.me/glass-jar-garden/): what it simulates and who made it.

## Starter jars

- [Beginner jar](https://glassjar.garden/starter-jars/beginner-jar/): easy, sealed jar forest. Open it: https://glassjar.garden/?starter=beginner_jar
- [Moss jar](https://glassjar.garden/starter-jars/moss-jar/): easy, sealed moss bowl. Open it: https://glassjar.garden/?starter=moss_jar
- [Woodland jar](https://glassjar.garden/starter-jars/woodland-jar/): medium, sealed jar forest. Open it: https://glassjar.garden/?starter=woodland_jar
- [Bottle garden](https://glassjar.garden/starter-jars/bottle-garden/): medium, sealed bottle garden. Open it: https://glassjar.garden/?starter=bottle_garden
- [Bioactive tank](https://glassjar.garden/starter-jars/bioactive-tank/): medium, sealed bioactive. Open it: https://glassjar.garden/?starter=bioactive_tank
- [Paludarium lite](https://glassjar.garden/starter-jars/paludarium-lite/): hard, sealed paludarium-lite. Open it: https://glassjar.garden/?starter=paludarium_lite
- [Carnivore bog](https://glassjar.garden/starter-jars/carnivore-bog/): medium, sealed bog. Open it: https://glassjar.garden/?starter=carnivore_bog
- [Desert bowl](https://glassjar.garden/starter-jars/desert-bowl/): easy, open desert / open. Open it: https://glassjar.garden/?starter=desert_bowl
- [Cloche garden](https://glassjar.garden/starter-jars/cloche-garden/): easy, sealed cloche. Open it: https://glassjar.garden/?starter=cloche_garden
- [Mason jar moss](https://glassjar.garden/starter-jars/mason-moss/): easy, sealed moss jar. Open it: https://glassjar.garden/?starter=mason_moss
- [Pocket jar](https://glassjar.garden/starter-jars/pocket-jar/): medium, sealed tiny moss jar. Open it: https://glassjar.garden/?starter=pocket_jar
- [Test tube moss](https://glassjar.garden/starter-jars/test-tube/): medium, sealed moss in a tube. Open it: https://glassjar.garden/?starter=test_tube
- [Cookie jar ferns](https://glassjar.garden/starter-jars/cookie-ferns/): easy, sealed jar forest. Open it: https://glassjar.garden/?starter=cookie_ferns
- [Moss and stone](https://glassjar.garden/starter-jars/moss-and-stone/): easy, sealed Japanese moss garden. Open it: https://glassjar.garden/?starter=moss_and_stone
- [Forest floor](https://glassjar.garden/starter-jars/forest-floor/): medium, sealed leaf litter woodland. Open it: https://glassjar.garden/?starter=forest_floor
- [Rainforest tank](https://glassjar.garden/starter-jars/rainforest-tank/): medium, sealed tropical vivarium. Open it: https://glassjar.garden/?starter=rainforest_tank
- [Wardian case](https://glassjar.garden/starter-jars/wardian-case/): medium, sealed Victorian fern case. Open it: https://glassjar.garden/?starter=wardian_case
- [Riverbank jar](https://glassjar.garden/starter-jars/wet-jar/): medium, sealed wet jar with aquatic moss. Open it: https://glassjar.garden/?starter=wet_jar
- [Isopod habitat](https://glassjar.garden/starter-jars/isopod-habitat/): easy, sealed bioactive crew tank. Open it: https://glassjar.garden/?starter=isopod_habitat
- [Pitcher plant globe](https://glassjar.garden/starter-jars/pitcher-globe/): hard, sealed carnivore globe. Open it: https://glassjar.garden/?starter=pitcher_globe
- [Faceted succulents](https://glassjar.garden/starter-jars/succulent-facet/): easy, open open succulent planter. Open it: https://glassjar.garden/?starter=succulent_facet
- [Air plant lantern](https://glassjar.garden/starter-jars/air-plant-lantern/): easy, open open airy display. Open it: https://glassjar.garden/?starter=air_plant_lantern
- [Bulb garden](https://glassjar.garden/starter-jars/bulb-garden/): medium, sealed hanging bulb. Open it: https://glassjar.garden/?starter=bulb_garden
- [Moss bottle](https://glassjar.garden/starter-jars/moss-bottle/): easy, sealed bottle of moss. Open it: https://glassjar.garden/?starter=moss_bottle
- [Mini forest](https://glassjar.garden/starter-jars/mini-forest/): medium, sealed tall jar forest. Open it: https://glassjar.garden/?starter=mini_forest
- [Cliff face](https://glassjar.garden/starter-jars/cliff-face/): hard, sealed stone wall vivarium. Open it: https://glassjar.garden/?starter=cliff_face

## Basics

- [The jar](https://glassjar.garden/guide/basics/the-jar/): A sealed jar waters itself: plants breathe water out, it beads on the glass and runs back down.
- [Layers](https://glassjar.garden/guide/basics/layers/): Bottom to top: drainage, a barrier, soil, then a top dressing.
- [Plants](https://glassjar.garden/guide/basics/plants/): Small, slow and alike in what they want.
- [Moss](https://glassjar.garden/guide/basics/moss/): No roots: moss drinks from the air and the surface it sits on.
- [Cleanup crew](https://glassjar.garden/guide/basics/cleanup-crew/): Tiny animals that keep a jar from rotting.

## How it works

- [Needs and health](https://glassjar.garden/guide/how-it-works/needs-and-health/): Each day every living thing scores its needs; health follows the score.
- [Death and hazards](https://glassjar.garden/guide/how-it-works/death-and-hazards/): Only hazards kill, each rising from zero at its threshold.
- [Soil](https://glassjar.garden/guide/how-it-works/soil/): Layers drain, hold water, feed plants and set the pH the roots feel.
- [Water](https://glassjar.garden/guide/how-it-works/water/): Soil fills to what it can hold; the rest drains to the drainage layer.
- [Humidity and the lid](https://glassjar.garden/guide/how-it-works/humidity-and-the-lid/): Sealed jars keep every drop; open jars lose water to the room.
- [Light](https://glassjar.garden/guide/how-it-works/light/): The day's light, brightness times hours, drives growth.
- [Temperature](https://glassjar.garden/guide/how-it-works/temperature/): The jar follows the room, a little warmer under a lamp.
- [Plants](https://glassjar.garden/guide/how-it-works/plants/): Plants grow on light and food, share space, and stop at the lid.
- [Moss](https://glassjar.garden/guide/how-it-works/moss/): Moss creeps from its edges in damp air and browns back when dry.
- [Critters](https://glassjar.garden/guide/how-it-works/critters/): Each crew is a colony that grows to what the jar can feed.
- [Mould](https://glassjar.garden/guide/how-it-works/mould/): White mould blooms on fresh organics and leaves; springtails eat it.
- [Care](https://glassjar.garden/guide/how-it-works/care/): Mist, water, vent and tidy, by hand or on a routine.
- [Chance and forecasts](https://glassjar.garden/guide/how-it-works/chance-and-forecasts/): Two things are random; everything else repeats exactly.

## Encyclopedia

- [Plants](https://glassjar.garden/guide/plants/): Every plant you can grow, with the light, humidity, temperature and soil it needs, and what kills it. 49 entries.
- [Moss](https://glassjar.garden/guide/moss/): Carpet, cushion and aquarium mosses: how fast they spread, where they grow, and the air they need. 31 entries.
- [Critters](https://glassjar.garden/guide/critters/): The cleanup crew: springtails, isopods, worms and snails, what they eat and how big a colony a jar can feed. 10 entries.
- [Soils and layers](https://glassjar.garden/guide/soils/): Drainage, filters, soils and top dressings: how much water each holds, its pH, and how fast it rots down. 41 entries.
- [Stones and wood](https://glassjar.garden/guide/hardscape/): Stones and wood for the scene, and which mosses can climb them. 32 entries.
- [Moulds and films](https://glassjar.garden/guide/moulds/): The fuzz, films and diseases a jar can grow, what sets them off and what keeps them down. 10 entries.

## Using it from an agent

- Every page has a Markdown copy: add index.md to its path (for example https://glassjar.garden/guide/plants/index.md).
- Open a starter jar directly: https://glassjar.garden/?starter=<key>, with the keys listed above.
- Open the in-app guide at an entry: https://glassjar.garden/?guide=plants/fittonia-albivenis.
- The simulator needs a browser with WebGL; the guide and recipes are plain HTML.
- In a browser with WebMCP, the app registers tools: list_starter_jars, open_starter_jar, find_guide_entries, open_guide, get_current_jar, share_current_jar.
- The share-link API is listed at https://glassjar.garden/.well-known/api-catalog (OpenAPI at https://glassjar.garden/api/openapi.json).

## Full text

- [llms-full.txt](https://glassjar.garden/llms-full.txt): every mechanism and every entry with its numbers, in one plain-text file.