Greenhouse Construction

A greenhouse is a sealed room that maintains a controlled growing atmosphere — temperate, oxygenated and pressurised — regardless of the world outside. It is what lets high-tier crops, and any crop in a hostile world (Nether, End, or a Nerospace planet), grow at all. See Growth Conditions for when sealing is required.

Building one#

1. Enclose an airtight room out of any solid blocks. Greenhouse Frame and Greenhouse Glass are the intended shell, but any full solid block counts as a wall — there must be no gaps to the outside.
2. Fit a Greenhouse Door in a wall so you can walk in and out — as an airlock it never breaks the seal (see below).
3. Place a Greenhouse Controller as part of the shell, touching the interior.
4. Supply the controller with Nero Flux (NF) and, if crops are inside, Nutrient fluid.

The controller flood-fills the interior air pocket, bounded by the surrounding solid blocks and capped by the configured volume limit. Crops (and empty air) count as interior; grow beds and walls are boundary. The check runs on a slow safety interval (a few seconds by default) — never every tick.

The Greenhouse Controller's screen carries this build guide in-GUI: a panel down its left-hand column walks through the shell, door, and power steps (with a cross-section sketch), so a greenhouse can be built without leaving the game.

The Greenhouse Door (airlock)#

The Greenhouse Door is a two-block-tall metal-and-glass door, opened and closed by hand like a wooden door (no redstone needed). It is the intended way in and out of a sealed greenhouse.

Airlock seal semantics: both halves of the door count as valid sealing shell blocks whether the door is open or closed. The enclosure check treats the door itself as a wall in every state, so opening it to walk through never breaches the greenhouse, and revalidation will never flag an open door as a leak. (An open door still occupies its block — the interior fill stops at it either way.)

Crafting — shaped, yields 3 doors (a glazed upper panel on a framed base):

Like any door, it drops itself when the lower half is broken, and it is part of the vanilla doors tags.

Powering and upkeep#

While formed, the controller spends NF scaled to the interior volume and Nutrient fluid scaled to the number of crops inside, each upkeep interval. If it cannot pay, the greenhouse drops to Unpowered and its interior stops being controlled until power returns. All rates and the volume cap are server config values under the greenhouse.* keys.

Status#

Right-click the controller to read its state (formed, breached, unpowered, or unformed), interior volume, active crop count, stored NF and Nutrient, and — if breached — the leak position that pushed the fill past the cap.

See also: Greenhouse Troubleshooting.