Greenhouse

A greenhouse is a specialized structure that grants an additional 5°C of warmth to certain block entities inside it.

Because the game code uses "roomness" for several structures, see Room page for details.

Overview

Handbook's guide on Greenhouses
Once you have obtained glass , you can make a greenhouse to extend your growing season. Any farmland, fruit tree or berry bush inside the greenhouse will receive a +5 degree temperature boost.
The maximum interior volume on a single greenhouse is 14x14x14 blocks. The roof of the greenhouse must be at least 50% glass (full block or slab, can also be chiseled glass as long as one side is solid). The walls can be of any material, and can be shared between greenhouses. If you use glass slabs for roof or walls, the base or main 'flush' side (matching other blocks) must be oriented inward.

All crops stop growing below 0°C. In most parts of the world, an extra 5°C isn't enough to enable year-round farming. But it can enable a crop to finish maturing in late autumn, or enable sowing a few days sooner in spring. Nutrient and moisture levels have a bigger impact than greenhouse on how many harvests you can achieve in a year. See Guide:Farming for more tips.

Troubleshooting

It shouldn't take more than 4 game-hours for the +5°C temperature boost to show up in the Block Info Overlay for farmland.

Crude doors and sleek doors do not contribute to a valid room. {{ll|Solid doors and trapdoors do.

In a singleplayer world, the player has the ability to use server commands. /debug rooms hi will turn the space around the player green if the space meets the conditions for a valid "room" and red if it doesn't meet the conditions. There's no visual indicator what the point of failure is. Use the command after each revision to check for validity. When finished, use /debug rooms unhi to un-highlight the space.

Water below farmland does not contribute moisture. It also prevents being counted as a valid "room." If a greenhouse is built over a pond or lake, the player needs to place a full solid block underneath each block of tilled farmland.