Greenhouse
The 
Greenhouse is located in 
Merry Meadow near the 
Merry Meadows Overlook. It is unlocked once the player has completed the "Grand Garden Gathering" quest. Inside the building is a flower patch ideal for growing and breeding flowers of all types. The size of the flower patch can be expanded using 
Worm Tails, 
Fertilizer, and 
Pollen Puffs to create more of its uniquely rich, deep soil.
Usage
The Greenhouse is a very powerful tool for gardeners.
Normal flower patches only have a 10% chance of a new seed or plant spawning in an empty flower plot for every fertilized flower touching the plot. Without Fertilizer, barely any new spawns will appear. Low spawn rates mean that breeding two flowers without Fertilizer is very unlikely. Normal flower patches also have limited flower compatibility, depending on their biome.
However, the Greenhouse does not need Fertilizer for plants to breed. It has a 100% spawn rate in any empty plot touching a plant, meaning that the player can easily get more opportunities at successfully crossbreeding without having to fertilize at all. The only reason to use Fertilizer in the Greenhouse is if the player is attempting to apply a default pattern to a plant.
Outside of not requiring Fertilizer, flowers still follow the normal breeding rules, like requiring a patterned flower to transfer color from one flower type to another.
The Greenhouse is compatible with flowers from all biomes. That means flowers from any biome can be planted near each other, even flowers as different as the 
Heavy Nettle and 
Anemone.
There are four exceptions: flowers that can only grow in extreme conditions and cannot be planted in the Greenhouse.
Frostfeathers can only be grown in the extreme cold of 
Icy Peak.
Blazebulbs can only be grown in the extreme heat of the 
Caldera.
Crystalias can only be grown in the unique conditions of the 
Crystal Caves.
Bubbalunas can only be grown in the unique conditions on the 
The Moon.
The Greenhouse even allows event flowers to breed outside of their 
Event. It is the only way new colors of event flowers, such as the 
Marigold and the 
Eggwort, can be bred after their Event has ended. The player must still initially obtain event plants/seedlings during their Event, as seedlings cannot be traded and event flowers cannot be turned into seeds.
Greenhouse Upgrades
The Greenhouse can be upgraded by 
interacting with the flower sign on the right side of the building. There are a total of 5 upgrades for the Greenhouse. From start to finish, the Greenhouse requires 640x Worm Tails, 6000x Fertilizer, and 4950x Pollen Puffs to fully upgrade.
| Upgrade # | Cost | Total Available Plots | Interior |
|---|---|---|---|
| 0 | Default | 6 plots (2x3) | 
|
| 1 | Worm Tail (100)
|
12 plots (3x4) | 
|
| 2 | Worm Tail (115)
|
25 plots (5x5) | 
|
| 3 | Worm Tail (130)
|
45 plots (9x5) | 
|
| 4 | Worm Tail (145)
|
81 plots (9x9) | 
|
| 5 | Worm Tail (150)
|
100 plots (10x10) | 
|
How to Unlock
The quest that unlocks the Greenhouse is "Grand Garden Gathering" quest. Below is a step-by-step guide on how to unlock the Greenhouse.
| Step # | Requirement | Details |
|---|---|---|
| 1 | Complete the "Green Thumbs" quest. | Must have:
|
| 2 | Complete the "Mulch Be Well" quest. | Must have:
|
| 3 | Complete the "Dig It Up" quest. | Must have:
|
| 4 |  Lou must be a  5-star resident.
|
|
| 5 | Complete the "Beach Blossoms" quest. | Must have: |
| 6 |  Aro must be a 5-star resident.
|
|
| 7 | Complete the "Fen Flora" quest. | Must have:
|
| 8 |  Poco must be a 5-star resident.
|
|
| 9 | Complete the "Wild Mountain Time" quest. | Must have:
|
| 10 |  Chico must be a 5-star resident.
|
|
| 11 | Complete the "Fiery Flowers" quest. | Must have:
|
| 12 |  Marin must be a 5-star resident.
|
|
| 13 | Complete the "Reefside Riches" quest. | Must have:
|
| 14 |  Lutz must be a 5-star resident.
|
|
| 15 | Complete the "Grand Garden Gathering" quest. | Must have:
This quest will unlock the |
Gallery
Interacting with the sign
Upgrade screen for 1st expansion
Upgrade screen when fully expanded
Greenhouse Upgrade Chart
Greenhouse Map Location
Greenhouse Information
Some recommended greenhouse layouts.
Greenhouse layouts if duplicating flowers.
Greenhouse sticker.
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