To solve the plant puzzle in We Were Here Tomorrow, you need to grow three plants in the Xenobotany greenhouse: Electric Area, Electric Hook, and Ultimate. The correct fertilizer combinations are Orange + Purple, Blue + Purple, and Blue + Red. However, mixing the right colors isn't enough. Each plant needs a specific pot and growing conditions, and both players must switch between the past and present to finish the puzzle.

The final objective is to grow and collect a Battery Bulb. Here's the complete solution, including which player handles each part and what to do if a plant won't grow.

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All Plant Seed Combinations
Greenhouse Puzzle Walkthrough
How to Get the Battery Bulb
Plant Puzzle Not Working

We Were Here Tomorrow Plant Puzzle Combinations

These are the seed combinations and pot locations needed to complete the greenhouse. Use the fertilizer colors rather than assuming the mixing station's handles are numbered in a particular order.

Seed	Fertilizers	Pot	Condition
Electric Area	Orange + Purple	D	Dry pot; no light plate needed
Electric Hook	Blue + Purple	E	Keep its light plate pressed
Ultimate	Blue + Red	C	Water required
Ladder (optional)	Green + Orange	E	Keep its light plate pressed

The Ladder plant is only relevant if you need extra height to reach the electrical connection above the Ultimate seed container. It's not one of the three plants required for the main solution.

Two greenhouse rules are particularly important. Pot C is the only watered planter, so the electrical seeds shouldn't go there. Pot E requires its light plate to remain activated for the Electric Hook plant to reach full growth.

How to Solve the Greenhouse Plant Puzzle

At the Overgrown checkpoint, the Hook Gun player begins in the present and the Goop Gun player begins in Rockbury, the past.

Anything planted in Rockbury affects the corresponding pot in the present. The player handling the fertilizer cannot directly inspect the finished plant in their own time period, so your partner should confirm each result before you move on.

Part 1: Reach the Greenhouse and Open the Climate Room

The first objective is to grow an electrical plant that restores access through the central climate room.

Hook Gun Player

In the present, find the open window above the research room.
Use your Hook Gun to reach the ledge and climb into the main hall.
Meet your partner at the nearby time glass and exchange time periods.
Now in Rockbury, pull the lock above the research room door with your Hook Gun.
Find an Electric Area seed and combine Orange + Purple fertilizers.
Plant the prepared seed in pot D, in the middle of the greenhouse.

Goop Gun Player

Use the time glass with your partner to enter the present.
Check the central climate room after the Electric Area seed is planted.
The grown plant should supply power and open the connected doors.
Travel through the climate room toward the western greenhouse.

Pot D doesn't require an additional light source. Once both climate room doors open, the players can reach the western time glass and prepare the next plant.

Part 2: Power the Ultimate Seed Container

The Ultimate seed is secured inside a container in the present. To release it, you'll need an Electric Hook plant and the Hook Gun's electrical connection.

Both players should use the western time glass. This places the Goop Gun player in Rockbury and returns the Hook Gun player to the present.

Goop Gun Player

Take an Electric Hook seed from its dispenser.
Apply Blue + Purple fertilizer at the mixing station.
Plant it in pot E near the western time glass.
Activate the light pressure plate connected to pot E.
Keep the plate activated until your partner finishes using the plant.

Hook Gun Player

Watch for the Electric Hook plant to grow in pot E.
Find its electrical connection points and the energy node above the Ultimate seed container.
Use the Hook Gun's two connections to establish a link between the plant and the node.
Once the container opens, collect the Ultimate seed.

The light pressure plate is essential here. If the Goop Gun player steps away without leaving a Goop block to hold it down, the plant may no longer provide the height and electrical connection needed.

What if You Can't Reach the Energy Node?

The energy node above the container is positioned high enough that connecting it from the floor can be difficult. If the Hook Gun can't reach the required points, use the Ladder plant as an alternative way to reach the upper section.

Have the player in Rockbury prepare a Ladder seed using Green + Orange fertilizer and grow it in pot E with the light plate active. The Ladder plant creates climbable growth that can help the present player reach the higher area.

Once the present player has reached a usable upper position, the player in the past can replace the Ladder plant with the Blue + Purple Electric Hook plant. The electrical plant is still necessary to power the container.

Be careful not to use the Blue + Green combination by mistake. That produces a different ladder-like plant which doesn't provide the same climbing function.

Use this as a backup approach if the ordinary Hook Gun connection isn't reachable from your current position.

How to Grow and Collect the Battery Bulb

With the Ultimate seed collected, the remaining objective is to grow it in the only watered pot in the greenhouse.

Both players must return to the western time glass and exchange positions again. The Hook Gun player carries the Ultimate seed into Rockbury.

Battery Bulb Solution:

As the Hook Gun player in Rockbury, take the Ultimate seed to the fertilizer mixing station.
Apply Blue + Red fertilizer.
Find pot C, the large watered planter in the main hall.
Plant the prepared Ultimate seed in pot C.
Have your partner confirm that the large plant grows in the present.
Before collecting a Battery Bulb, both players should exchange time periods once more at the western time glass.
The Hook Gun player, now back in the present, can return to pot C and collect a Battery Bulb.

Don't collect a bulb before completing that final time exchange. Picking one up removes access to the time glasses, so leaving the players in the wrong periods can interfere with their intended positions for the next section.

When fully grown, the Ultimate plant produces Battery Bulbs around pot C. Some are on the plant itself, while others can be found on the floor nearby.

Collecting a bulb opens the exit in Rockbury and allows both players to continue. Growing the Battery Bulb also completes the requirement for the All Grown Up achievement.

We Were Here Tomorrow Plant Puzzle Not Working

If the plant puzzle won't progress, check the plant's appearance in the present before preparing another seed. Its growth can help identify which part of the setup is incorrect.

Problem	What to Check
Plant appears small or unhealthy	Check the seed type and both fertilizer colors.
Plant only grows halfway	Check whether it needs water or an active light plate.
Electric Hook stops working	Keep the light plate for pot E activated.
Ultimate plant won't grow	Use Blue + Red and pot C. It requires water.
Can't reach the seed container's node	Try the Green + Orange Ladder plant to reach a higher position.
Wrong plant appears after mixing	Check that you selected the intended seed from the dispenser, not just the correct fertilizers.

How the Greenhouse Light Plates Work

The light plates are controlled in Rockbury and change the growing conditions of their corresponding pots. A player can stand on a plate or use a Goop block to keep it activated.

Plants that require light need the correct amount of illumination. Activating additional plates unnecessarily can cause problems, especially around pots B and C, where lighting controls overlap.

For the main solution, the important light control is the plate connected to pot E. Keep it active while using the Electric Hook plant, then release it once the seed container has been opened.

How to Fix the Plant Puzzle Softlock

Jumping onto certain plants can cause your character to become stuck in their collision. If that happens, wait briefly for the game to respawn you. If it doesn't, reload the latest checkpoint.

To reload, return to the main menu, select Change under Your Journey, choose Start New Journey, and have the host select your most recent checkpoint.

It's also worth installing Patch 1.1.2 or later. That update addressed a problem where placing the wrong plant with the correct fertilizer colors in the final pot could break puzzle progression.

The greenhouse solution ultimately comes down to giving each plant the environment it needs. Orange + Purple in pot D opens the climate room, Blue + Purple in lit pot E powers the special seed container, and Blue + Red in watered pot C produces the Battery Bulb. Complete the final time exchange before collecting the bulb, and both players can move on to the next part of the Temporal Research Centre.

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