STAR WARS Jedi: Fallen Order
39 Achievements
1000 XP
25-30h
Green Thumb
Have a fully grown terrarium
25 XP
3.0%
How to unlock the Green Thumb achievement in STAR WARS Jedi: Fallen Order - Definitive Guide
Edit 2: As more people have unlocked the achievement (on Xbox and other platforms), it's been clear that the only requirement to make the seeds grow is time, either leaving the game running without doing anything or just traveling through the different planets, killing enemies and/or trying to unlock other achievements.
For the people who are still doing the main missions, here's the time stamp from the "Ideal" order to gather all the seeds:
Bogano
0:27 Kalpi
1:07 Featherfern
Zeffo
1:28 Royal Fluzz
2:44 Gillypod
3:44 Dreamwort
Kashyyyk
4:56 Bonshyyyk
6:09 Milk Grass
6:52 Mushbloom
Dathomir
7:32 Bleeding Cut
8:00 Mushling
For those who already completed the missions, the order to gather the seeds is not important, but the timestamps can help you identify which plants are missing on your terrarium (that's the actual order they're planted in the game, even if you missed some of them in your first run).
Edit 3: As of 12/17/2019, the people at Respawn released a patch to fix problems with the growth of the plants, so for everyone who have played the game before the patch can try again if you find problems making them grow. They didn't specified anything related to time spent to make them grow, but some people got the plants progress bugged, so maybe this fixed that problem. Ref: https://www.reddit.com/r/FallenOrder/comments/ebx78u/star_wa...
EDIT: neither meditating or traveling seems to help, I think you need to get a certain distance from your ship and return...
All seeds, all locations.
Saving and reloading the game will always make the plants grow one stage, but there's a correct way for doing it.
First, you cannot use the saving spot inside the ship, so look for a world who has a saving spot close to the landing ground (I think Bogano is the best option).
Just go for the saving spot outside the ship, get to your knees and save the game.
Quit to the title screen and reload/continue (no need to end task or reboot).
Once you're back to the game, go back to the ship and actively check your terrarium.
You'll notice the last seed (or seeds) you planted grew one stage.
There are just three stages from planting and growing the seeds, so after you find it with BD, actively check the terrarium to plant the seed and do the save and reload process just two times.
I had only one seed left to complete my set, and this was my last achievement in the game, so I had no intention to just wonder around waiting for this.
Credit to Aboelsas Show for the video.
For this achievement, you will need to collect all 10 Terrarium Seed collectibles (see "Collector" for more info on their locations), and plant them in the Mantis. There is a long glass case that you can interact with on the ship, and any time you return after having obtained one of the seeds, a new hole will form in the terrarium. These plants grow in real-time, so it's a good idea to focus on these collectibles during the story even if you plan to get most things after the story is done. Once all ten seeds are planted, keep playing and finish the story and get all the collectibles, then inspect the terrarium again. If all the plants have fully matured, the achievement will unlock. If not, you can leave your game running and check back from time to time until it does.
100% working option - We fly to Illum (snow planet), run to the tower at the very beginning and climb the wall to the very top (there is also a chest and a pyramid with Echo). We leave Cal near this pyramid to admire the horizon and go away for a couple of hours to drink tea.
Apparently the ship's AFK does not trigger plant growth, since the ship is not unloaded from the game's memory. In the case of the tower on Illum, we are close, there are enemies hanging out under us (maybe it also has an effect) and the ship is unloaded from the system memory. 7 hours at the ship yielded absolutely nothing. 2 hours on the tower gave me a trophy.
-Planted a flower
-Flew to Illum
-Runned into the temple
-I crushed enemies there in one or two rooms
-Sat down on a meditation circle
-Returned to the ship: the flower has grown to the second stage (low blades of grass)
-Flew to Zeffo
-Repeated the operations - killed a couple of enemies, meditated
-Returned to the ship: the flower grew to the end, the trophy was counted.
The whole thing took about 15-20 minutes.