After solving the valve puzzle in the previous section, Lara enters this new area. A short cutscene draws your attention to a dead guard with a keycard on one of the higher walkways.
There's a very alive guard (13) on patrol off to the right. Kill him with weapons or stealth. If you choose stealth, run to the wall on the right and hide near the 3 giant pitcher plants.
Activate Stealth. Then, when the guard passes, moving to the left, follow him and knock him out.
Take his BOTANICAL LOW ACCESS PASS (16).
The exit from this area is in the far right corner of the room, relative to the entrance. This short hallway has 3 card readers. You'll need three botanical access cards to get out. You've already got one.
As you explore, watch out for the plants. The ones that can move will attack and poison Lara if she gets too close.
They are pretty, though. I'll give Muller credit where credit's due.
Go to the raised plant bed in the middle of the room and climb the ladder to the walkway above.
Now you're on LEVEL 2. Head forward then left. Climb two two flights of stairs to LEVEL 4.
Here you'll find a blue door, which only opens from the other side, 2 more guards (14-15) off in the distance (ignore them for now), and a series of small ledges arranged so you can jump across the slippery glass roof of the smaller greenhouse. Take a short hop (Walk + Jump) from the first ledge to the second. Then a regular standing jump from the middle of the second ledge down to the third.
At this point, you may get a clear shot at the guard (14) on the upper walkway. Kill him if you like or wait until you get closer.
NOTE: If you don't care about 100% completion, you can skip the next pickup and continue across the roof. (See below.)
If you want all pickups, you'll need to take a slight detour here. Turn to face up the sloped roof and step off the edge of the block. Slide back...
...and grab the edge of the roof. Traverse to the left a little if necessary and drop onto the narrow ledge above the green pool.
Walk to the corner and pick up the bandages (17).
Jump into the pool, swim to the steps, and climb out. Then retrace your steps up the ladder and stairs to the greenhouse roof.
This time, take a short hop from the first ledge to the second, a standing jump from the middle of the second block to the third, and another standing jump from the third to the fourth.
Walk to the outer corner of the fourth block and take a standing jump to grab the edge of the walkway ahead.
Pull up and shoot that guard (14) if you didn't do so earlier.
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