Hey guys, I'm kinda stuck...
Traps for my garden.. It says I can give life to rocks which make for nice traps against brothers trying to invade my garden - but it doesn't say how. I've tried using all the glyphs I have on rocks and nothing seems to animate them... Can anyone tell me how this is actually done?

I had some trouble with that too. I don't think there's any traps to set in the first garden (at least I didn't see any). You'll know when you see one because it displays an icon that says how much nerva you must spend on it to activate (something like 0/70).

There is a large rock trap in the first garden near the entrance. Approach it and aim the hanging roots, you are sure to see an icon. Then put in you limfa with strokes (you may use different colours). On a second thought, if you do nothing with your garden, there might be no reason to defend it.

there is a trap in the first garden.

When you enter the chamber there is a big mountain/slope near you. From it you a sort of tendrils coming out of it. That is where you activate the trap.

Hehehe, I never noticed that trap either, though I have seen traps in most (not all) of the other gardens.

Also, I'd say that you don't always need to use traps for defense... depending on how many Brothers are about, and how careful/confident you are with your own movements.

Quick question: do gardens eventually stop producing color? I think my first one stopped (I'm on the 10th cycle)

Once a tree is filled it gives color for about 3 cycles. After that you need to wait a few more cycles for it to become available again.