it's your own fault for leaving the garage unlocked. NEVER EVER EVER leave any door unlocked.
that gives cops the ability to open it and look inside. they don't have to step inside, they can just look. they'll say the door was open.
you don't need an alarm, just a motion detector, or motion activated light. they're cheap, and will beep or turn on whenever somebody's fucking around with your plants, or hanging around too close to your house.
if you hear that go off, you know to check...
also, if you can, get a dog.... training a dog to not bark and protect isn't easy, but it's possible and very effective.
LOOK:
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and do not set up booby traps. if you rent, and you're landlord wants to make an inspection, you could end up in a real problem.
also, if you catch the thieves should they come back, don't lock them in your house and kick their asses. that's false imprisonment, and you could set-off a i got you last chain-reaction that won't help you out at all.
and move your plants. if the dumbasses get caught with the weed, they'll have no problem pointing the finger to your house to get off easy.
lock the damn gate next time!!!!