How can I protect little trees from deer? First, let me voice I live in the heart of suburbia, so...

First, let me voice I live in the heart of suburbia, so shooting them is not an pick. Apart from that, I'm trying to figure out if I should put up somewhat fence around, or if deer repellent in actual fact works... Any ideas are much appreciated, especially if it's something you've truly tried that worked. Thanks!
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Answers:    OK.....I have used this formula for fifteen years and it Always works.
Go to the souk and buy 2-4lbs of jalapeno peppers. Put them within a blender with a quart of hose down. Run the blender for ten-fifteen minutes. After a nice solution is made strain the water thru a coffee filter and collect the solution. Put the liquid within a good spray bottle and every other morning spray the affected areas of the plaints next to the Pepper Juice. It will not poison anything but, it will not be something the Deer will want to eat....more than once
I hold a BROWN thumb: How do...
Try making a scarecrow or a dummy near some old clothes.
Make sure it is facing the other approach so the face is not see. Position it like it is kneel on the ground like a existing person.