A suggestion for very effective, very inexpensive deer fencing.
Judge a height that your local deer cannot jump over. Our local deer can jump a 1.5 meter fence easily, but won't attempt 2 meters or more. I use poles which stick out of the ground about 2 meters, solidly advanced into the ground. The poles do NOT need to be close together.
Get some 30-pound test monofilament fishing line. String that line tightly between the poles, 0.3 meters above the ground, all the way around the plot. Don't forget to loop around each pole, and leave yourself a gate to go through. Go up another 0.3 meters higher on the pole, do the same thing. Keep going until you are at the top of your poles with that monofilament line.
Deer only jump an obstacle they can see. They can't see that fishing line, so they try to walk through, but the line (30 pound test) is tough enough they can't do that either. Confused, they walk away, and don't jump.
I did this last year, it worked like a charm, they never got around it. The only plants that got nibbled were those too close to the fence. My fence last year cost about £7, that cheap because I cut all the bamboo poles I need from my own property. Yours might cost just a bit more. I will keep using the same fence this year since it is still in good shape except for one small place needing a minor repair.
Try it!!