Fencing to keep chickens out of herbs

Hello all. I have a medicinal herb garden. It's about 40x3 feet right now but I plan on expanding it wider this year. I prefer to use wood mulch around my plants. Chickens like to hop my short fence (I currently only have a decorative knee high decorative fence around it) and kick the mulch everywhere. While that's great for getting rid of pests they are really causing alot of damage. Anyway to deter them. I'm terrible at building but open to any ideas you all may use. I attempted to attach a picture which isn't great because its winter...the herb garden runs right beside the length of my hoophouse...you can really see the fence...but all the stuff that looks like weeds are my herbs.

Electric netting. Besides the netting you'll need a charger and a way to ground it, but it's easy to set up, take down, and move.

Love those chickens, but you are so right about how destructive they can be.

Can you just make the decorative fence a bit higher?  I wanted to protect an area right in front of my coop so I used 2' high rabbit fencing.  About once every three weeks a bird would get in there and not be able to get out.  I'm guessing if it was 3' high they wouldn't've gone in.

On second inspection, that decorative fence looks like it's pretty short, maybe 10"?  I'd definitely just get some wire fencing from the store (2-3' high) and some metal or rot resistant wood stakes and just fence it off.  That should dramatically reduce their incursions.