Hi, of your growing indoors just close the space off so the cat can't get in!! If outdoors you can look at a screen (a couple of bamboo stakes with a fine transparent mesh) lemon is good for controlling cats anything citrus really they hate it also helps with over pests, cut a lemon in half and rub it around the rim of the pot, whatever is left squeeze into a little bowl and place at the side of the plant, or get a dog!!!! Hope this helps 👍