The only other way I've kept cats out of soil is to insert plastic forks into the soil with the tines up, but I'd say that's a lot less helpful than wire or netting! Plus some cats will just pull the forks out of the soil and dig anyway haha

Another theory is that cats may eat grass for some trace minerals and the vitamins A and D. Grass also contains chlorophyll, which, before the discovery of antibiotics, was a remedy for pain, infection, ulcers, skin diseases and anemia. Grass also contains folic acid, which helps with the production of hemoglobin, the protein that moves oxygen into the blood to help kitty’s circulation. Plus, there’s the benefit of breath cleansing chlorophyll. What is Cat Grass? The Window Garden is an indoor cat grass garden that attaches right to any window with suction cups! Your indoor cat will love hunting down bugs from the comfort of your home. Also, the suction cup installation makes it easy to clean without taking up space.This grass planting tray is a large one which means that you can use it on the floor or a chair – the grass planting trays are available in two different sizes, a big one and a medium one. In addition, this grass planter comes with grass seeds which you can plant in the tray to grow grass for your pets outside or inside of your house. Kitty Grass is produced using 100% recyclable paper so that you can have a decent outlook on your buy. There isn't one clear explanation for why our furry friends love to munch down grass by the mouthful, but a few theories amongst experts are:

Research has not yet shown why cats eat grass, but we have several ideas,” said Carlo Siracusa, animal behaviorist of University of Pennsylvania School of Veterinary Medicine. “In the wild, cats eat grass after they have eaten their prey. In many cases, the grass causes the cat to vomit. We believe this is nature’s way of helping the cat expel the parts of their prey that are indigestible.” The new and improved Grass Planter features a deeper bowl that is capable of holding the perfect amount of vermiculite. It also features added drainage holes to help prevent overwatering.

If you’re growing it yourself try planting a handful of seeds at a time. If you have more than one cat, perhaps give them each their own pot. Cats often overeat when they’re ill so make sure to monitor them to make sure if they’re eating excessively that they’re not vomiting too often and that they’re not ill. When your grass is 4-6 inches, feel free to let them have a go at it! It normally takes about a week to get to this size. For this part it’s easiest to use a spray bottle to avoid over wetting the soil. How long will the cat grass last before it dies?