Wheat grass, bird seed sprouts, and catnip are also good alternatives. You can make your kitty her own private garden by growing any of these plants, or a combination of them, in a window box or large pot away from your other plants. Hopefully, these greens will be so tempting that she'll have no desire to go after your other, more decorative plants. If she still needs a little extra nudge to keep her away from the philodendron, you can dab the leaves with something that has a bitter taste, such as white vinegar or one of the animal deterrent sprays available from some pet stores and plant nurseries. You may want to do some research first, however.
Some sprays can be harmful to some plants.
Finally, don't dismiss the power of keeping kitty distracted. You'll do your plants a great service by making sure your cat has plenty of toy mice, plastic balls, bells, and scratching posts to keep her busy. When you see her going for a plant, try waving a chase toy at her or rolling a ball in her direction. Most likely, she'll see it as a much more fun alternative.