Passion fruit stem bark stripped at base What can be done??

Thank you for contacting Yates. 

If the damage is caused by rodents. Try setting up outdoor bait station to control rodents in garden, the product you can use is Ratsak reusable bait station, please read more about his product from the following link:  https://www.ratsak.com.au/ratsak-reusable-rodent-bait-station

Unfortunately, with the plant, there is not much we can do but helping with some liquid fertiliser. Try 'Yates Dynamic Lifter Liquid Concentrate' as a gentle fertiliser and soil improver. It's certified for use in organic gardens, and contains seaweed, blood&bone and fish meal to help developing new roots and restoring healthy growth. Click here for more info on this product: https://www.yates.com.au/product/garden-fertilisers/certified-organics/yates-dynamic-lifter-liquid