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04 November 2020 01:45 PM
Snails and/or caterpillars are the most likely culprits, so sprinkle some snail pellets around the base of the clump, and spray foliage with Mavrik:
https://www.yates.com.au/product/garden-pest-control/yates-mavrik-chewing-sucking-insect-killer/
https://www.yates.com.au/product/garden-pest-control/yates-blitzem-snail-slug-pellets/