how to grow Green birdflower Crotalaria cunninghamii
The plant originates in Australia and prefers moist, sandy-loamy soil in a full sun site. Here is more information:
A few of my peace lilly house plants are developing brown tips and also a sticky substance on a few of the leaves.
It sounds like and insect or pest infestation, such as slugs or snails. Unfortunately, your photos did not come through. I am unable to see the damage.
In the meantime, these articles will help:
https://www.gardeningknowhow.com/houseplants/peace-lily
https://www.gardeningknowhow.com/plant-problems/pests/pesticides