Shrimp Plant Leaves Turning Black At Very Edge Of Leaves

Question

It’s planted in a pot about 5 years old or older.

Answer 1

They turn black with age and forming seed. You can let the seed mature and collect it, or prune off the darkening bracts to create a bushier plant.

https://www.gardeningknowhow.com/ornamental/shrubs/shrimp-plant/growing-shrimp-plants.htm