Blossoms On My Night Blooming Cereus Don’t Open All The Way. Tips Are Fused.

Question

I can usually pry them apart gently with a toothpick but what is causing this? Plant is maybe 18 years old. Started doing this with just a few 2 years ago, no happens to most of the blooms.

• 

Answer 1

It could be that soil nutrition has been depleted too far, or that there is too much nitrogen, and not enough phosphorus and potassium in the soil. These articles will help:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

https://www.gardeningknowhow.com/ornamental/cacti-succulents/night-blooming-cereus