Hi.

I noticed that my prized periwinkle plant is getting black patches at the base. NOT good, most likely stem rot.

Now I must hunt for the source of it. I suspect it's from my compost.

I also need to know how to check the nutrient composition of the compost so I can decide what to put and what to ommit.

It's a cold compost in a flower box (the only thing that can fit on my balcony, very narrow ) I always have to dig a central hole for aeration, although sometimes the kitchen scraps fill it up to the point a mount must be made.


No meat were used.
Eggshells are used
Primary carbon filler are corn cob pallets from my hamster's bedding (given organic food and things like that)

I suspect that it's too high in nitrogen and phosperous