I hilled up several potato plants with not mature
compost , still in very rough form. -- basically leaves and
clippings clomped together.

The plants began to die back, and didn't produce a lot of (red)
potatoes.

Did I do wrong by using that material to hill up?

IOW, is this post hoc, ergo propter hoc?

Or just coincidence.

TIA

--

Persephone