It seems you might be asking about a Plum Granite plant, but that's not a common name for any specific plant. It's possible you're thinking of a few things:

* A rock type: "Plum Granite" could be a descriptive term for a type of granite with a purplish or reddish hue, often used for decorative purposes.

* A hybrid plant: There are numerous hybrid plants, often developed by breeders and sometimes given names that combine the characteristics of their parents. Without more information, it's impossible to know if "Plum Granite" is the name of a specific hybrid.

To help me understand your question better, please provide some more information:

* Where did you see this term used? (e.g., a nursery, a website, a book)

* What kind of plant are you looking for? (e.g., a shrub, a flower, a tree)

* Can you provide any other details about the plant's appearance? (e.g., the size, shape, or color of the leaves, flowers, or fruit)

With more context, I can better assist you in identifying what you're looking for.