California Nursery Company - 1884? or 1865?

Plastered all over the office building is
"California Nursery Co."
"Established 1865"
1919 Catalog

So many secondary references say that the California Nursery Company was established in 1865. Yet there are no primary references that agree with this date. 

Apparently there are papers for the incorporation of the California Nursery Company in 1884. Along with that goes stockholders? a board? etc.

But that is not the question. The question is when was the California Nursery Company established, perhaps as a private nursery. 

Try as I might, I cannot verify that there ever was a California Nursery Company that was established in 1865, even a company that was owned by someone else than John Rock.

Here's the sticky point. What is the 100th anniversary of the California Nursery Company? It was celebrated in 1965.