Serissa will do much better in the ground,
I have a potential forest growing in the ground for the last four years
(Zone
6/7).
Gary Woods wrote:
This spring I set a bunch of Serissa cuttings, the results of trimming a
very overgrown small tree, destined with expert help, to be shaped "broom"
fashion, in a nursery bed in the garden.
Zone 5/6 in upstate New York,

Carl Rosner is in coastal South New Jersey.
I very much doubt that Serissa will survive outdoors in the Albany, NY area.
Has anyone tried it? For Gary, I would recommend potting the Serissas in large
plastic bulb pans, and grow them for several years in an enclosed fluorescent
light garden with controlled humidity. Serissas like cool temperatures and
humidity over 60%. Of course they go outdoors for the summer.

Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)