Tim Tompkins wrote:

If you dig them up each year they will remain small plants and not have a
change to develop beyond a 'first year'
plant.

Following up on this, how often do you think the potted plants should be
repotted or potted up? I've got them in the big resin pots from Sam's
Club (14 and 18 inches I think) but at some point I will need something
bigger like a half barrel. What are the signs a rose needs a bigger pot?

Thanks! Kim