This summer I grew Browallia for the first time in Zone 4, MN. I was curious about wintering the plants in my house till next spring and then possibly trying to grow them again. Is this possible? Would I just let them go dormant or would I need to water them? I was thinking of wintering them either in my basement or garage (which is not heated). Your thoughts? By the way, I grew them in full sun and they bloomed ALL summer. Your blogs mention it is a shade annual.