I have grown snaps in pots dwarfs and tall. They like shady spots indirect light. Need deadheading to encourage flowering. In hot temps they stop blooming and in fall will set buds again to flower.
Some hybrids are notoriously fussy bloomers. I start old true seed from origional stock that have been treated with green powder to inhibit wilt disease. Some are known for their tough stocks and blooms from seed catalogues best grown from true proven winners in early spring set out in semi shade areas in pots in the garden in May ,June in my zone.
