Paper whites are only for indoors, but do you know what they smell like😱
I bought them only once for my daughter my mum and myself, we all had to put them outside when they flowered. Or is that just my family😀
i think indoor bulbs have to be kept in the cold and dark for a while even if they are ‘prepared’, before being brought into the light, I don’t think you just plant them on a window sill in the first place.
Or have they gone off that Idea now, methods do change.
Some white pelagoniums would be good in the troughs, they will flower all year. Bulbs flower for just a couple of weeks indoors. You could put three or four in each trough.