Digging the tuberose bulbs works best for me because if I leave them in ground they will multiply like rabbits and overcrowd themselves with lots of green foliage and for the next summers, i.e. their blooming season, they send few and sometime NO flowering stalks at all... they are extremely drought tolerant... some years back I had them in larger pots, when we shifted to our new place I left the pots behind and after four months of hot dry summer and complete neglect, the time we sold the apartment , they were nearly all green....!!
In my experience, nearly all bulbous plants need some rest and dormancy period to bloom well....
BTW the banner looks great..!!