Hanging basket plant (7)
(Other definitions for nasturtium that I've seen before include "flowering plant" , "Garden climber" , "bloomer" , "Common trailing plant" , "ITMA's U-turn (anag) - flower" .)
(Other definitions for begonia that I've seen before include "bloomer" , "Tropical plant" , "Herbaceous plant whose flowers have no petals" , "Common garden plant" , "colourful flower" .)