parrot plant

sorry to keep bugging ya but does anyone know anything about Strelizia bird of paradise plants? ive got 2 growing as house plants and one is fine  but small but the other has 3 leaves that have gone brown and crispy round the edges, should i prune them back or leave them and see what happens?i dont pick easy projects!!

oh thanks. tried growing from seed and had pots of mud for months,how did you do it cos ive got some seeds left??