I used to have Strelitzia
plants in my Cape Town garden when I lived there, and I did nothing special to them, they just bloomed in
spring every year. Now in Spain I have two large
plants in a big pot, they like to be pot bound I believe. I had 3 blooms this year in
spring, I feed every week with general fertilizer,in summer and water every other day as it is very hot and dry now. So far so good.
My sister grew 3
plants from
seed in UK, indoors, and they bloomed after 10 years!!!! Good luck with yours the blooms are worth the wait.