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
in UK, indoors, and they bloomed after 10 years!!!! Good luck with yours the blooms are worth the wait.