does anyone know how was the mandela's gold strelitzia was made was it alba augusta and reginae or something else

Could you rephrase the question please.

does anyone know how was the mandel's gold strelitzia was formed produced. is it a hybrid crossed with strelitzia reginae and alba augusta ?

Twenty years of breeding from yellow forms until a stable yellow form (i.e. one that reliably produced the yellow flower) was produced. It was called 'Kirstenbosch Gold' until 1996 when it was re-named in honour of Nelson Mandela. All this I looked up on the internet for you

thanks for your research means a lot

? are yellow forms man made or not