Hardiness of Zephyranthes foliage
Alberto Castillo (Tue, 15 Oct 2013 03:53:06 PDT)

I grow Flavissima in zone 10, in Australia, in a hot dry sun scorched bed
in poor soil, very low in organics " rare for me " mine flower regularly &
have set viable seed which has produced the same flower... A worthy little
Zeph if you can get it right, the colour in the sun is so florescent &
sparkles beautifully as they dance on the breeze.....

No doubt this is the same thing and no doubt it is heat the key to success.