does anyone know what this plant is?

does anyone know what this plant is?

Observation - does anyone know what this plant is?. Description: Def not a fox-tail lily (erymurus). Not hardy, have tried. Flower stem can grow up to 4 foot high; flowers May; fleshy white roots, bulbils root and grow alongside parent. Only ever seen one elsewhere - conservatory at Hergest Gardens ( Bank's family)King

Def not a fox-tail lily (erymurus). Not hardy, have tried. Flower stem can grow up to 4 foot high; flowers May; fleshy white roots, bulbils root and grow alongside parent. Only ever seen one elsewhere - conservatory at Hergest Gardens ( Bank's family)Kington. Their gardener can't identify it either. I have propogated these since 1987.