Fl. forming a double triangle, 98mm wide, facing upwards; perianth segments 39mm long, broadly ovate, blunt, mucronate, brilliant yellow 7A, spreading, plane or a little concave, with midrib showing, of heavy substance, overlapping half; the inner segments a little narrower, shouldered at base; corona 19mm long, cup-shaped, angled, orange-red (28A), mouth straight, broadly ribbed, wavy and shallowly lobed, with rim notched.

Named in honour of the RHS Bulb Committee visit to Belfast in 2019 and presented to the RHS President at Belfast Castle.

There are no photos of "Belfast Castle" in Daffseek.