Zantedeschia aethiopica 'Hercules'
The big one, this form of Zantedeschia is not normal, it can reach 6ft tall with getting close to 1m long flower spikes! it likes full to half sun with a moist but well draining soil, its hardy down to 0C most likely more but untested.
You may also like
An easy to grow succulent plant native to Mexico that likes full sun with well draining soils. Hardy down to 0C in winter bring into a cold glasshouse for winter.