Plants in my garden

This only blooms once in its life time and belongs to the cacti family. The beauty of this plant is that it always bloom during the CNY and the flower last for months.
My 'tanduk rusa' ..literally translate as deer horns.....the one and only one...wondered why its 'horns' never grows any longer....
Thot these was hard to care for..............still is
Water plants...water lettuce