Widely available here. May be considered heirloom hippeastrums, already naturalised by the road side in in almost every body's garden in Malaysia.
I got mine given by my neighbour when he did his garden makeover in Jan 2008. I planted them en masse in my garden bed. It does not require any cooling period to bloom, may be just a semi dormant state. It can be forced to flower by cutting all of its foliage at the neck level, the the blooms will be forthcoming in about 2 months time.
Mine that are planted in the garden bed, in its second season of blooming, has been producing blooms since Feb 09 till now. I let them to bloom naturally without forcing.
Th blooms are salmon-orange-pink, with green throat, measuring 3.5 inches on an 18 inches scape.
With the red Puniceum
With Night Star
With Blossom Peacock
With Andrea Maguire
With Zephyranthes Citrina, rain lily