I planted some hippeastrum 'Papilio' seeds last year in October. 4 of 5 of them germinated. 2 of these 4 were white and died eventually. Now these last two are 3.9 inches and I need advice to how to keep them happy and growing. I have them in a cool room with lots of light at the moment, but I am not sure if this is the best place to keep them? Perhaps they like it a little warmer when in growth?