Thanks for your comments, very kind. I live, what is called, in the "country side" so we have canals around the garden and the neighbours are farmers with cattle and I water all the plants, including the clivia's, with water from the canal. I hardly give manure to my plants because of that but most monocotyledons I give 7-14-28, the clivia's too. I put the plants outside in the shade in June and leave them there till October. When I bring the plants in the unheated greenhouse I repot and when temperatures go further down I move them again to the heated greenhouse. And in March they go back to the unheated greenhouse, so that is about the year cycle of the clivia's.
Today, Tuesday now, the plant is even more orange then last weekend as the flowers on the secondaire stalks are open too.
Best wishes from Holland,
Wim