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Happy_1, from my experience. These plants prefer shady area and they appeared to tolerate high humidity. Yours look as if they bloom were spent, just a normal progression. I love their exotic blooms. They need winter protection here in my zone. Are yours planted in the garden? How long have you had them?
Hap. I saw a fellow DG who raises gorgeous 'Lobster Claws' in Australia, I hope he would stop by and share his knowledge with us. Like I've mentioned, I love these plant. But I really don't know much about their culture. Perhaps, you can post your question on the Australia Gardening Forum?
This is where DG is wonderful, we're able to share/exchange ideas with gardeners all over the world! I love it.
A lack of moisture can shorten their flowering time. In hot areas they do need some shade. If it is hot and dry outside they will need to be watered regularly.
Thanks for answering. Don't tell anyone but my sprinkler system is set to go off every other day. What puzzles me is that they have been fine for 3 years. It could be that they have done this before this time of year and it was not noticed. They are in our full sun, but none of the leaves show any signs of stress.