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RE: Brisbane summer flowers.
Most mesembs are only open at certain times of day. Some in the morning, others the afternoon and still others at night. A small minority are always open. I dont know which category pig faces fall into
We have pigfaces near us and my mother in law has them...I see them open and close at times so that's where I get my information from...Not from any understanding of botany...I've been less to believe it's sun-related though. They are a vibrant colour though huh? I guess they adapt as they need, like anything in nature.