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It grows in my garden. We bought it as a plant several years back, and it has grown to a 2 metre high shrub, with several flowers each year. The Proteas are South African species, some 20 or so I believe and all are pretty spctacular in flower. They are commonly grown for the cut-flower trade and I believe the flower-heads last a long time as cut-flowers.
I can't answer that! It is a feature of many of the Australian Proteaceae, especially the Banksias that they need a fire before the seed is released. It seems quite possible that the same applies to the Proteas and other South African Proteaceae. I have not attempted to locate seed on my plant. I shall have to wait until this years flowers are over and see if I can locate any seed. We usually cut off the dead flower-heads each year as they turn black and stay on the plant a long time. It will be in flower in about a month's time.