Fifteen years ago I planted Grevillea 'Winpara Gem' in my garden. This grevillea is a hybrid, a cross between G. olivacea and G. thelemanniana. It has flowered prolifically every year and has never set seed. I thought that was because it's a hybrid. So why has it set seed this year? The bush is covered in fruit, beautiful little shapes with long tails. I wonder if the seed will be viable and if so which parent will it follow?