I've had a it happen on one of my complex hybrids that usually only produces one. I think, like has been said above, that when it's particularly happy it can happen if there is any genetic influence from the parents to have more than one flower.
When it happened for me I noticed that the second bud formed upside down with it's base pressed upwards towards the base of the first bud. It formed later than the first, and was very small while the first opened, then developed to full size once the first was open.
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Hybrid Mode
