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I find the bigger, older tubers of C. hederifolium do make roots all over rather than just on top so I suppose if the tuber were sat on top as in the plink images, only where it was covered and received moisture, would it make roots.
My hederifolium are starting to flower - this one was looking particularly nice this morning.
I would agree with you John your Hederifolium is stunning, I do love white flowers.
Cyclamen mirabile are starting to flower. Three different shades.