The size of the flowers etc. is affected by the growing conditions. If one feeds G. nivalis then you do get a longer stem and a fatter flower. The provenance of the bulb has little to do with its ultimate girth. There are varieties of G. nivalis (the soi-dit 'native' Snowdrop) which are genetically programmed to produced bigger flowers. Some of the species also are bigger than nivalis and there are also giants amongst these too. There are also the opposite, much smaller forms as well.
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The size of the flowers etc. is affected by the growing conditions. If one feeds G. nivalis then you do get a longer stem and a fatter flower. The provenance of the bulb has little to do with its ultimate girth. There are varieties of G. nivalis (the soi-dit 'native' Snowdrop) which are genetically programmed to produced bigger flowers. Some of the species also are bigger than nivalis and there are also giants amongst these too. There are also the opposite, much smaller forms as well.