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They are around 30-33 cm. I think that this species like N. broussonetii needs many hours of full sun. I think it is possible to grow it in Mediterranean countries.
fantastic comparative picture Gerd.In Jandula river, there are N. cantabricus, but I think N. albicans is still an hybrid. Seeing the amount of N. cantabricus and N. bulbocodium, there are very few N. albicans types. I collected once this plant and it was sterile. Maybe this evolution has started recently in this particular place and this is why there are very few. In Toledo or Extremadura, N. albicans have thousands of plants, more than the parents.Gerd, did you see the groups of N. jonquilla mixed with N. cantabricus and N. bulbocodium? they don't make any hybrid there are also few N. triandrus subsp. pallidulus in the same group, close to the water and also N. jonquilla is not accting without any other species.