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Originally Posted by jollyburger
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I believe you're conflating the "seeds", with the "pollen", with the flowers themselves.
The actual flowers (which house the pollen and produce nectar) have no nectar, which is necessary to attract insects like bees and small birds to the flowers to drink said nectar as food, and while doing so get some pollen stuck onto themselves.
The insects or birds (or in some cases small animals even) then act as pollen vectors, in helping transfer pollen from flower to flower thus pollinating them to germinate into fruits with seeds.
And then the seeds themselves are propagated either by animals or insects - in case they grow in edible fruits that can be eaten by said creatures - and then spread around after going through their digestive tracts as ejected fecal matter (complete with ready-made "seed food" in the manure around them), or in the case of plants to don't develop fruits, the seeds develop as light objects with wispy "fruits" or seed pods - sometimes with "wing" or "sail" like extrusions to facilitate them being spread by wind or runoff rainwater.
Seeds typically don't have nectar. It's the flower that does.
The seeds are either edible on their own are are in a casing that's edible and delicious (the fruit) to animals and insects)
In the case of the daffodil, the seed pod is neither nutritious or attractive to insects or animals, and the seeds themselves are too heavy to be blown away from the parent plant by wind or rain water.
Hence they need human intervention to help them propagate far beyond where they are "born".
So the lack of nectar is only a first part of the problem they face in being able to spread and propagate themselves along with the fact that they also don't develop or grow fruits or seed pods that would be attractive enough for animals to help them spread while not being mobile in shape and form themselves for the elements to do so.
In essence they are badly evolved plants that probably only still exist because we humans have helped them continue doing so, and would long ago have gone extinct without us due to their terrible natural adaptations.
Much like some domesticated animals (and plants) which can no longer survive on their own in the wild without humans.