The bellflower (campanula) with its delicate, mostly blue or purple calyxes grows in many gardens. Depending on the variety, it forms dense carpets of flowers and delights the viewer with its joy of blooming between June and August. As popular as the flower is, experts disagree about its toxicity.
The bluebell is probably not poisonous; but it is not certain
Bellflower probably not poisonous
As much as the representatives of the “Bellflowers are poisonous!” faction claim in various internet forums, scientific evidence for this claim has not yet been provided. In fact, the bluebell does not appear in a single register of poisonous plants, and at least the Rapunzel bellflower was (and sometimes still is) grown for its fleshy, nutritious roots. Incidentally, the same plant gave its name to the girl "Rapunzel" in the fairy tale of the same name. However, since the toxicity of many other species has not yet been confirmed or disproved, the principle of caution applies until then: Ergo, you (or your children or animals) do not eat any parts of the bellflower, even if you most likely have no symptoms of poisoning apart from nausea or similar will notice.
Many legends and myths about the bellflower
The bellflower probably owes the rumor of its toxicity to the numerous myths and fairy tales that refer to the delicate flower - which are not always to be interpreted positively for humans. If you have a young daughter and she, like so many little girls, loves fairy tales, take a closer look at the illustrations in the relevant books. There the fairies are often depicted with the blossom of a bluebell as a headgear. Far from being due to the creativity of modern children's book illustrators, these depictions are instead due to centuries-old myths. Bluebells have always been considered flowers of fairies and are said to summon them to their gatherings.
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Incidentally, a very old story from England tells that a person who - even unintentionally - is inside a ring of bluebells is exposed to the fairies' judgment of life and death.