Sacrifice one by crushing underfoot - if it produces a very sticky mess, it's a bluebell (this is how I deal with spanish bluebell bulbs!) Crushed allium bulbs will have some structure left with evidence of layers, more like an onion. My money is on bluebells.
A trowel in the hand is worth a thousand lost under a bush.
Given that this is an overgrown, inherited garden I suspect they're more likely to be Spanish bluebells than alliums. try planting them in pots and then, if they're allium, treasure them. If not bin them before they spread everywhere and also weaken the strain of any native bluebells nearby.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
If they're Spanish bluebells, those few will be the tip of the iceberg so it wouldn't hurt to sacrifice just one!
They do look exactly like the Spanish bluebells that I dig out every year in an attempt to keep them under control (I won't say "eradicate" because that would be an impossible target). My alliums have more of a papery coating to the bulbs, which I can't see on yours.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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If they're Spanish bluebells, those few will be the tip of the iceberg so it wouldn't hurt to sacrifice just one!
They do look exactly like the Spanish bluebells that I dig out every year in an attempt to keep them under control (I won't say "eradicate" because that would be an impossible target). My alliums have more of a papery coating to the bulbs, which I can't see on yours.