This plant has fascinated me for years.
These bulbs would sprout and flower in late winter and early spring in my parents old 'garden' and are very common in older properties. I have always called them Winter Gladioli although that is not their true name.
A quick PlantSnap lead me to the name of Crocosmia x crocosmiiflora which is apparently a registered weed. It's ability to multiply and pop up anywhere seems to fit my observations.
https://keyserver.lucidcentral.org/w...osmiiflora.htm
I'm not completely confident with my ID of this plant so any input would be appreciated.