Hi LH, can you wash the dirt off of one so we can see what it looks like.
It might be a crocosmia
You'll know what they are when the flowers come
if you out of luck they might be Montbretia. Still got the stuff coming up 4 years after I thought I had dug it all up.
I was about to say the same Invicta2 . I too reckon montrebia.