I have had Chionodoxa sardensis in my yard for thirty years. Those same few plants. They never spread at all. This spring I did tour a neighborhood home and they had Chionodoxa all thru the lawn. Similar to your puctures. I thought it looked beautiful. As it was naturalised I feel it must have been Chionodoxa forbesii. But I ordered my same as I already had Chionodoxa sardensis and will be putting that in my lawn.
