Several plants have appeared in flower bed that look just like Orlay. I planted some of these 2 years ago, could seed from these have lain dormant until now? Sorry no photo.
It's certainly possible for seed to remain dormant for years. Some (notably poppies but probably other things too) need light to germinate so can stay dormant buried in the soil and then germinate when the soil is disturbed and they're exposed to light.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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It was a lovely surprise they are so pretty, just found another one!