serrata Soya temari

serrata subsp. Yezoensis

With dark blue fertile florets surrounded by pale blue sterile florets on acid soil? Gardens found in the 28 pre 2000 surveyed:  DA  LAG Gardens found in the 10 surveyed in 2010: DA LHS ESV KAL NAN AW UKPlant Finder: 2012 = 3 nurseries