I can get this one locally. EASTERN SNOWBALL
Viburnum opulus 'Sterile'
The nursery has
plants from Monrovia which has a great website monrovia.com. They say it is cold hardy to
zone 3 and
zone 8 for heat. The flowering time is only listed as Summer. How late does your variety bloom? Are the blooms round? I will try to attach a pic from the site I mentioned. Thanks for everyone's help!
[img]http://www.monrovia.com/PlantInf.nsf/269905a1fb059eb48825683c0080938a/ad60d8daa327a3c98825684d00726803!OpenDocument&Highlight=0,viburnum&Click=042f18e31a76addd88256966006aa4b7/$Body/1.4106[/img]