I had fourteen cultivars be very sluggish coming up this spring. I made a list and made notes twice, once on May 16, then two weeks later, on June 2. By June 2 all are showing. As you can see from my list, 11 of the slowpokes were planted in 2017. At May 9th, the fourteen slowpokes were:
Spacecoast Technical Knock Out, tet, SEV, planted May 2016, growth by June 2
Star Child, dip, SEV, planted Sept. 2017, growth by June 2
Alpine Mist, dip, DOR, planted August 2017, growth by May 16
Ben Lee, dip, EV, planted Sept. 2017, growth by May 16
Big Smile, Dip, DOR, planted Spring 2015, growth by May 16
Blink of an Eye, dip, SEV, planted Sept. 2017, growing well by May 16
Blue Alert, dip, SEV, planted July 2017, growing well by June 2
Blue Flirt, dip, SEV, planted Sept. 2017, growth by June 2
Bluebird Butterfly, tet, EV, planted July 2017, growth by June 2
Classic Romance, tet, SEV, planted May 2017, growth by May 16
Dixie Blues, dip, SEV, planted Sept. 2017, good growth by May 16
Face of the Stars, tet, SEV, planted July 2014, growth by June 2 (this one did this before and was slow to come up in 2016)
Intricate Eyes, tet, SEV, planted August 2017, growing well by May 16
Anyway, I am glad to see them all come back, so at the moment I have no "goners"