Reblooming Clematis . It depends on the clematis hon. I purchased a clematis rosemoor in the bluestone perennials clearance sale and it has been blooming nonstop since i planted it! Clematis Jackmanii Easy To Grow Bulbs from www.easytogrowbulbs.com Echinaceamaniac (clint) medina, tn (zone 7b) jun 28, 2011. It depends on the clematis hon. ( more below on the different groups.) the later bloomers, typically mid to late summer and into.