I hope you pruned him about 1/2 inch above the leaf node this past late winter/early fall as they bloom on new wood...Did you fertilize your clematis..they should be fertilized with some rose fertilizer or tomato fertilizer the same time you prune them...are you watering it enough..remember clematis like to have their roots stay moist...Jeanne

Hi edibble, how old is your Jackmanii? Has it been in decline for the last few years OR is this lack of vigor something new? If you dig down near the plant, is the soil in good condition, being light and mellow?

Terry

I have been having problems with my Jackmanii too.Last year I thought I had lost it,but near the end of the season it suddenly shot out of the ground and had a few blooms. This year it started off well with buds showing ,then suddenly they all died off and there is nothing happening showing at the moment. I am very disappointed this was a beautifull vine for years.I think I may have to shovel prune it and replace it with something else.