clematis STILL won't bloom
my 2 clematis are planted together, feet in the shade, all the rest, full sun. they have been in this spot going on 8 years. one has bloomed once, and the other, once, on another year. they get adequate water, and have the most beautiful foliage. i use compost every year, and was told to use bone meal, which i did for a year, all to no avail. i assume it must be the nutrients, but can't find any 5-10-10 that was recommended to try....any more suggestions? thank you.