Fernleaf Bleeding Heart problem
I recently planted 2 small Fernleaf Bleeding Hearts close to each other in our new shade garden. We added some Nature's Helper according to the directions on the bag to the good new garden soil---which was brought in, and is not native---since we know that shade plants need fairly rich organic soil. One of the Bleeding Hearts, however, soon started having problems: the lower foliage began to turn black and die, and now the whole plant is almost gone.
My question is simply this: did the one Bleeding Heart die because we didn't mix the compost in evenly enough in that spot, or is there another cause for black foliage? The dead one got almost exactly the same water and sunlight as the one that's still alive and thriving.