Because of this yearly dieback, pruning a bleeding heart to keep it in check or to form a particular shape is not necessary. However, the plants will die back naturally each year before the frost, and it’s important to cut back the dying foliage at the right time to keep the plant as healthy as possible. Cut the narrow stem with sharp shears. 4 Trim back the foliage to the ground after it yellows and dies back naturally – usually in midsummer as the weather warms.
I think it is best to allow it to die down naturally but it will soon be gone, now! Mine are still flowering, but it's normally best to leave until it's died back, as Posy says. If you think you can safely lift it out with a good rootball, then do so though.
If it's well watered first, well watered in, it should be ok. Sep 21, Prune the bleeding heart plant to the ground once the foliage dies off and turns yellow in color. Remove all remaining plant foliage by cutting it with a hand pruning clipper at ground level. The plant will wilt and collapse to the ground if left to dry on its own. Some varieties will die off during late summer and others not until fall.
Jun 25, A: Yes, you can certainly cut back a bleeding heart as soon as it yellows, but I must admit, this is a little early for that to be happening. Usually they last until the heat of July sets in. As the bleeding heart plant begins to yellow and wither away, foliage may be cut back to the ground as a part of care for bleeding heart. Do not remove the foliage before it turns yellow or brown; this is the time when your bleeding heart plant is storing food reserves for next year’s growing bleeding hearts.