I gor my first milkweed plant 2 years ago. The first year was great! This year only 1/2 of the plant came back. Now I have noticed that the other half of the plant is dying (I think). I’ve noticed the little red bugs which everyone says are harmless to the plant but I usually try to pick off the ones I see. I just cut off the dead limbs. Will it still come back next year and how can I prevent it from happening to the whole plant?