Hello,
I am not sure why my Justicia carnea plants have yellow leaves and continue to get new ones. new growth is good, looks dark and green, older growth looks like photos. pH is good, I have them in shady area I keep them moist, .... Can somebody please help me with this? I have 5 of them and they all look the exact same with this problem, i have been battling this for months ! the veins are not green,.. the leaves turn yellow until the point whee they have no green at all left and they fall off the plant...