Do you PH? What medium are they in? What are they being fed and how often are you feeding them? How often and how much do you water? The more details you can provide, the better. This will allow better accuracy while diagnosing. To be honest off the back....since they are outdoors, they are more then likely rootbound and underfed. Without knowing though....PH can lock out certain nutrients, too much water can drown them causing all kinds of problems. So until you can provide more details, it's really hard to just " guess ". The plant does show some signs of phosphorus deficiency and a few other things.