I'm not good with fertilizer. It's hit or miss with me and I'm really not careful about measuring most of the time. I know I've given the Mandevilla stronger solutions than is ordinarily recommended for container plants. Actually it has been given full strength solutions a couple of times and otherwise some weaker ones that weren't all used up elsewhere. It lost a bit of green early on after I bought it last year. The fertilizer corrected that quickly, so I've been willing to give it fertilize and many of the container plants seldom get it from me. Not very helpful, I know, but that's my haphazard method. In some ways I'm really a careless caretaker. I'm not too keen on fertilize unless a plant is showing problems that I think might indicate it might need some. The exception has been for daylilies, so when I have some leftover from them, some plants are apt to get it whether they need it or not. I often dilute what's left so it's weak and the Mandevilla usually gets some of that if it hasn't had a stronger drink fairly recently.
