My Mandevilla was doing great until about a month ago. Now all of its leaves have dried and fallen off and I have been left with is a plant with no leaves or flowers. I have had some aphids on my green pepper plants (second question. . . big leaves, but not flowering). Can either of these plants be saved? Leaves on underside of pepper plants are spotted with brown spots. As for the mandevilla, can I trim it down and have new growth?