I got a supposedly mounding type (Monrovia genetic engineering of some sort) dipladenia last spring that eventually started vining late fall/winter. I brought it in, treated it as a houseplant starting October. It bloomed till December or so, and hadn't lost any leaves. Then it developed some fungal issue and kept losing leaves (they progressively turned yellow and shed, both older and newer leaves. Repotting and neem spray stopped the decline after most leaves had shed. I brought it outdoors in mid spring but did not prune any of the vines/branches except removing dead ones. Now, several months later, it has shown very little growth and 2-3 blooms so far. I am wondering if not pruning after overwintering was a big mistake. I am one of those who are squeamish about pruning - if it ain't broke, why fix it... Same thing happened to a yellow pepper I overwintered. It retained its leaves, bloomed mid winter but could not carry the fruits very long. Eventually, I pulled off the leaves after bringing it outdoors but it sat there doing nothing. It still has very little new growth. I finally chopped off most of its stem/branches recently. Lesson learnt -no pruning, no growth!. So, should I now go ahead and prune the dipladenia? Or just wait for it to do its thing?