Answer: When leaves turn black it nearly always is due to overwatering. I'd prune everything back again to remove the affected leaves and then allow the potting soil to dry out slightly between waterings. Manettia is a vigorously-growing vining plant that will grow very rapidly under the right conditions. In fact, it can easily outgrow its space. The best way to manage excess growth is to keep it tightly potted (being root-bound will also promote flowering), and to prune it back sharply. Lots of new growth will come in to replace that which you prune off. Manettia does best in a sunny, warm, humid place indoors. Best wishes with your Candy Corn plant.
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