Mandevillas need a potting mix that has good drainage and yet retains moisture well. You’ll want to keep the potting mix from ever drying out all the way. Keep the mix evenly moist, but never sitting in water for long periods of time. It is okay to let the pot sit in water for an hour or so wick up moisture that may have escaped the plant during watering, just be sure to pour off any remaining water after that.
You’ll need to prune your Mandevilla vine yearly in the spring, preferably before new growth begins to appear. Cut the plant back to within and inch or two of the woody growth from the year before. This will send out a wonderful flush of new growth which will support the fresh new flowers.
Re-potting should also be done in the spring, probably near to or at the same time as pruning. If the plant has outgrown its pot, you can pot it up to the next pot size. If you don’t need to re-pot, simply top-dress the potting mix.
Mandevillas can be a magnet for pests. Keep an eye out for all of the most common houseplant pests: whitefly, mealybugs, spider mites, scale and aphids. It is especially important to check plants that have spent time outdoors. Plants that have been outside may even end up with insects living in their pots. Those bugs will not always be damaging to the plant itself but will most likely be unwelcome in your house.
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