Mandevilla are actually very easy to care for, they are rarely if ever infested by pests or fungi and need hardly any water.... But if you want to admire your flower miracle until late autumn, we recommend a little more "depth" in this topic. You might also want to read about "general information on Mandevilla" and on the "varieties".
Warm, sunny to semi-shady locations are preferable, such as east or west facing walls or bright winter gardens. Since Mandevilla can only survive outside until frost, they are most often cultivated as pot plants. This also has the advantage that the flowers are higher than if the plant were on the ground level. The plants can remain in the supplied pots if there is no alternative, especially for the XL types. Replanting into larger pots makes sense because the plant can grow larger and produce more flowers. The plants must be carefully replanted with a mixture of peat and garden soil; there should be a layer of gravel at the bottom of the plant pot for drainage. For the S and M sized Mandevilla, a pot capacity of 4 - 10 litres makes sense, for the XL types with strong growth a pot with 8 to 25 litres should be chose. Slim, tall pots are effective, and if at all possible the pots should be raised. The pots should be protected against excessive heating by choosing lighter colours. It is also possible to use additional cachepots as protection. The potting must be windproof and, if appropriate, theft-proof. After watering, there should never be stagnant water if you use a cachepot or a saucer. Dampness is lehal for Mandevilla! Read the general information page to help you choose a climbing aid for the Mandevilla.
Yes, it is actually enough to water 1 - 2 times a week. The plants form storage roots, hoard water and need very little of it because their leaves are covered with wax. In very hot weather, however, water should be poured daily. Watering more often stimulates growth!
Standing water is deadly for a Mandevilla. No water should remain in pots and bowls after watering. Please remember to pour out the remaining water after watering!
The Mandevilla sold by FassadenGrün are already fertilised with long-term fertiliser. A liquid fertiliser can be applied every 1 - 2 weeks, especially after replanting. This may also favour the colouring of the flowers.
Actually, Mandevillas are not pruned. The plants "clean" themselves, i.e. the withered flowers dry out and fall off by themselves. The precious shoot growth is never shortened. If some shoots become too long, they can be coiled downwards around the plant and form new buds there.
Mandevilla plants are designed for one season. They are grown over many months in partly heated greenhouses before they're sold, so that they flower at the customer's when they are delivered in April / May. Of course Mandevilla can be overwintered, but this is something for the most enthusiast gardeners. What is needed is a bright place at 10 - 15 degrees Celsius, e.g. a winter garden or an unheated staircase. Sometimes louse infestation might occur here. After overwintering, the plants are cut back and fertilised. The growth types S and M may have very thin, long shoots in the following year and the flowering might start much later.