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Top Questions About Mandevilla Plants

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Questions About Mandevilla Plants

  • Answered by
    Nikki on
    October 9, 2012
    Certified Expert
    A.

    There are a number of reasons why the leaves may turn yellow. One might be overwatering. Too much water causes yellowing of the leaves and mandevilla do not like overly wet feet. Check the soil around your plant to see if it's too moist and, of so, allow it to dry some. Mandevilla favor humid conditions. If your plant is exposed to the sun, the soil may be too hot (the most likely case for yours in addition to over watering). Try misting/spraying the leaves with water in the mornings and keep the soil moist (NOT wet).

    Another possibility could be too little water. If this is the case, the yellow leaves would be curling up as well. Mealy bugs can occasionally affect these plants, causing them to become weak and leading to yellow foliage. Finally, plant stress due to a change in location, temp., etc. can lead to yellow leaves.

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  • Answered by
    Nikki on
    October 22, 2012
    Certified Expert
    A.

    It can be any number of pests that attack plants. Fortunately, they are all eliminated the same way. I would recommend spraying the plant with neem oil. It is very effective and safe for people and pets. Here is more information:
    https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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  • Answered by
    Nikki on
    October 24, 2012
    Certified Expert
    A.

    Plant stress due to a change in location, temp., etc. can lead to yellow leaves and subsequent leaf loss. It should recover on its own, going dormant over winter. Once temps warm back up the plant will begin putting out new growth.

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  • Answered by
    Nikki on
    December 7, 2012
    Certified Expert
    A.

    Yes, it does sound as if it's a goner. However, this article may help you determine that for certain: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

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  • Answered by
    AnnsGreeneHaus on
    December 7, 2012
    A.

    It sure sounds like it. Sorry. ...We have a highly technical method of determining if a plant is indeed deceased..."snappy, bendy"! If you grasp the stem between both hands and try to put both ends together and it snaps, it's usually dead. (and I mean you can hear the snap). If it bends (flexes) before breaking, there is usually some life left in the plant. Of course, there is always scraping the bark to the cambium cell layer to check for vitality!
    This article might help: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

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  • Answered by
    theficuswrangler on
    January 14, 2013
    A.

    Put it in a spot indoors where it will receive as much light as possible, make sure it doesn't dry out between waterings, but doesn't stay too wet either; stick a wooden dowel or skewer into the soil to test it, it should feel slightly damp, and if you pull up some soil and squeeze it between your fingers, it should stick together, but no water should come out of it. This is the time to water again, and water enough that you get a runofff from the drainage holes. Don't fertilize it, and should be fine in the spring.

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  • Answered by
    Nikki on
    May 8, 2013
    Certified Expert
    A.

    The plant might be getting too much nitrogen fertilizer. It may need phosphorus, which is responsible for blooming in plants. Try a high phosphorus fertilizer or add bone meal to the soil. Here is more information: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

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  • Answered by
    AnnsGreeneHaus on
    May 8, 2013
    A.

    This article should help: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm

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  • Answered by
    AnnsGreeneHaus on
    May 11, 2013
    A.

    Mandeville's are tropical plants. They require temperatures above 50 degrees. Since you didn't specify your USDA zone, if your winter temps were below 40-45, your plant is probably dead. This article should help in understanding Mandeville plants: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm

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