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Questions About Oleander

  • Answered by
    luis_pr on
    July 23, 2021
    A.

    I would check the watering regime (frequency, amount of water), soil type and the soil moisture (before watering so they are neither too dry or too wet). In the summer, they need more water than in the spring, even though they are drought tolerant. Water deeply when the soil is dry. Skip watering when the soil is already moist or soggy. There is also a rare bacterial disease called oleander leaf scorch that yellows out leaves.

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  • Answered by
    luis_pr on
    July 27, 2021
    A.

    Hard to say without seeing the symptoms progressing to that. Too much or too little water can cause leaf drop in oleanders. Water deeply but let it get a little dry in between waterings. Keeping the soil damp or soggy at all times could cause leaf loss. Also look for honeydew and sooty mold in leaves infected by pests such as aphids.

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  • Answered by
    luis_pr on
    August 21, 2021
    A.

    Oleanders are salt tolerant but you will probably need to prune the stems just as if they had been killed by a bad freeze and see if they return. Avoid fertilizing. You can water often and deeply to try and alleviate some of the salt but do water deeply when the top 1-2 inches feel dry. If you water too much and too often, you run the risk of getting root rot. I would discard the mulch to remove some of the salts and to temporarily facilitate soil evaporation. Put new mulch when the soil has dried out a little or wait until Spring 2022 if the mulch is sold out. Watering is probably the most important thing now. I would look for new growth either later this year or in Spring 2022. If nothing happens by May 2022 (no new growth), it may have lost.

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  • Answered by
    BushDoctor on
    September 24, 2021
    Certified Expert
    A.

    Because people ship plants from place to place, insects have made their way into areas that they are not normally found. In modern times, you can localize the general population to a region, but you should expect to see them outside of that region, as well.

    https://www.gardeningknowhow.com/ornamental/shrubs/oleander/oleander-caterpillar-damage.htm

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  • Answered by
    GKH_Susan on
    December 17, 2021
    Certified Expert
    A.

    Rejuvenation pruning may be a good idea. If you have an insect problem, that would take care of it. First you might try watering more deeply when you water. If they are just getting shallow waterings, they may need more. They should be watered deeply once or twice a week, according to the articles below. Under or overwatering can cause yellow, dropping leaves. But they do need pruning. I'm including a link to an article on pruning, and it does say, you can do it over a few years, rather than all at once, depending on the health of your shrubs.

    https://www.gardeningknowhow.com/ornamental/shrubs/oleander/watering-oleander-plants.htm

    https://www.gardeningknowhow.com/ornamental/shrubs/oleander/oleander-dropping-leaves.htm

    https://www.gardeningknowhow.com/ornamental/shrubs/oleander/rejuvenating-overgrown-oleanders.htm

    https://www.gardeningknowhow.com/ornamental/shrubs/oleander/oleander-leaf-scorch.htm

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  • Answered by
    luis_pr on
    December 16, 2021
    A.

    Probably. I prefer to “clean” them up myself before taking those drastic steps. I remove dead wood first to see what is left so I get a better view of the existing plant structure. A bad freeze here in Texas in Feb 2021 did for free what your landscaper suggested.

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  • Answered by
    GKH_Susan on
    March 20, 2022
    Certified Expert
    A.

    If you don't plant another oleander, the disease likely will not pass on because you reduce the chance for infection by the insect vectors. Since the disease is transmitted through insect vectors and not the soil, you don't have to remove the soil if you decide to get another oleander.

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  • Answered by
    GKH_Susan on
    March 21, 2022
    Certified Expert
    A.

    We don't have an oleander video so I hope the one you saw was helpful. You can cut oleanders back severely but since yours is stressed, you should prune a bit at a time over several years. Here is how:

    https://www.gardeningknowhow.com/ornamental/shrubs/oleander/rejuvenating-overgrown-oleanders.htm

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