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Help! Strange dots on Desert Rose, dying leaves.

6 years ago

I bought this desert rose three weeks ago, and it’s lost about half its leaves. I repotted it after a week, into less dense soil (it was packed in hard soil that was very dense). Its roots looked very healthy (no sign of root rot). The leaves began having the issue in the pictures, and then they would turn all the way yellow and fall off. It looks to me like its being overwatered, but that is bizarre to me because:
a) its in less dense soil than it was before
b) I live in the new mexican desert and its extremely dry and hot right now
c) its caudex has seemed less full than when I bought it, which would imply underwatering. I’ve been water it about once a week, when it’s soil is super dry.

At the same time, it’s inside next to a window, getting less light than in was in the nursery, and it was next to a plant I treated for some sort of mite, although I havent seen a similar issue on this plant. These are all of the clues I’ve got.

Any help would be sincerely appreciated - I hadn’t seen one of these before and was very happy to introduce it to my home!

Comments (21)

  • 6 years ago

    do your pots get hit with sun .. the pot itself???


    when you repot.. do you put them into direct sun immediately.. ??? .. or do you give them time to get over that stress before such???


    when you repotted.. why back into such a small pot??


    what media did you use .. give us a link if its commercial ....


    welcome to the fourms ...


    ken

    vaughn greve thanked ken_adrian Adrian MI cold Z5
  • 6 years ago
    last modified: 6 years ago

    Yellowing leaves are often sign of improper watering. I do not know about those other green spots, but wonder if plant may have been oversprayed with whatever you used to treat plant next to it? What was it?

    vaughn greve thanked rina_Ontario,Canada 5a
  • 6 years ago
    last modified: 6 years ago

    It was a neem oil spray, but it was sprayed a couple of weeks after the leaves were already turning yellow. From what I've read if it was underwatered the leaves would be turning yellow at the base instead of the tips, but the conditions seem like I pretty vastly underwatering it as it is, so it doesn't really make sense that it would be overwatering....but I guess its possible?


    Also, I waited a week before repotting, and the pot is actually a size up from what it was in before. I used the black gold potting soil with some perlite. The pot does get hit with some spots of direct sunlight in the morning, but only for about a half hour.

    Thanks!

  • 6 years ago

    They do not like high humidity and high moisture - but if your plant is inside that is probably not the case. Maybe fungal disease, like anthracnose leaf spot It could have been infected before you bought it. I am just guessing, so wait until you get more answers.

  • 6 years ago
    last modified: 6 years ago

    I have found these guys like a decent amount of water during the growing season, especially when hot. My guess is you need to water more because you said the caudex seems smaller. The caudex will also feel spongy dehydrated. In the summer I water mine about twice a week. Your pot is small so you may be able to water even three times a week during the summer. Depending on your environment of course. I think you guys get summer monsoons so keep that in mind, but they do come from areas that get summer rainfall🙂.

    Around Oct thru winter your Desert Rose/Adenium obesum should be kept dry. These plants are NOT frost hardy. I bring mine inside and put them next to a south facing window once the nights start dipping to around 50F.

    Goodluck and here is some info on Adenium obesum.

    Do you know what color the flowers are going to be?



  • 6 years ago

    Hi Kara, thanks for the info! I don't know what colors mine are yet. Yours is stunning! So you keep your outside during summer - what kind of lighting conditions is it in? Thanks!

  • 6 years ago

    Rina,


    FYI, many of them come from a high-humidity area, so not liking humidity is not accurate. This is why Adeniums do so well in high-humidity areas during their growing season.


  • 6 years ago

    Yeah, from what I've read, when it's hot and they're actively growing, you treat them more like a tropical plant and give them lots of water. At that time, they don't mind humidity. It's why people in Florida and the Caribbean can grown them so well. In those conditions, they don't need to go dormant much, if at all.

  • 6 years ago
    last modified: 6 years ago

    Jeff & sld

    • Thank you for correcting me...IIRC, I read that they come from more arid areas of Africa (not meaning desert!). One of the notes I have saved says: It thrives on a xeric watering regime as required by cacti. Maybe I misunderstood what that means exactly. It make sense to me what sld said...
  • 6 years ago

    Here's a link to a good article by Mark Dimmitt about Adenium care...

    https://adenium.tucsoncactus.org/large.html

  • 6 years ago

    Does either of you know why are the leaves yellowing (from the tips) and what are those 'strange' spots?

  • 6 years ago

    I don't know, haven't seen this before. It very well not have anything to do with the OP's care, but may be due to care it got with the previous owner. Looks maybe fungal, or possibly bacterial? Adeniums can have viral problems, but I don't think it looks like that.

    The growth of the plant looks a bit stretched, with long internodes, makes me think it wasn't getting enough sun previously. That might make it more susceptible to problems.

  • 6 years ago
    last modified: 6 years ago

    The leaves on my Adeniums turn yellow when I start holding back the water in the fall. Most of the leaves will drop but a few will hang on.

    I think those spots may have something to do with the neem oil. From what I gather the leaves were turning yellow before the spots, and the spots happened after the oil got on the leaves.

    Maria Elena grows really beautiful Adeniums because her environment is tropical. She also is an amazing grower and really knows these plants🙂. Tbh I think hers never go dormant. I watch some Adenium people on YouTube and most of the people, if not all, live in tropical regions.

  • 6 years ago
    last modified: 6 years ago

    Kara, I think you're probably right about the neem oil. I forgot that OP had used it. I think Adeniums in general do react badly to neem (or other oils). I did try neem years ago on an Adenium and the leaves yellowed ad fell off. I forgot all about that as well, senior moment I guess, lol. I don't remember the leaves having those spots, but this was a long time ago. That plant ultimately survived the neem, but kicked the bucket when the heat went off the greenhouse one winter night.

    Edit to add... I do think that Adeniums are a challenge to grow well in cold winter areas. We just don't get as long a growing season as they like, and it's hard to give them enough heat and light to prolong the growing season.

  • 6 years ago
    last modified: 6 years ago

    I asked about neem oil (possible overspray causing spots) in my original post. This is what op answered:..." It was a neem oil spray, but it was sprayed a couple of weeks after the leaves were already turning yellow",,,Op didn't make it clear when spots appeared (before or after spraying).

  • 6 years ago

    If the spots happened after the spraying, it's possible they could be due to the neem. Yellowing leaves could be due to care it had with the previous owner or simply from the stress of a change in environment and/or repotting.

  • 6 years ago
    last modified: 6 years ago

    Spots appeared weeks before the neem oil, it was definitely not the cause!

  • 6 years ago

    If the spots happened weeks before the neem, and you bought it 3 weeks or so ago, then I'm going with whatever is going on is due to something from before you got it.

    Yellowing leaves could be due to stress, but the spots are odd. I would probably remove affected leaves and spray with a fungicide. Also, if it's very hot and dry where you are, and the plant is in a very fast draining gritty type mix, watering once a week may not be enough.

  • 6 years ago

    Thank you thank you! I just realized something else very strange about this - the spots are happening only on one side. I rotated it a couple of times since I had it, so I don't think it's related to the environment.... this just keeps getting more strange! Will spray with a fungicide though and try giving it a bit more water.

  • 6 years ago

    When spraying with anything, keep out of direct sun. Some plants may have phototoxic reaction - better safe than sorry! :)

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