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Help with Diffenbachia

6 years ago

Hi!! Is there anyone who can tell me why my dumbcane has a really small yellow leave at the bottom stalk of the stalk? I recently found dry yellowish-brown spots on the leaves. I'm not sure if my plant is sick or it got injured by the mitre aloe spikes next to it. A new leaf has just grown pointing straight up but its very soft, tender and light green. Is that healthy? Thank you! I've never grown dumbcane before so I'm worried.

Comments (6)

  • 6 years ago

    Here are the pictures :) Thanks in advance.





  • 6 years ago
    last modified: 6 years ago

    @three4rd47 Thank you! I just read over your response to the other "dumbcane" post. Do you know if it is okay to pot these houseplants in cactus mix? The MiracleGro cactus and succulent mix that I have isn't even very good with drainage to begin with, so I added perlite to it. With the soil I potted it in now, it drains really quick and the soil dries within 3-4 days. Is that too quick and should I water the plant more often? What type of potting mix do you recommend?

  • 6 years ago
    last modified: 6 years ago

    Some here disagree with me on what I'm going to say, but I will tell you anyway since it has always worked for me: I use a mix of basic potting soil (I get mine at a local hardware store - nothing special - no fertilizer in it, etc.) and then I mix in peat moss and vermiculite (perlite is actually more recommended by many here) until the mix is very loose and sort of crumbles through your fingers. I use a plastic trash bucket to combine everything, and then put the completed mix into a separate bag (I keep empty potting soil bags to fill with my mixes).


    The potting soil I buy is very hard and lumpy - would never do for planting anything. It takes a good amount of peat moss to achieve the consistency I like, but, as said, it has worked for me for the last 40+ years of growing houseplants, as well as for bringing in annuals in fall that have been in the beds since spring.


    The mix I use drains well also, but I never water more than once a week. The peat moss retains moisture in the soil. I've found this to work well for me to when we travel and relatives come to take care of my plants. At most they only have to water every 10 days (although we hardly ever travel in the summer - when the pots do tend to dry out more frequently).


    Others here, if they respond, will likely give you different advice on potting soil composition.


    Now, as to the question about cactus/succulent mix - I have very little experience with that. I have a bag here but have used it very seldom. The only reason I have some is that I've planted small succulents for a family member awhile back and thought it best to use that mix, and so bought a bag.


    Hope some of that helps. Best of luck, and stay safe.

  • 6 years ago
    last modified: 6 years ago

    Hi Xin Xin,

    I can't speak to the plant itself, I'll leave that to three4rd47 above.

    But I CAN speak to your soil question. Cactus & Succulent (C&S) soil is fine for Houseplants when combined w/ a lot of Perlite, I'd suggest equal parts of each, you know 50/50. I mix it up in bags & keep it handy in old coffee cans.

    I grow a lot of Succulents, but also Tropicals & Hoyas (those last 2 can be considered Houseplants). I have used the mix you're suggesting and it's fine w/ enough Perlite.

    I must respectfully disagree w/ three4rd47 abt the Vermiculite.

    I used it early on in combination w/ Peat & Perlite (equal parts of each) & found the Vermiculite can break down quickly, making a soggy mess. This combination of the 3 components had been recommended by my local Indoor Gardening Society, until folks also started having trouble w/ the Peat, which if used in enough quantity, can harden over time & become water resistant & too difficult to re-wet.

    Hi three4rd47 & Welcome,

    I've seen your posts around here lately. You seem new here, may I pls ask if you have any nickname by which we can refer to you? That's a tricky name to type, so I keep copy / pasting it, that's the only reason I ask. ;>)



    Xin Xin thanked User
  • 6 years ago

    I'm not really new...been here a long time actually. Keith would do fine, which is my name.

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