My Thai Constellation has three, beautiful, healthy leave...
My Thai Constellation has three, beautiful, healthy leaves. Then one leaf is turning yellow and has this weird, black spots in the leaf. Does anyone know what may be causing this? #ThaiConstellation #Monstera
6ft to light, indirect
5” pot with drainage
Last watered 2 days ago
8
@Lexeeblue A "constellation plant" (likely a Monstera Thai Constellation) can develop weird spots due to a few common issues, most often related to watering, light exposure, or potential infection.
Here are the most likely causes and recommended actions:
Common Causes of Spots
Overwatering/Root Issues: This is the most frequent cause. If the soil stays wet for too long, the roots can't get oxygen and may start to rot, leading to black or brown spots with a yellow halo on the leaves.
Insufficient Light: Variegated plants require more light because they have less chlorophyll. If they don't get enough, they may reabsorb nutrients from older leaves, causing them to yellow and brown, especially in the white sections.
Fungal/Bacterial Infection: These thrive in warm, humid conditions with poor air circulation or water sitting on the leaves. The spots may look like yellow and brown circles (leaf spot disease).
Temperature Shock/Environmental Stress: Sudden changes in temperature or humidity can stress the plant, resulting in spots.
Pests: Sap-sucking pests like thrips or spider mites can cause yellowing and spotting on leaves. Check the undersides of leaves for any signs of insects.
Recommended Actions
Assess Your Watering Routine: Only water your plant when the top 2–3 inches of soil are dry to the touch. A good way to check is using your finger or a wooden skewer to test the moisture level deep in the pot. Always ensure excess water drains away completely and the pot has drainage holes.
Check the Roots: If the spot has a yellow halo or the soil is consistently soggy, gently slide the plant out of its pot to inspect the roots. Healthy roots are firm and white or light tan; mushy, black roots indicate rot. If rot is present, trim the affected roots with sterilized scissors and repot in a fresh, well-draining chunky soil mix (e.g., orchid bark, perlite, and potting soil).
Adjust Light Exposure: Move the plant to a location with bright, indirect light. Avoid harsh, direct afternoon sun, which can scorch the delicate variegated parts of the leaves. If your home is dim, a full-spectrum grow light may be beneficial.
Improve Air Circulation: Ensure good airflow around your plant to prevent fungal issues, especially if your home is humid.
Remove Affected Leaves: Carefully trim off any heavily spotted or entirely yellow/brown leaves using sterilized snips to redirect the plant's energy to healthy growth and reduce the spread of potential infection.
Quarantine and Inspect for Pests: Isolate the plant from others while you diagnose the issue. Use a magnifying glass to check for any tiny insects. If you find pests, treat the plant with a suitable insecticide or neem oil solution.
Here are the most likely causes and recommended actions:
Common Causes of Spots
Overwatering/Root Issues: This is the most frequent cause. If the soil stays wet for too long, the roots can't get oxygen and may start to rot, leading to black or brown spots with a yellow halo on the leaves.
Insufficient Light: Variegated plants require more light because they have less chlorophyll. If they don't get enough, they may reabsorb nutrients from older leaves, causing them to yellow and brown, especially in the white sections.
Fungal/Bacterial Infection: These thrive in warm, humid conditions with poor air circulation or water sitting on the leaves. The spots may look like yellow and brown circles (leaf spot disease).
Temperature Shock/Environmental Stress: Sudden changes in temperature or humidity can stress the plant, resulting in spots.
Pests: Sap-sucking pests like thrips or spider mites can cause yellowing and spotting on leaves. Check the undersides of leaves for any signs of insects.
Recommended Actions
Assess Your Watering Routine: Only water your plant when the top 2–3 inches of soil are dry to the touch. A good way to check is using your finger or a wooden skewer to test the moisture level deep in the pot. Always ensure excess water drains away completely and the pot has drainage holes.
Check the Roots: If the spot has a yellow halo or the soil is consistently soggy, gently slide the plant out of its pot to inspect the roots. Healthy roots are firm and white or light tan; mushy, black roots indicate rot. If rot is present, trim the affected roots with sterilized scissors and repot in a fresh, well-draining chunky soil mix (e.g., orchid bark, perlite, and potting soil).
Adjust Light Exposure: Move the plant to a location with bright, indirect light. Avoid harsh, direct afternoon sun, which can scorch the delicate variegated parts of the leaves. If your home is dim, a full-spectrum grow light may be beneficial.
Improve Air Circulation: Ensure good airflow around your plant to prevent fungal issues, especially if your home is humid.
Remove Affected Leaves: Carefully trim off any heavily spotted or entirely yellow/brown leaves using sterilized snips to redirect the plant's energy to healthy growth and reduce the spread of potential infection.
Quarantine and Inspect for Pests: Isolate the plant from others while you diagnose the issue. Use a magnifying glass to check for any tiny insects. If you find pests, treat the plant with a suitable insecticide or neem oil solution.
@Lexeeblue I’d cut of the infected limb and treat the wound with alcohol to callous. Monstera is a very resilient. They will grow back back in another place.👍🏽
@DreamMachine I’ve had her for almost a month and I check her when the app tells me and water her when she’s almost dry (in a clear nursery pot so I can see the moisture and roots). I water her until everything looks wet and it’s draining. Then I leave her in the sink to finish draining
@Lexeeblue Pardon my delay, I was at work! How much do you water it and about how often is Greg recommending you to? Is this leaf one of the first or oldest leaves on your plant?
@DreamMachine no worries! I was the oldest leaf. Greg recommends watering every other week. So I check it, but don’t water it unless it is dry. I water in the sink without measurements. I water until all the soil is wet and it is draining
@Lexeeblue With that info, I would say that your Thai con needs a bit more water than what it is getting. This leaf appears to be showing simple drought signs. When a plant needs more water but doesn’t have any, they will often “fire” their oldest leaf, which is the least biologically useful to them. They will use it like a water bottle, and suck back all the water and nutrients stored in that leaf so that it can keep growing. If you haven’t trimmed it yet, dont. Leave it on until it falls off because plants move much more slowly than we do, and it will send the signal to fire the next oldest leaf, if you remove this one, even if you water it right away. Not all plants show that speckling when thirsty, but this is exactly what my Thai con looked like, yellow with speckles, when I didn’t water soon enough when I first got it.
Now, it could be saying that it needs a larger amount of water, or that it needs to be watered more frequently. If it has been growing nicely, it probably has a larger root structure, and therefore is drinking more water. But you might have to be the judge of that or more frequently or larger amount, since I can’t look over your shoulder. My monsteras drink A LOT of water, so I often find that I am starting to water more and more often and then I realize I need to put it in a bigger pot. I hope this was helpful! And dont hesitate to reach out if you have any more questions! 🩶🌿
Now, it could be saying that it needs a larger amount of water, or that it needs to be watered more frequently. If it has been growing nicely, it probably has a larger root structure, and therefore is drinking more water. But you might have to be the judge of that or more frequently or larger amount, since I can’t look over your shoulder. My monsteras drink A LOT of water, so I often find that I am starting to water more and more often and then I realize I need to put it in a bigger pot. I hope this was helpful! And dont hesitate to reach out if you have any more questions! 🩶🌿