My poinsettia that I've had for two or three years has like this whitish discoloration around old leaf nodes on the lower part of the stem. I've been looking for information about anything related to this on and off for five months, and to no avail. The only thing remotely close, visually, to what is going on with my poinsettias' stem that comes up as a result is scab. However, I do not think it is scab. Looking at photos of plants with scab, the lesions appear concave and crusted--not to mention it also appears to affect the leaves after some point. My poinsettias' leaves appear to be perfectly fine, and if anything, the area around the nodes is slightly raised, or swollen.
Here are some photos:
A better shot of the leaves to show they aren't showing any symptoms:
Is this just some sort of sap buildup caused from pruning? Or is it the plant barking? Is there anything I can do to treat this, or is it normal? Like, I really don't know what this is, and while my poinsettia doesn't seem to be suffering any complications from this for as long as I've noticed it, it still concerns me.
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Some other information about my poinsettia and its current care:
My plant is about two feet tall, and it's a little bare down low which probably is because I don't really do much to groom it aside from pruning, but the plant seems healthy overall. I had to cut off one of its stalks back in late November because a houseguest accidentally snapped off the top of the stalk, where all the leaves where. I was pretty upset about that, but aside from that, the plant does not appear to be showing any signs of trauma.
Regrettably, I have not found the time to repot it since I've gotten it two or three years ago. It's still in its original pot, which is 6.5" in diameter. I am looking to repot it this spring. With a plant at its height I feel like the pot could potentially put strain on it. My poinsettia came with florist foam at its base and I'm not actually sure if I should remove it when I transplant it? I kind of want to. It's probably only 3" x 3" but I'm not sure how deep it goes. I worry that it may be inhibiting healthy root growth. But I don't know how to go about removing it without hurting its roots either. ***
Any input about this would be helpful.
I don't water it too often. I let its soil dry out quite a bit before watering it again. On average, it probably gets watered every 10 to 14 days. Though I have a feeling that the foam is retaining water, and I'm wondering if that could be a factor in the symptoms my poinsettias are exhibiting.
I have no idea who distributed this plant. My parish gives away the poinsettias that sit on the altar after Christmas, and my dad brought one home for me one year.
Thanks in advance