Why do bottoms of stem plants turn brown? - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 10-07-2012, 02:43 PM Thread Starter
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Why do bottoms of stem plants turn brown?

When I trim and replant stems, the part in the substrate plus a little more turns brown and withers away. Why is this? Am i grabbing the stem too hard with the tweezers? Am i cutting in the wrong place?
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post #2 of 10 (permalink) Old 10-07-2012, 03:01 PM
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The stem of stem plants is what takes oxygen and nutrients out of the water. When you put it in the soil or sand, you're cutting off it's oxygen supply. This causes that section to die.

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post #3 of 10 (permalink) Old 10-07-2012, 04:37 PM Thread Starter
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Ok thanks. I guess u just gotta plant them as shallow as possible.
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post #4 of 10 (permalink) Old 10-07-2012, 04:40 PM
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Ok thanks. I guess u just gotta plant them as shallow as possible.
I thought this too. It can be very frustrating though.
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post #5 of 10 (permalink) Old 10-07-2012, 06:22 PM
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The stem of stem plants is what takes oxygen and nutrients out of the water. When you put it in the soil or sand, you're cutting off it's oxygen supply. This causes that section to die.

They are stem plants and they do not mean they are floaters. They do fine planting in the substrate. In fact, they will root too. Is the light. When you have don't sufficient light getting to the lower section of the stem, it would melt.


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post #6 of 10 (permalink) Old 10-07-2012, 06:41 PM
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I would think it is more a combination of two things:
Mechanical damage (getting pinched by the tweezers)
Lack of oxygen under the substrate.

If it is mechanical damage the part that did not get squished can still grow roots into the substrate, and the plant will likely do fine.

If it is lack of oxygen in the substrate the plant usually does not survive. If you see the brown creeping up the stem take another cutting pretty high up and remove the rotting part. Lay the cutting down on top of, or barely under the substrate, and put a few pebbles on it. Also do something to raise the oxygen level under the substrate.
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post #7 of 10 (permalink) Old 10-07-2012, 07:02 PM
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It's lack of light or more possibly lack of co2. Used to have this happen all the time until I got co2 right.
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post #8 of 10 (permalink) Old 10-11-2012, 03:18 AM Thread Starter
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It's not really a problem for me, I was just wondering. The damage only goes up a little bit then stops, so its probably just the little part that got cut, but then the next section starts to grow roots.

Thanks guys
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post #9 of 10 (permalink) Old 10-11-2012, 03:37 AM
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The stem of stem plants is what takes oxygen and nutrients out of the water. When you put it in the soil or sand, you're cutting off its oxygen supply. This causes that section to die.
What?
I put my stems in about 2". I don't use a scissor to cut them just use a fingernail. Never had it turn brown from planting in substrate.Stem plants get nutrients/O2 from the entire stem not just the lower part

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post #10 of 10 (permalink) Old 10-11-2012, 02:03 PM
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What kind of substrate are you using? I haven't had this problem with anything but sand. I think the sand was just smothering them.
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