Why does all my Ludwigia hate both me and probably you? - The Planted Tank Forum
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post #1 of 9 (permalink) Old 02-07-2020, 01:38 AM Thread Starter
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Why does all my Ludwigia hate both me and probably you?

I have three varieties of ludwigia in my tank. The Ludwigia ovalis grew beautifully and so much that I recently had to trim it down.

The super red and the Ludwigia peruensis (also called Ludwigia glandulosa) however are showing lots of new growth but the leaves are much more narrow than the originals. Photos of the plants online show this isn't just a change from emersed growth. It's hard to search for what they could be defficient in because googling "ludwigia with narrow leaves" is just going to return hundreds of pages about the narrow leaf variety of Ludwigia.

Does anyone have any idea what could be causing this odd growth? Everything else (including the ovalis) seems to be growing great. The light was lower for a while to combat some algae, but has been turned back up for a few weeks now. The returning redness of the super red would lead me to believe they are getting enough light. No CO2. The temperature is cooler than some tanks on here at around 72 F. Ammonia and nitrites at 0, nitrates at about 10 ppm. KH 4. GH 8

In the pictures you can see a few of the older much broader leaves which don't appear to be melting. All of the new growth however are these much skinnier leaves.
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post #2 of 9 (permalink) Old 02-07-2020, 05:39 AM
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Are those from the original bought stem or have you snipped and replanted since buying them?

Not sure if its the same for you but mine the original growth was like that, started dying back and many times the stems started rotting at the base. I would trim the top off, knock off a few of bottom leaves and replant. Once I did that the replanted portion grew much fuller with bigger better looking leaves. New stocks would sprout from the trimmed bottom leaves as well making a bushier plant.

Or I am thinking of a different plant which looks similar and am way off lol.
Edit: I think mine are ludwigia repens but not 100%.
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post #3 of 9 (permalink) Old 02-07-2020, 07:58 AM
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I can keep almost anything in my planted tank except ludwigia! Would love to know why!


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post #4 of 9 (permalink) Old 02-07-2020, 03:32 PM
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Quote:
Originally Posted by Silvanus View Post
I have three varieties of ludwigia in my tank. The Ludwigia ovalis grew beautifully and so much that I recently had to trim it down.
All stems shown look like are adapting to submerged growth.
Is there a pic of the sp. red?


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Growing is not that difficult.
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post #5 of 9 (permalink) Old 02-08-2020, 01:32 AM
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HEY! don't drag me into your plant relationship issues! Ludwigia and I get along just fine!.. I just don't like to trim that often that's all..(haha)
+1 you bought emersed grown (above water) stems, they're getting new submerged growth. All old growth will rot/fall off. new leaves will grow just give it 1-2 months to adapt aka grow a lot more leaves. You can trim the stem and replant the bare stem once old emersed leaves fall, it will grow new roots and stem off shoots with new leaves.
Unless you are buying from a hobbyist that specifies 'submerged grown' pretty much all stems (and 95% of aquarium plants sold by stores local and online) are grown emersed-they grow quicker, easier to maintain and ship that way.
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post #6 of 9 (permalink) Old 02-08-2020, 08:30 PM Thread Starter
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The old leaves dropping off isn't what surprises me as much as how narrow the leaves of the new growth are staying. Pictures of these submeged varieties don't look remotely as skinny. Maybe it is just the initial growth after adjusting and broader leaves will come in? These are almost 3 months old by the way and I think they are largely done adapting

I'm still think maybe my tank is deficient in something that leads to such weird leaf growth. But then the other plants seem fine...

Or much more likely, Ludwigia just holds a strong burning hatred for my soul.
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post #7 of 9 (permalink) Old 02-09-2020, 01:04 PM
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Submerged growth can look substantially different than the emersed growth you purchased. IMO let them continue to transition and don't chase a deficiency right now. Looks like they are making the trnasition pretty well. Takes time and patience!



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post #8 of 9 (permalink) Old 02-09-2020, 04:34 PM
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Quote:
Originally Posted by Silvanus View Post
Or much more likely, Ludwigia just holds a strong burning hatred for my soul.
LOL. I feel your pain. Maybe a grief & loss support group is needed?

Had similar issues in my first tank. Attributed it to insufficient lighting, and the floaters outcompeting the ludwigia for water column nutrients in my dirted tank. The leaves just kept getting smaller & smaller, until it eventually just disappeared.

Trying again with some better super red stock from burr740 in a new tank with a stronger light. Will see if consistent liquid ferts will keep it and the other stems happy.

Here's hoping....
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post #9 of 9 (permalink) Old 02-09-2020, 06:51 PM
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I'm still think maybe my tank is deficient in something that leads to such weird leaf growth. But then the other plants seem fine...
That might b the case. unfortunately I don't have this plant in my tank. The only way to eliminate the possibility of a deficiency is to run a lab test of your water. If any nutrient comes back as reading zero you should increase the dose of that nutrient. I have used this one:

https://www.amazon.com/ICP-Analysis-.../dp/B071HVPBVD

Cost is $30 dollars and you get the results in a week. It is capable of detecting nutrients down to 0.001PPM. It will not detect nitrogen but will detect K,Ca,Mg,P,s,cl,fe,Mn,B,Zn,Cu,Mo,Ni essential plant nutrients. Plus it will detect a lot of other elements in the water.

When I used it I found I was deficient in Cl and Mn. In your case just looking for zeros in the test might not be enough. Since most of your plants are doing OK it might be that this plant need a lot more of a nutrient while most other plants just need a little. I might look carefully at your Mn,Zn,Cu levels Mn because several people in the last year have seen low Mn levels recently with the ICP-OES test and others that haven't used this test have experimented with making their own micros have found better results with higher Zn levels. Many fertilizers provide only small amount or no of copper due to corrosion of copper pies adding a lot. But some homes don't have high copper levels while others do.
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