Chinese Ivy ( Cardamine lyrata )
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Chinese Ivy ( Cardamine lyrata )

This is a discussion on Chinese Ivy ( Cardamine lyrata ) within the Beginner Planted Aquarium forums, part of the Beginner Freshwater Aquarium category; --> I got this plant originally when I got my plant package. It never really did that good soo I threw it out sometime ago. ...

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Chinese Ivy ( Cardamine lyrata )
Old 07-17-2011, 10:46 PM   #1
 
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Chinese Ivy ( Cardamine lyrata )

I got this plant originally when I got my plant package. It never really did that good soo I threw it out sometime ago. Well when I pulled it out apparently a leaf or two fell off. Going unnoticed on my part. Well a couple of weeks later I found this (see pic below). Its the leaf! LoL that has multiple like crazy! I have tried to get rid of it. Every water change I throw out as much as I can get but some of those leaves are small and get pushed down and disappear in the tank only to reappear later just to multiple again. Is this normal for this plant? I wouldn't have thought the leaf of a plant would live on without the stem?
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File Type: jpg 2011-07-17 22.52.07.jpg (51.1 KB, 41 views)
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Old 07-18-2011, 09:23 AM   #2
 
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That floating plant is not Cardamine lyrata, it is Lemna minor, commonly known as Duckweed. It's in our profiles. It is commonly called Duckweed because it occurs in ponds throughout North America and ducks love eating it. It is highly nutritious. Anyone with plant-eating fish (goldfish, Silver Dollar, Anostomus, etc) should have this plant.

I actually like this plant, as it has its uses. In new tanks or tanks with any water issues, it is superb. It grows very fast (as you've noticed) which means it assimilates nutrients and toxins fast from the water. It is often recommended for new tanks or tanks with medications to help rid the tank water of the medication.

It often arrives on wood, other plants, even in the water with new fish. One near-invisible leaf alone will multiply. Each leaf whorl is an entire plant, and they reproduce fast. I have it in my 70g where I want it, and it has managed to spread to all the other tanks during water changes, moving a plant or fish, etc. I don't mind, as I can use a small fish net to remove it (or most of it) each week during the water change. If you want to completely rid the tank of it, you have to be sure of removing every tiniest spec of green floating on the surface. After a few weeks, it will be gone.

Byron.
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Old 07-18-2011, 10:55 AM   #3
 
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Ok so you are saying the leaf from cardamine lyrata is actually lemna minor? How can one leaf be two different plants? Sorry I am just confused on that? I actually thought at one time of getting duckweed because of its capabilities. I didn't realize I had it LoL
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Old 07-18-2011, 11:15 AM   #4
 
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Originally Posted by Boredomb View Post
Ok so you are saying the leaf from cardamine lyrata is actually lemna minor? How can one leaf be two different plants? Sorry I am just confused on that? I actually thought at one time of getting duckweed because of its capabilities. I didn't realize I had it LoL
Cardamine lyrata is a totally different plant, not related at all. Photo of this plant attached. Lemna minor is another plant, the one floating on the water in your photos. It would have come in on something, perhaps a tiny leaf stuck on the underside of another plant's leaf, whatever. Most of us don't "buy" Duckweed, it just appears--from somewhere of course, not out of the air though it may seem that way.
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Old 07-18-2011, 11:28 AM   #5
 
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Ummm well it didn't show up untill after I took out the Chinese ivy (which was weeks after i got the plants in) soo I just thought the two where the same. I have no idea where it would have came from now!? I also scrub the driftwood with a wire brush and usually boil it before putting it the tank. Soo I am confused on where and how the duckweed showed up. It might have showed up when I bought two plants from petco awhile back I thinking that's about the same time? I am not sure on that one lol anyways that part doesnt matter. Thanks for you time and patience answering my questions Byron! You are always a big help!
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Old 07-18-2011, 12:15 PM   #6
 
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When I last deliberately introduced duckweed to my 70g, it was just half a dozen little whorls that came in a fish bag. I deliberately put them in the tank. It took several weeks before the plants suddenly started multiplying. I have noticed this in other tanks too, if I get a couple of whorls in the 115g during the water change, it might be a couple weeks before they multiply. Seems the plant likes to acclimate itself. In my 70g I can chuck half of it out every week, which I do, down to maybe 1/5 of the surface, and the next week it will be back to covering half of the surface.
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Old 07-18-2011, 12:16 PM   #7
 
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It was probably stuck on the underside of a leaf. Totally submerged, duckweed does not thrive and only barely survives. When you pulled the plant out, it may have detached and floated to the surface.
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Old 07-18-2011, 03:39 PM   #8
 
duckweed is nearly impossible to get rid of, but its great for absorbing excess nutrients in the water. Just be careful as it can block out light and choke your other plants.
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Old 07-18-2011, 03:58 PM   #9
 
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duckweed is nearly impossible to get rid of, but its great for absorbing excess nutrients in the water. Just be careful as it can block out light and choke your other plants.
Yeah I have noticed this LoL. I usually don't let it get any bigger then you see in pics. Which both is sides of my 55 gallon tank.
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Old 07-24-2011, 03:50 PM   #10
 
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ive heard cardimnine to be called creeping charlie, it has a lemony minty smell :D
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