11-01-2012, 05:35 PM
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I also do not have great success with this plant. I've had mine for over two years, in one tank, and it goes through spurts of growth when it will multiply so as to cover most of the surface (a 48 X 18 inch surface area), then suddenly it declines over a matter of a couple weeks to a few leaves. It has done this pattern several times.
This has been my only experience with Frogbit. But something that may be related, is the species. The true Amazon Frogbit that is in our profiles, Limnobium laevigatum, may not be the plant. I bought mine under this name, but it has turned out to be the European/Asian species. I discovered this when mine flowered, as the flowers of this latter species are very different from those of the Amazon species. There is mention of this in our profiles, click the shaded name.
The species I have (and there is a third native to North America, and this may also be what we have) are obviously temperate, not tropical, so this might perhaps explain our problems with this plant. I must say that during its growth phases, it is a beautiful floating plant.