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RE:Val and sag

>There's an old factoid that Sagittaria and Vallisneria won't grow well
>together because of some kind of allelopathic interaction.  I think I
>first saw that asserted among the first posts I ever read on *.aquaria, I
>mentioned it a while back in my first ever letter to this list and it's
>mentioned rather casually in Diana Walstad's book.
>I have Sagittaria subulata and Vallisneria americana growing in the same
>55 gallon tank.  The vals have leaves 1/2 inch wide and 3 1/2 feet long.  
>The sag has leaves about the same width and up to 9 inches long (or so). I
>have to ruthlessly cull the stands of both plants to keep them from
>getting too big and too crowded.
>Today while cleaning that tank I noticed that the two stands were not just
>living happy, separate lives, but had intergrown.  All participants in the
>party appeared to be having a good time.  At least, that is, until I
>culled the interlopers.
>Is there actual evidence for allelopathy between Val. and Sag?  Or is this
>just an internet legend?

I had the same experience as you. Seems not to be the case in
*aquariums*....... but could be far different in nature.........
Tom Barr