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Old 04-19-2019, 10:02 AM   #1 (permalink)
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Default Vallisneria and Sagittaria

I have several species of Crypts, 2 different Echinodorus, a very healthy Crinum, Hygrophila, 2 types of Java fern and many water lilies growing quite well in my aquarium, but Vallisneria and Sagittaria just will not grow. They have not died yet but they are, slowly, over 8 months. Good lighting, CO2 injection, fertilizer, pH 6.7 to 6.9, GH 6, KH 4 and temperature 80 degrees F. What are they lacking that the rest of the plants can do perfectly well without?
Gull darn it, in the last 10 months the 3 Cryptocoryne blasii that I purchased have become at least 50, my amazon swords are 18 inches tall and producing runners at a rate I can hardly keep up with, the Java ferns are taking over and the Crinum has 20 4 foot leaves and has bloomed twice in the last 4 months, but I can't grow grass!
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Old 04-20-2019, 10:29 AM   #2 (permalink)
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Default Re: Vallisneria and Sagittaria

Maybe one of the other plants releases a growth-inhibitor that affects Val and Sag ???
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Old 04-22-2019, 09:55 AM   #3 (permalink)
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Yeah, allelopathy could be it, although I've heard many times that dwarf sag is unexplicably finicky, so maybe not.
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Old 04-22-2019, 10:45 AM   #4 (permalink)
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Default Re: Vallisneria and Sagittaria

More light most likely is needed. Also,the substrate should not be too coarse like rough gravels or pool sand fine either.
I have mine in 6" pots with potting soil with a inch of sand on top. They also are getting a few hours of direct sun from a window. They now make after 9 months a solid,thick wall of Val that goes to the top of a 24" tall aquarium and then across the surface another 16" I sometimes cut that back so other plants can get more light. But I tell you..its so thick no light shows between the leaves even in sun.

I would never plant Val in a tank that is all soil substrate with gravel on will just engulf the whole tank. One other thing- Val is impervious to algae growth. Not even hair algae can colonize it. Every leaf is perfect dark green.
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