||02-02-2012 11:11 PM
They don't always get that big. The variety I'm to which I'm referring (thin leaves, bright green, not twisted) averages 12"-24". More height can be achieved by closer planting, and the reverse is true. Also, I do not run high light or CO2, so that may changes things in my situation. But I think the majority of the confusion comes from the several varieties and hybrids, and the disagreements on nomenclature. My Vallisneria Spirals (not forma tortafolia), "Straight Val", "Italian Val", or whatever name/hybrid it is, grows like a weed under 2 T8 lamps, sending off runners like a track coach, but doesn't ever hit the top of my 21" deep tank. I've also grown Vallisneria americana (longer, wider, darker leaves). I have no experience with Vallisneria americana var. biwaensis, Vallisneria spiralis forma tortafolia, Vallisneria nana,Vallisneria americana "mini twister", Vallisneria spiralis "Tiger", and others.
So maybe we're thinking of different types of Val? I don't know, all the different types and names makes my head swim. :-)