I throw my trimmings into a small pond I have outside. My water wisteria looks so different from the one in the tank. It's grown out and over the pot and has purple flowers. Oddly enough, anymore trimmings I throw out melts away You could always start another plant tank
I used to put my cuttings outside to grow but have no where outside now to put them, so I'm just waiting until I move. Awesome tank by the way and wish mine had as many plants. Never had much luck with grasses sadly though...
Here is a updated shot I trimmed about 16" of vallisneria Americana as well as about 10"-12" of Vallisneria spiralis "Tiger" that is planted in the center of my drift wood. Those all will grow back very fast and I didn't remove any actual runners. I also cut and replanted two trimmings of another plant that I just can't seem to remember the name of but anyways here is the picture after the lawn service came through with the weed wacker (-:
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That's a really nice looking tank you got there.
My cuttings get tossed into the worm farm with our nightly veggie scraps. The castings from the worms eventually end up back in the veggie patch.