Nymphaea family vary in 4 different rootstock types.. Those Tuberosa rhizomes (grows like a carot), Odorata rhizomes (bulb, gingseng root), Marliac-type and the Mexicana type rhizome.. The first is one of the most vigoreus growing type the marliac the slowest and the Mexicana seems to be typical for the tropical sp. The most winter hardy lilies we get in the garden centres are commonly the Odorata (bulb), the tuberosa and Marliac i've not yet seen. It is also not realy commonly described wath kind of rhizome cultivated sp. have. For this we need to dig into cultivation data. The mexican is probably the kind that looks like fat soft roots more like you see on Nymphoides sp. but not realy sure about that. The N. Glandulifera roots look like it. Most tropicals are night flowers the Glandulifera is too..
@Guest i can't find a good picture and all my lilies are potted right now but i can try to make a smal drawing from how to do it with an odorata rhizom. So when you have a mature medium or small size pond lily tuber (cultivar from the garden centre) in your hand it has a crown where all the leaves come out, the tuber and fat white long roots hanging down.can be as big as a small potato.. But if you inspect it closely you might see little pimpels (round nodule) grow out of the tuber with a tiny leaf sprouting out.
Plant it in the tank in a bed of fine gravel with some weight to it because it likes to float. On top of a clay tab. Coarse gravel might be to rough on the small fragile baby leaves. But it will survive and takes a week or 2 but you'll see it grow.. This way you will have a tiny dwarf lily for a few years to enjoy. Lilies take all the energy from the tuberosa.. Hence if the tuberosa is tiny it can't grow fat stems and large leaves. Rather not put it in one of your dirt tanks..
But don't expect flowers very soon, but tiny floaters may appear within a few months.
@Nelson keep an eye on this one too..
🙂 Few years back found in South america near a place called Santarem..
But not so long ago identified by botanicus as Nymphaea gardneriana.. Seems to be pretty common in south america.
It is waiting in anticipation before it is finaly available in the trade.. But probably will one day after all it is discovered already..