This plant has been available to purchase in the UK from at least the end of the Great War. I have a book written by the Rev Bateman who notes that it is a great favorite with some aquarium-keepers. The plant can often be bought in London for a moderate sum. His books predate the inclusion of a print or publication date. I st Edition is 1890 or 1918, depending of sources. My copy is the 7th Edition which only really differs by the inclusion of descriptions and illustrations of fish not generally imported into England at the time of former editions. Trapa natans has not managed to 'jump over the garden wall' and become naturalized in about 100yrs. By contrast the rare, in Bateman's time, Villarsia nymphaeoides is now fairly wide spread, I assume by the dumping of surplus pond plants by gardeners. Both plants are readily available from garden centres.doesn't get a warm enough in the summer
Not sure about it at all now, I had a look at a couple more references and about 5,000 years ago it seems to have been native all the way north to <"Finland">. This is one from <"Yorkshire">poor UK summers as opposed to cold winters is a good one.
Competing hypotheses (natural and anthropogenic) to explain the earlier presence of this ‘exotic’ species in Holderness are evaluated. Maximum Trapa frequencies date to the interval 6200-4200 cal. BP
We have Nymphoides peltata in one of the lakes at work, and it is very good grower. I think it is also an invasive in New Zealand, Ireland etc.Villarsia nymphaeoides
But the Holocene was a warm period and Trapa natans has not naturalized in the UK. Leastwise I have never found it not even in the Kent Marshes where Azolla can be the Dominant plant community in both lead drains and sewers, cutting the light levels so low that obligate aquatic die.5,000 years ago
Here you see a picture showing it developing stages.. From nut to adult plant.Is Ttrapa natans a true floating plant or is it more like a water lily, a rooted plant with floating leaves.
Many thanks, I thought it was not a true floating plant, like say duckweed. Small wonder it struggles to grow as just a top rosette of leaves.From nut to adult plant.
Conserning T. Natans it is a mystery why it dissapeared from europe. It grew here abundatly at times with colder winters than today. It's seed should sink deep enough for the frost not to reach it, than it can germinate in the spring. And since it a sun worshiper and the summers got hoter means more sun less clouds.. It all doesn't realy add up why it is gone. I actualy never tried to grow it from seed, would be a nice experiment for next summer, i see if i can get some.Frost sensitivity must restrict its range in Europe.
No i never did, i stopped at Lemna minor and still strugling with trying to get rid of it. That's enough duckweed for me.. Never again if i ever get it all out.On a different note have you grown greater duckweed, Spirodela polyrhiza.
I have grown both of these and they have different requirements, Spirodela polyrhiza likes high conductivity (even for a Duckweed) and hard water. The last place I saw it, in any amount, was on the <"Steart Marshes"> in 2016, it was in the freshwater marsh, but the water was about 2000 microS.Tried without any luck at growing L polrhiza/Spirodela polyrhiza. Found L trisulca just faded away.
Thanks Darrel, I tried to grow Greater Duckweed after collecting some from a large pond in the R. Severn catchment, many many years ago. Small wonder I failed. Petri Dish & Desk Lamp with lean nutrients. Still Prof was amused. Nearly drowned myself in Avignon this summer trying to get some more out of the Rhone, high mineral content judging from its blue colour.. Failed, stick was not long enough.different requirements,