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 Thalia dealbata 
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Joined: Sat Mar 29, 2008 1:42 pm
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Location: Cornwall
Post Thalia dealbata
I am sure it was following a thread on here that I bought the one I spotted last September at a plant sale, anyway its done really well and has its first flower spike
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Do they set seed? or need dividing?

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Tue Jul 14, 2009 5:33 pm
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Location: Rockville , Maryland , USA
Post With
With it flowering now you should get seed, the seeds take a long time to mature. These plants do best in the biggest pot possible for your pond, they can be stunted and flower early if they are confined.pushing in a clay ball full of 3 or 4 month time release Osmocote for Veg will help feed the plant. These plants are very heavy feeders. They are hardy if you sink the pot in the pond or are pretty ice free. I believe Andrew in Holland has over Wintered his Thalia genticulata in his Pond , The green form that is not the Red Stem it's a wimp in Winter.Thalia dealbata is easy to divide and propagte from divisions.
That's about it really. Other than James Knock had heard of or seen a white flowering form that seems not to exist anymore. Be nice to find one tho.
All the Best
Steve

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Last edited by Steve in france on Wed Jul 15, 2009 11:46 am, edited 1 time in total.



Tue Jul 14, 2009 6:17 pm
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Location: koekelare, Belgium...
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they are much hardier than liturature sais! i forgot to put mine deeper in the pond and during that cold period it was frozen solid for over two weeks....they had no problem with that...even in the parts were they have got -20°C they survived without problem!

btw...there is a report of a cidp that survived -21°C in the netherlands. ofcourse it was totaly defoliated but new spears are emerging :shock:. another shocking report is that of a B. eriospatha that survived -20°C in eastern Belguim. also of this one all the leaves died but new growth is emerging!...

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Tue Jul 14, 2009 7:04 pm
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Anyone growing the red stemmed form?


Wed Jul 15, 2009 1:33 am
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I have just looked up Thalia genticulata and now I want one of those as well! is seed available or am I going to have to buy a plant?

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Wed Jul 15, 2009 7:33 am
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charliepridham wrote:
I have just looked up Thalia genticulata and now I want one of those as well! is seed available or am I going to have to buy a plant?


http://cgi.ebay.com/10-Red-Thalia-Genic ... 1|294%3A50


Wed Jul 15, 2009 10:45 am
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Post I
I did send some seeds of the Red Stem to people on the Hardy Exotics board ( some members are here too) someone said that some seeds had sprouted .
I order new Red Stem from Stokes Tropicals every year as they are very hard to over Winter for me. I think a small division would do ok on a Sunny window ledge I've just not tried it. Mine tend to be mature and seeding at the end of the season so there are no small divisions to be taken. Sets seed pretty well here with the hot Summers and long Fall. The Red Stem comes in a lot of different shades, from pink to almost black, dark red to purple being the most common.
I grow mine in 25 gallon or bigger tubs filled with clay, I mix in time release Osmocote before planting, then I use a few Pond Tabs every week or so through the season. They normally get about 6 ft tall with flowers heading up 4 or 5 feet more. I'll try and find a pic of last years plants.
All the Best
Steve
from last year

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Image

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Wed Jul 15, 2009 12:08 pm
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Location: Leidschendam, The Netherlands. (52 N latitude)
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Thalia dealbata is found as far north, as a wild plant, at the mosst southerly point of Illinois and also Kentucky and Missourri. These parts of the US get now and then cold winters so that explaines it hardiness.
The Groene Prins in Steenwijkerwold gets a big one in his pond. I have also seen large ones near Nieuwkoop not far from where I live. They grow best in rich mud along a ditch our a natural pond in full sun.

Alexander

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Sat Jul 18, 2009 12:14 am
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I grow all my pond plants in varying sized bags which I make out of that weed suppressant membrane (the synthetic sort!) and filled with soil. I tend to make them up to 30Kg dry weight but above that they are difficult to handle, but I am not sure I want to give supplementary food so it sounds like my Thalia will never reach its full potential :( Still it looks good as it is :)

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Sat Jul 18, 2009 6:43 am
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Not having a sensible pond to put it in when I sucumbed to T. dealbata it had to go in a pot standing in a deep saucer that was supposed to be kept brimming with water. Good intentions eh?

Needless to say days brimming:days bone dry, tended fairly rapidly to wards the drier side, but it didn't seem to mind. As long as it got waterd (irregularly) with all the other potted stuff and an occasional feed it did pretty well. Not as lush as it might have been, but it made very good height and flowered happily for several years until it eventually faded away - I think from a combination of never having been repotted, a coldish winter, and a particularly dry and inattentive spring.

Anyway, encouraging enough that the next time I fall over one I'm intending to just plant it in the ground and try to remember to soak it occasionally.


Sat Jul 18, 2009 10:38 am
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woodruff wrote:
Anyway, encouraging enough that the next time I fall over one I'm intending to just plant it in the ground and try to remember to soak it occasionally.

They used to grow it as a border plant at Great Dixter (they may still, I haven't been for years and must go again to see if they're keeping it in the Christopher Lloyd style) I don't think it gets quite as big in a border, presumably because it is not as wet, but it still looked nice and flowered.
Pete


Sat Jul 18, 2009 1:07 pm
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Post Re: I
Steve in france wrote:
I did send some seeds of the Red Stem to people on the Hardy Exotics board ( some members are here too) someone said that some seeds had sprouted .


This is a bit of a coincidence Steve. I have a few of the seeds which you sent to Tropical Pete and which he distributed.

I sowed them early this year, February I think, but had just about given up on them as none had showed. However I returned yesterday from a few days away to find two sprouts about 2 - 3 inches high, with possibly a third just peeping through the surface of the compost. I have no idea how I will keep them alive over winter, but at least I've got over the first hurdle.

I like the idea of the bags made from weed control fabric Charlie. I have only a small plastic pond which I put in to get some frogs hopping about, at present I have a small T dealbata which will need repotting in time so I'll try this next year. This also started to flower while I was away, maybe there is a lesson to be learnt here.....


Sun Jul 19, 2009 9:22 pm
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Post Mike
Mike as they will still be smallish by Winter you could just grow them on a windowsill. The first year we were here in the US I got a very crowded and dwarfed pot of Red Stem from a local nursery, these plants made full sized plants by the Fall. Crowded dwarfed Thalia are easy to divide and in many ways, better than large plants for dividing. So what I'm saying it if you want the plants for next year , which would seem best, then once they have a good start you can starve and crowd them. The small plants will still make new stems even when they are crowded, each new stem or clump can be broken off in the Spring when the weather warms up . As long as there are a few roots attached to the stem it will grow. I often remove all the leaves but for the new roller in the center.
If you don't remove the leaves the division may die. I've not had a division taken back to just one roller die, so it's good method, These single roller divisions take awhile to get going, that maybe to do with the Springs Temps.
Anyway this is my advise based on my experience of growing the Red Stem for the last three Summers. Your conditions will be very different so experiment :D
Best of Luck
Steve

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Mon Jul 20, 2009 2:23 am
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Right, thanks for the advice Steve. I am not expecting them to do much this year so it's good to hear that they can survive indoors without too much fuss, and the tips on dividing them are interesting.


Mon Jul 20, 2009 7:23 pm
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Post Re: Thalia dealbata
Well 8 years on from this original post and I still have the Thalia dealbata, no picture of it now as its just too embarrassing! just 2" sticking out of the pond and one leaf, what ever these need it didn't get it here! if I remember I will try and rescue it

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Mon Jul 31, 2017 7:14 am
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