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Arisaema thunbergii SSP.. urashima grows in Japan in open forests, often in the vicinity of the sea coast.
For me personally it is one of the most beautiful Arisaemas, every year, when it opens its flowers, I am entranced by the coloring a broken white with dark purple, often nearly black, and then this proverbial appendix somewhere looking for moving out.

I have compiled a few pictures here just unsorted,
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Hello Sonja, hello Ralf,
how deep I plant my arisaemas - the tubers depending on the size, as deep as two to four times the vertical diameter. But then it is always a matter of feeling, rare and sensitive species, which I prefer to keep in mind, I plant a little flatter, and then when they grow, they pull themselves down anyway, as many tuber-forming aronstab plants do. Sensitive species do not come into the garden, for these I take as high plastic pots as possible.

In the garden I have with a lot of luck, they sometimes tolerate this very well.

These two Arisaema candidissimum I just digged behind the early bed a few years ago, they were misdeliveries (should be something very special . . . . .), but they thanked me, and come back every year, no matter how much weeds around them. Grows.
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And this was also to be a very rare Arisaema, Arisaema wattii, but was only something quite normal. She has also found a corner under a camellia, the same applies to this arisaema, but I am always looking forward to it when she comes back. She has not yet found a name (???).

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Right, the substrate: in my garden is in the depths clay and sand, the upper layer is, depending on the location, rather loose and humic, that has developed over the years, by foliage, etc., which has been left behind.
In my English-language Arisaema book by Guy and Lilian Gusman I have also read that Arisaemas prefer "woody soil", and I try to imitate this for the pot culture, I take the ingredients as I have them at hand: flower soil, then comes Coconut soil, which is beautifully fibrous, then finer mulch of pine bark, and sometimes also seramis or similar, for ventilation.

With all my plants, I try to understand how they live in their natural location, and then put together a substrate that pleases them.
Ralf, I could show pictures of my garden, maybe there is a suitable area for something like this here in the forum?
Greetings,
Ada

Hello

the Arisaema thunbergii var shown above. urashima is often cultivated in many varieties in Japan. There are all black, light green, white and also red forms of Urashima.
I myself have several years ago a small tuber of the form Arisaema thunbergii var. urashima 'Soshin', which is a white variety, obtained from Japan. After it came very hesitantly in the pot, I planted it out, a cuddle in the pot is simply unsatisfactory, and our climate here in the Rhineland is notoriously mild.
So it has been planted outside for several years, and comes back every year:

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The flower is not entirely pure white, but it is quite peculiar. On the third picture you can see the two Urashimas, on the left the 'Soshin', on the right the natural form. I hope it's not a search picture for you, my garden is like that there's a lot of confusion growing, but they're not bothering at all.
For me it is so, when I see this picture, I know why I love my garden.


Best wishes
Ada

Hi Aurora,

I see that right now, that I failed to answer your question, sorry!!!

So the Urashimas e.B. are quite sunny, so they get several hours of south sun from late morning to afternoon.
What kind of species do you have?

Standing in the sun I also have A. fargesii, A. candidissimum, A. ciliatum and A. costatum.
There are also those who do not tolerate sun, e.B. Arisaema wrestling, which then gets burn marks on the leaves. I planted it in the shade of a wall, where the soil does not dry out so much, so it grows very well.

Best regards,
Ada