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Jes, bonas. :)
Cetere, ĉu eble vi preferus "kasi suli" instead of "kasi kiwen"? ("kasi kiwen" nur tre maloftas en Tatoebo, kaj ĝis nun mi neniam vidis ĝin antaŭe.)

At glosbe.com I found this:

kasi kiwen { phrase }
a woody perennial plant, typically having a single stem or trunk and bearing lateral branches at some distance from the ground

I can't find Toki Pona in that dictionary... how did you find this definition of "kasi kiwen"? I wonder where glosbe.com has their entries. Tatoeba maybe? :)

OK, I found it. (Somehow I had to google glosbe toki pona and then I found the site with the right settings for English/Toki Pona.) I haven't heard of this site so far, but it also has "kiwen pi kasi", which is grammatically off. We have to take this source with a grain of salt.

Except if I find "kiwen suli" and it says: "wood" - "a woody perennial plant, typically having a single stem or trunk growing to a considerable height and bearing lateral branches at some distance from the ground". Then of course it's a good source! ;)

So, that dictionary has both "kasi suli" and "kasi kiwen". In practice, I have only seen "kasi suli" so far.

I don't want to say you have to change the sentence. It is defendable-ish. :) I mean "kasi kiwen" makes sense if you think of it as "wood plant", but then again, "kiwen" for "wood" seems short for "kiwen kasi" - "plant's hard material" and so, a tree would be a plant made of the material that trees are made of...

:-)