Is there any way to obtain Jarrin Root other than that Dark Brotherhood Quest? (SPOILERS)

I don't know, sorry man. I have never seen it outside of that questline, and don't actually remember having seen it there either, but I assume I did.

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Maybe the net would yield more knowledge?

From the Guide

Unique Ingredient: The only Jarrin Root in Skyrim is given to you by Astrid In the Dark Brotherhood Quest-line.

You can use it for the quest but dont have to. Eating it will kill you instantly. It makes by far the strongest poisons of any ingrediant

Damn it, that really sucks, that ingredient is epic.

What are the poison effects? Damage?

-It is too late for me since i completed the dark brotherhood a long time ago.

[quote user="Viral Cyrix"]Eating it will kill you instantly. It makes by far the strongest poisons of any ingrediant[/quote]

Not exactly correct. I ate mine just to see and I lived. It took off about half my Health and I'm at Level 75 with about 400+ Health. It did give me the Effects afterwards also. Too bad I don't have any Perks for Alchemy (Eating Ingredient) otherwise I could have viewed more results then the first for it.

Just what the guide said

Jarrin Root has the following effects:

1. Damage Health
2. Damage Magicka
3. Damage Stamina
4. Damage Magicka Regen

It does 300 Points of damage when eaten, but if you have poison resistance it can be mitigated.  If you are looking for a substitute then try Crimson Nirnroot (found in Blackreach), it has just as potent an effect.  Deathbell and River Betty are the next most potent.

Yes there is a way to get more jarrin root. You most have hearthfire DLC. Buy a place to build a house falkreath is the first place to buy land from (the land costs 5000 gold) but you have to have 1 jarrin root. Make the front part of the house then start the main hall then as soon as you can make the garden and plant the jarrin root come back after a while and harvest it then plant the harvested one in a different spot while leaving the first on in its spot. Then repeat and there you goyou should now have plenty of jarrin root for all your poison needs. Have fun.

True, but you resurrected a year old thread that was active when Hearthfire didn't exist.

Oh is that a bad thing