Crimson Nirnroot

Glow and chime
Nirnroot is distinguished from other plants due to their aural glow and the chiming sounds heard when in close proximity to a patch. Crimson Nirnroot also possess this property, although the chiming sound emitted from them is slightly off-key. The Crimson Nirnroot saplings that grow back, whilst unharvestable, do emit a small glow...

Growth
According to the last paragraph of Sinderion's Field Journal, Crimson Nirnroot is attracted to water just like Nirnroot is.The Crimson Nirnroot often grows near fungi in Blackreach, which sustains it and gives it its ability to grow away from open water sources. Crimson Nirnroot also regrows, unlike its common counterpart. However, regrown plants are not harvestable.

Locations

 * Blackreach - There are 30 that can be found, as part of a quest,and this is the main region where Crimson Nirnroot grows. They re-spawn over an undetermined period of time. A sample can also be found inside some buildings.
 * Outside Blackreach - Far less likely to be encountered, Crimson Nirnroot can be found outside of Blackreach.

Quests

 * Bring 30 of them to Avrusa Sarethi for A Return To Your Roots.
 * Crimson Nirnroots can be used in place of normal Nirnroot in the misc. quest from Ingun Black-Briar, "Collect 20 Nirnroot".

Potions
When mixed with ordinary Nirnroot, the Crimson variant creates a potion with no less than four effects, since both roots have all their properties in common.

Damage Health

 * Deathbell
 * Ectoplasm
 * Falmer Ear
 * Human Flesh
 * Human Heart
 * Imp Stool
 * Jarrin Root *
 * Nightshade
 * Nirnroot *
 * Red Mountain Flower
 * River Betty
 * Skeever Tail
 * Small Antlers
 * Troll Fat
 * Void Salts *

Damage Stamina

 * Blisterwort
 * Blue Butterfly Wing
 * Bone Meal
 * Canis Root
 * Cyrodilic Spadetail
 * Giant's Toe
 * Jarrin Root *
 * Nirnroot *
 * Rock Warbler Egg
 * Spider Egg

Invisibility

 * Chaurus Eggs
 * Ice Wraith Teeth
 * Luna Moth Wing
 * Nirnroot *
 * Vampire Dust

Resist Magic
* multiple effects
 * Bleeding Crown
 * Chicken's Egg
 * Hagraven Claw
 * Lavender
 * Nirnroot *
 * Tundra Cotton
 * Void Salts *

Bugs

 * Collecting Crimson Nirnroots after beginning Avrusa Sarethi's quest may cause the journal's counter to subtract, instead of add, acquired plants.


 * (360) If removed from inventory, by placing in a chest or by dropping (needs tested), one Crimson Nirnroot could subtract several from the Avrusa Sarethi's quest's counter. [E.g. Storing five Crimson Nirnroots in chest at my house subtracted 11 from the total count. So when I had 28, it told me I had 17.] It is not clear to how many are exactly subtracted. Remove one could take two away from the total, but removing another one more could reduce the count by six. Removing a third could then drop it by two.