Advanced Herbalism is a re-working of the herbalism concept first created by Balor and Shanjac. It adds a new skill called "Herbalism" to the game. This skill determines the player's ability to harvest organic ingredients in the wild. When a plant is activated, its ingredients are placed directly into your inventory and it is disabled for 30 days, making harvesting feel more natural. There are seeds available for growing new plants, skill trainers, skill books and a weeding hoe for digging up some plants.
Get the Planter Add-on for this mod as well so you can grow things in pots.
--- Andoreth

Short description from Gluby's Comprehensive Herbalism Mods Catalog and Guide:
This is the cadillac of herbalism mods, and boasts an impressive set of features, notable among which is the ability to plant seeds anywhere - even in transportable planters - and to dig up the plants if desired. [Apr. 2004. Includes variant ESPs for different combinations of Morrowind with and without the expansions.]

* Chance of recovering ingredients is based solely on a newly-created Herbalism skill.
* New Herbalism skill improves with use, and can be improved with the aid of several new NPC skill trainers and skill books.
* Amount of ingredients gathered is affected by Herbalism skill.
* Once picked, a plant disappears, reappearing 30 days later-each plant is individually dated, rather than all plants automatically respawning on the first day of each month.
* Incorporates Shanjaq's seed scripts (see Herbalism v1.1, Seed Edition, above), making it so plants yield seeds during certain moon phases, and allowing the player to grow new plants anywhere. Further expands upon Shanjaq's seeds as follows:

o Allows the player to dig up and permanently remove (delete) plants that have been grown from seeds by using an equippable "hoe ring."
o Modifies some vendors and containers to sell/contain seeds (the merchant NPCs themselves are not modified).
o Has an available add-on with purchasable planters for transportable plants.

* MagicNakor's Bloated Morrowind (see below) is integrated into the mod.
* Mostly original coding, created with only some input from Balor's Herbalism.
* Slightly heavier scripting than Balor's mod, but not substantially.
Source: Gluby's Comprehensive Herbalism Mods Catalog and Guide
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For full detail description see the included "Advanced Herbalism Readme.txt"

I have created a patch too address a minor bug in the jjs_herb_ashyam1 script. Remember too load this patch after the main mod.
-- Morten79