How to create Woven Mandrake
Woven Mandrake is created by combining two Mandrake Root, an item sold by multiple Alchemy Supply vendors throughout Norrath. The only item that Woven Mandrake is used to make is a Picnic Basket. Every combine will give you 10 Picnic Baskets which are then used in a couple of different Baking Recipes.
Woven Mandrake (Trivial 66)
Save all the Woven Mandrake you make because the very next recipe uses it!
Below is a list of all the vendors that sell Mandrake Root. I copy and pasted the list from the Mandrake Root Vendors page to save everyone a click.
Plane of Knowledge - Mandrake Root Vendors
The O'Danos brothers are found on the 2nd floor of the Tradeskill buildings between the Guild Lobby and The Bazaar. These NPCs were added into PoK when the zone launches with the Planes of Power expansion pack which means they'll always be here... Unlike our next NPC.
Alchemist Redsa will not be added into Plane of Knowledge until the CoTF expansion I think. Most of the vendors surrounding the small bank aren't there until CoTF so I will assume she shares that same fate.
East Freeport - Mandrake Root Vendor
If Planes of Power isn't live on your server then this is the next best place I recommend you go to purchase Mandrake Root. If you're unfriendly to the humans or traveling this far would be an inconvience to you... Just make a level 1 Human and put money in your Shared Bank.
This'll allow you to still purchase Mandrake Root from this vendor just without all the extra hassal of running here or having to be good faction with the Humans that live in Freeport.
Everfrost Peaks Sven Felligan - Mandrake Roots Vendor
I can really only recommend this NPC to anyone whose a Barbarian. Sven sells a bunch of other Alchemy Reagents and you can raise Alchemy almost completely to 300 just off the stuff he sells. One of those items is of course the Mandrake Root we're after.
Garakbar - Oggok Alchemy Supplies Merchant
Klok Greenscale - West Cabilis Alchemy Supplies Merchant