What is the Most expensive potion you can create... using ONLY the ingredients that you can grow yourself in the hearthfire greenhouse / Gardens ?

At the moment i am growing wheat and blisterwort to make a supply of health potions, but soon i'll have enough to last me a long time but i will still want to keep working on my alchemy level, and i read that the more expensive the crafted item the more XP gained from it.

Paralysis would be the most expensive i think.

Here's the ingredients needed for making one, i think at least two of them are plantable.

http://elderscrolls.wikia.com/wiki/Paralyze_%28Skyrim%29

Thanks Larson! Canis Root , Imp Stool & Swamp Fungal Pod I'll have planted.

Does having 3 ingredients actually make the potion better? or is it worth just using 2, becuase i'd have more of them then.

Actually the most expensive potion is made from Giant's Toe + Bear Claws + Hanging Moss.

if you have heartfire. Hiscarp and Salmon roe is very expensive. It was the first potion i made and bumped me up 2,5 levels and was worth 1890 gold i belive.

We're talking about 7000 gold potions, much easier to achieve with fortifying loop.
damn i wish i could grow that jarrin root...

Do giants respawn?

You can, you can also grow eggs and all the dawnguard plants.
http://skyrim.nexusmods.com/mods/25655/

After 10 days, the salmon roe is much easer to get, and fast respawn.

Mora tapenilla,Impstool & canisroot,nice and expensive and a very usefull Paralyze/lingering damage health poison.