The following recipes don't work for me at all:

Potion (Charm) | Fanny Blossom + Minor healing potion
Potion (Armor Boosting) | Small Healing + Whisperwood
Potion (Poison Resistance) | Small Healing Potion + Drudanae plant

Instead, these work:

Potion (Speed) | Empty Potion Bottle + Fanny Blossom
Potion (Magical Armour) | Empty Potion Bottle + Whisperwood
Potion (Poison Resistance) | Empty Potion Bottle + Drudanae