The Combine command is used to combine two identical items into one larger piece. Primarily this is used to control the number of parts for alchemical processes.
In many cases the raw foraged ingredients do not have enough parts for the alchemy to work at all, so they must be combined first.
You can only combine two things that are examples of the same base item, eg. blueberries with blueberries, riolur leaf with riolur leaf. Items that are not the same will not combine.
At present, the effect on the final potency of an herb created by combining two examples with different potencies has yet to be worked out by players.
Combine currently trains the Mechanical Lore skill.
COMBINE <ITEM1> WITH <ITEM2>
Note: It is sometimes possible just to specify the first item, though there does not seem to be a pattern for which items it will work on.
COMBINE STRAWBERRY WITH STRAWBERRY
COMBINE MY JADICE FLOWER WITH MY OTHER JADICE FLOWER