This year I  found that  shiso  volunteered in many of my fig pots. I didn't pull the herb, but let it grow on the theory that:

1. It wasn't robbing the fig of too much in the way of nutrients.

2. I know how it grows and can use it as a barometer for the fig trees.

3. It will tell me sooner than the fig tees when I need to water.

4. It will  help keep the dirt cool on hot days and might prevent water loss by evaporation.

5. I like the smell.

I want opinions. Is any part of my reasoning legitimate? Is it worth it? Am I just cock-eyed? Does anyone else do this (on purpose, not by accident like me)? If so, what do you use as a cover plant and why? 

The water warning it gives is probably worth a lot.

I like the clover I grow by the plants, it too tells me asap that it needs water way before the tree does! In addition, it is known for being a Nitrogen fixer.  It is the coolest thing to pull them up when they are too crowd  and see the little nodes where the bacteria attaches to release the N, a nature regulator for N.  In fact, the little pots I have the  crimson clover growing it, seems to grow better than the others without, it also gives a bit of shade and looks very nice draping on the side of the pot.  When too many leaves, i cut some and feed them to my bunny.

Thanks guys. It's nice to know I'm on the right track, if only be accident. I know this topic was covered with in-ground and raised-bed plantings, but don't recall a discussion regarding potted figs. I like the clover idea, for it's nitrogen-fixing attributes. I wonder if there are other good companion plants for figs in pots.