I live in the 5A planting zone.
1. Does anyone know if I dig up my overabundant Yarrow and plant it in a pot to leave outdoors will I have to put the pot in the ground or will it survive just placed on concrete?
2. Does shallow watering have a negative effect on tomato production? Our tomatoes did nothing this year compared to last year and my help is an enthusiastic surface sprayer! LOL!
3. Any ideas of how to get herbs to thrive indoors, like thyme, parsley, sage, basil?
4. IT's the end of our year and I have a small planting area, with not too much sun. We love to plant Kale, Swiss chard, Collards, etc. How to get rid of the white cabbage moths- for next year, if the Lord tarries.

White butterflies = cabbage loopers
Use bt. When they're active i usually have to spray weekly.or when i see damage.

Also zone 5

1. I've always found it hard to kill yarrow, but I do think you need more root protection for the dug up plants than having the pot exposed on concrete. Can you pile leaves/straw/etc over after the first few frosts to insulate the pots a bit?
2. Shallow watering encourages shallow rooting. And, if your helper is spraying the plants, he could be encouraging disease splashed up from the soil.
3. Start seed or transplant starts into the pots early - if they've had a chance to grow in the pot a few months they do better than one dug up and plopped in the pot then brought inside. Supplemental light is a must. Even with a south window, the winter light is still weak.
4. Bt spray or powder (specific for caterpillars), or diatomaceous earth (will also take out slugs and other bugs) on your plants.

>> How to get rid of the white cabbage moths

I haven't had that problem, so all I know is what I read.

If you keep a floating row cover over them from emergence on, held down tightly by 2x4s or soil placed over the edges, the moths can't lay their eggs and the leaves stay un-eaten.

>> How to get rid of the white cabbage moths-

I never heard of getting RID of them in areas where they exist. Just preventing or minimizing the damage they do.

I agree about the cabbage butterflies -- either use Bt or cover your plants ... or both.

I've never had very good luck growing herb plants indoors; but if you want to try, you will need to provide plenty of light (not just a window) and probably some additional humidity in the winter.

I actually think your yarrow would overwinter okay in pots; I have some sedum in pots that have no problem surviving and I'd say they are about the same as far as hardiness. If possible, put them in a sheltered/microclimate area, like near the east side of your house.

Tomatoes do better with infrequent deep watering -- so if you don't receive adequate rainfall I would suggest using a soaker hose or something like "aqua cones" -- which get the water down near the roots.

It would also be helpful if we knew where you actually live... you can enter that info in your "profile."