Absolutely bareroot them. The ease of removing the medium and barerooting the plant is one of the great things about aggregate media like gritty. Barerooting also eliminates any potential for soil interface problems between the container medium and the soil. The way you get the soil inbetween all the roots is called 'mudding in'. Basically you make the plating hole a muddy mess and sort of shake the plant a bit to get the airpockets to rise to the surface. If the soil is fairly liquid, it will fill in very well. What is really cool is that once the water has drained and the soil has settled around the roots, the plant is very stable and probably won't even need to be staked. I have planted 15gal trees that I barerooted on a hillside where we regularly get 20-30mph winds (and even higher gusts) without staking and they weren't even phased. I will say that I don't bareroot ornamental grasses grown in something like 511. They will expand out of the 1gal planting hole so quickly soil interface problems don't matter if you keep everything watered.

Maybe a variety of Veronica.

This ground cover is about 4" tall. It has blue flowers (see second photo).

Ah yes......the olive barrel trick.They work good, don't they? And cheap....I've got 3 of them, for $15.99 each.I used 2 for rain, and the other I drilled about 200 1/4" holes in it, and use it for a compost barrel.