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Brunnera has a beautiful foliage.

https://www.gardeningknowhow.com/ornamental/flowers/brunnera/growing-brunnera-plants.htm

You can plant Brunnera in spring or fall. Water well to get the new plants established.

Here is a link with more information

You can trim away any ragged parts of the plant in fall.
Winter mulch is recommended. Cutting the plant back in the spring is better as leaving the leaves on to protect the crown through winter will give better results.

https://www.gardeningknowhow.com/ornamental/flowers/brunnera/growing-brunnera-plants.htm

This article should help
http://www.gardeningknowhow.com/ornamental/flowers/brunnera/growing-brunnera-plants.htm

I would usually recommend planting these in spring for the best results. If you plant now, you may lose some or all of them, however some will likely survive. To give them the best chance they should be propagated in spring. Here is an article for more information about these plants: https://www.gardeningknowhow.com/ornamental/flowers/brunnera/growing-brunnera-plants.htm

This appears to be a fungal infection. I can see signs of it on all of the plants in that picture.

You will need to treat with a fungicide. This article will help:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

Make sure to allow the soil to dry out down to about 1 inch between watering. Any drier will be bad, as well as leaving the soil wet. You may find that the moisture needs of this plant will not be the same as the surrounding plants. They will likely stay infected, which will keep the Brunnera in a diseased state.

Here is an article that will help you to measure soil moisture:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm

Here is an article that will help you with the care of the plant:

https://www.gardeningknowhow.com/ornamental/flowers/brunnera/growing-brunnera-plants.htm