What's your question? Ask

Salvia flowers have been known to change color in response to environmental conditions, which can include light levels, soil, nutrient levels, the time of year, temperature, and other factors. Stress can cause color changes in some plants, but if the leaves are still green and look healthy, the plants are probably fine. Hopefully, the color will change to blue as the plants adjust.

Salvia is a relatively easy plant to propagate from cuttings. Small cuttings will usually root within 2 or 3 weeks. Cuttings seem to root best when they are between 2 and 8 inches long.
https://www.gardeningknowhow.com/garden-how-to/projects/rooting-plant-cuttings.htm

It is necessary to ID pests before reaching for a pesticide. Pesticides have different modes of action so effectiveness for each insect varies. All pesticides are required to list the insects their product kills. If you send a picture along, we will try to ID the problem. The most common pests on salvia are aphids, whiteflies, thrips and spider mites. Pictures and treatment recommendations are easily found on the web.

This article will help you.

https://www.gardeningknowhow.com/ornamental/flowers/salvia/how-to-transplant-salvia.htm

Now is not the right time for drastic pruning. This summer, remove faded flowers. 6 to 8 weeks before expected frost, trim off the top 1/3 being sure to leave several sets of intact leaves. This should help it bush out. In early spring, remove the 2 side branches, again making sure to leave several sets of leaves. Year 2, remove the center one. Another option is to take stem cuttings to start new plants. https://www.thespruce.com/pruning-woody-herbs-1402632

Yes, they will spread, and keep forming new growth from the base. You can trim back to promote this newer growth. They may be a little late to flower, but it will improve the health of the plant.

This article will help: https://www.gardeningknowhow.com/ornamental/flowers/salvia/growing-different-salvia-types.htm