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Here's an article with a photo of potted spurge: https://www.gardeningknowhow.com/plant-problems/weeds/spotted-spurge-control.htm

This plant, also known as Euphorbia, has some specific growing requirements. Here are articles you can check to see if your plants are receiving what they need: https://www.gardeningknowhow.com/ornamental/cacti-succulents/euphorbia/growing-euphorbia-plants.htm

http://sonomamg.ucanr.edu/Plant_of_the_Month/Euphorbia/

Deep watering may have allowed the roots to stay wet for too long, or your plants may have contracted a fungus. You may want to prune the bad stems down at the base of the plant, and if you do decide to prune them back, please wear gloves - the sticky substance inside them is toxic.

Spurge is also known as Euphorbia. You are in Zone 10 and shouldn't have any problem leaving it in the ground over the winter, but if you want to protect it, you may wrap it lightly in some kind of insulating material. It needs some water, but don't water it from the top and don't let it get soggy, or get completely dry. Also, beware of the sticky substance within the stems - it could cause skin irritation.
https://www.gardeningknowhow.com/ornamental/cacti-succulents/euphorbia/growing-euphorbia-plants.htm

The increased sun angle, and decreased daylight hours will be enough to keep it from getting too beat up over winter.

If you find that the sun does scorch the plant, you might try and erect a shade cloth for a portion of the day.

Here is some information on the care of the plant:

https://www.gardeningknowhow.com/ornamental/groundcover/pachysandra/pachysandra-ground-cover.htm

https://www.gardeningknowhow.com/garden-how-to/info/shade-cover-tips.htm