Where do you live?

In northern california in the yuba sutter area. So im kind of in the valley in rice field territory

I live in the Central Valley and have found that it is wise to leave the pruning until the Salvias start sending out new growth in the spring. Prune back to new growth.

Okay cool how big should I expect it to get overall? Its just in a 5 gallon pot right now but if its supposed to get really big Ill move it to something with more space in the spring

Purple sage can mean any of a number of Salvias. Which species and form is it?

Well, if it's happy with your temperature range, and it's a California native, it's most likely Salvia leucophylla.

If that's the case, then it's probably a good idea to tip it now so that the coming shrub is good and branched.

S. leucophylla often grows over 5 feet tall in as many years, but the Point Sal variety tends to remain about 3 feet by 3 feet. I recommend either a pretty big, draining pot or to put it in the ground.

Its actually salvia officinalus. The leaves are a really bright purple and green

If you are gardening in a flood plain or on a hillside where runoff channels, a raised bed with drainage and some lime would be useful. Sages can do well in damp soil, but their roots must have air.

Mediterranean sages like S. officianalis like limy soils as well.

Yeah I do live in a flood plain area but my house is elevated a lot from the street and we havent had any major flooding since ive lived here so it should be okay.

Cool sounds like im doing pretty good with it then. I got some really great soil thats nice for drainage and its nice and airy for it. And I had to had dylomite lime to the soil when I got it