They are the same Salvia argentea and salvia artemis. I don't know if the salvia will get bigger, but the lavender sure will, unless it's a dwarf variety.
The only way the Salvia will survive is if you don't let it bloom or go to seed.
Yours looks good, mine's been munched on by snails. :o)

Thanks for the confirmation. I'll let it self-sow and yank any wayward babies.

The lav is Lavandula x intermedia 'Grosso' started from cutting two years back. It's a fav variety and I fully expect it to reach 4' across and as high in bloom next season.

Thanks, again!

Martie

Hello~ I second the ID as Salvia argentea/artemis, Silver Sage, although I usually see it listed as S. argentea. I have grown it in several different gardens and find it to be a biennial here in WV. Yours is a nice size and looks healthy. Sometimes, if it gets too much water, it will rot at the crown, so it should always have good drainage. I like to use this plant as a foil to blue or purple flowering herb plants like false indigo or the Nepetas like 'Walkers Low'.