It's done for this year....but should be back next spring...if it doesn't winterkill.
Don't plant new now....it's too late, but next year plant something to succeed the nemesia.
Linda C

Too late for this year, but next year interplant with heliotrope (which in your zone should be started indoors very early), likely they will be starting to bloom just as the nemesia is finishing; the heliotrope scent is very pleasant - it depends on the variety as to how strong the aroma.

Thank you. I have heliotrope, also. Which I can only smell if I stick my nose in it. The nemesia, however, I could smell just by being out on the terrace. I need something else like that. I was hoping phlox would do it, but I can't smell that even with my nose right in the flower.

Ah, for pervasive fragrance: lilies! It may take some searching to find the *most* fragrant, but by using different species, it is possible to have lilies in bloom (here in zone 6b) from early summer through early fall. Frankly, my DH says even the low-aroma ones are too strong for him to sit by, but that's a matter of each person's nose-ability. I do start the season with hyacinths and daffodils, being especially fond of Mondragon's 'fresh-apple' scent and Earlicheer's perfume. You can also have successive blooms [and scent] by using several varieties of lavender, which to me are gently fragrant rather than heavy.

BTW, heliotrope 'marine' is considered to be among the least fragrant, try some of the other varieties to gain more aroma.