According to John Bryan in this "Bulbs" book, while Kniphofia mostly come from South Africa, a few species also come from other parts of Africa, Madagascar, and Yemen. Add to this the fact that South Africa has summer rainfall and winter rainfall areas and you will likely have quite a bit of difference in blooming periods. Bryan says they bloom spring, summer and fall. Do yours bloom after November? John Bryan lives in Sausalito, so I would have hoped he'd noticed that they bloomed later than fall for us!

As to culture, Bryan says seed germination is easy and rapid, and to sow seed in fall or spring in a sandy soil mix.

I don't know if this cultivation is different than most other Kniphofias, but Bryan says K. uvaria itself grows in marshy places and beside streams, flowers from late spring to summer or fall (in the wild it depends on the smoke from brush fires to trigger mass flowering). He makes no mention of K. uvaria nobilis.

Hope this helps.