It is recommended that any fertilizing (especially nitrogen) be completely withheld no later than when the cane matures (that littl knob looking thing on top with no more leaf on). Earlier isn't bad but later is.
As some fertilizer most likely be still present in the mix, earlier hault is probably safer.
I stop fertilizing my nobiles in July or August which is when mine normally nears the end of growing phase.
During the dormant, do not allow plants go bone dry as this is bad unlike many people faithfully believe.
Since they are not growing during this time, they dont' take much water but they still need water to stay alive and for preparation of buds and all.
How cool you keep nobiles during the dormant period decided how you want to water them.
Main focus is to prevent root rots but keep the plants sufficiently hydrated.
I used to keep all mine at a friend's unheated south facing sun room. It gets pretty cold but never freezing at night. During the day, it gets pretty warm (almost hot) on sunny winter days but when there's overcast, not so warm.
I would water accordinly to the weather. You don't want to keep your plants too wet during cold time.
I would follow weather news and water (or soak) early morning of sunny days (about once week or so)
If weather continued on to be quite cold even during the day, then I would not water or if plants are too dry and pots feel too light, I would just mist like crazy!
You may err on the slightly drier side than wetter side to avoid possible rot.
I haven't rot any and all flowered like fabulous little (some not so little) bunch of bouquet!
---------- Post added at 04:39 PM ---------- Previous post was at 04:38 PM ----------
PAM- Did this gift come with a name tag by chance?
I'm just curious.
I love your setting, the vase complements the blossom nicely I think.