My hibiscus ate wilting, the leaves are turning to a grey hue and wilting, not the whole plant but 1 or 2 stems at a time. They are indoor plants sitting on the window sill above the heating, it has been -5 to +5C outside. I don't over water them and do let them dry out as recommended. Two of them started after fertilizing about 2 months ago so i washed the soil one continued to wilt and the other improved and now is also completely wilted. The leaves are not dry to touch on all parts. Two of them are completely wilted and one is half wilted what can i do to save them?
Has the pot got a hole in the bottom, if not that can cause wilt? Don't water at all use a mister with tepid water and do not over mist, mist every two days or so. No need to wet the soil the misting will take the water down the stem to the roots. I am new to Hibiscus, and mine is still very small since late summer. I hope you save them. You can take cuttings, put them in peat/sand if you do use green stems.
photo is a bit blurry but what are the white spots on the stems. I would spray the whole plant with soapy water and underneath the leaves also to make sure no bug is attacking it.