Winter is a stressful time for ferns indoors. Special attention to their care will keep them fresh and green. Probably most important to their health is the relationship between temperature and humidity.
The air in a house or apartment is often hot and excessively dry. As temperature increases, relative humidity decrease. The resulting humidity is injurious - to most to ferns. You can increase humidity around plants by settlung pots an a tray of pebbles which are kept moist or a tray of damp sand. Misting, with caution, will increase humidy, but remember fungus growth is accelerated by overmoice conditions a special risk for ferns with finely dissected fronds on which droplets of water as likely to collect.
Temperature requirements depend somewhat on the origin of the species. Most warm-climate ferns grow well in the average winter warmth of the home. You should learn to know the preference of the species ducts.
The size and type of pot and humidity of a room influence the amount of water used by the plant. Some ferns require more water than others. No hard and fast rule can be given oor watering.
Ferns require light, either natural or artificial. The amount of light depends on the type of fern. Winter sun, which is of short duration and weaker the winoww faces north, almost any fern will do well. Natural light allowing 14 hours daily.
Inspect both sides of te fern fronds weekly for scale. Remove the scale with fingernails or toothbrush.
To keep your ferns looking their best during the winter, remove any brown fronds which happen to develop becuase of low humity.