Houseplant Care in July
Keep humidity up for tropical plants (most indoor plants grow best at 40 to 50%, per Iowa State Extension). Move plants out of cold AC drafts. Continue full watering and fertilizer schedule.
Light in July
Shades and curtains drawn against the heat can greatly reduce light, per Iowa State Extension. Either move plants to brighter spots or use grow lights to compensate.
Watering in July
Watering needs depend on light, temperature and humidity (Iowa State Extension), so plants in air-conditioned rooms can dry out at a different rate from the rest of the house. Check each pot before watering.
Pests and problems to watch in July
Spider mites favor dry air, and most indoor plants grow best at 40 to 50% humidity. Group humidity-loving species together: Iowa State Extension notes that grouping plants raises the humidity around them, calls humidifiers very effective, and lists pebble trays as another option.
What to plan now
If you plan to run a humidifier this winter, order it now, before the heating season starts.