Houseplant Care in May
Once nights stay above 50°F, tropical plants can move outside to a shaded spot, with more light introduced over 10 to 14 days. Indoor plants stay on a full fertilizer schedule.
Light in May
South and west windows can be strong enough to scorch sensitive species, and sheer curtains cut the light (Iowa State Extension). Plants moved outside need shade first: Iowa State Extension advises waiting until nights are consistently above 50°F, never moving houseplants straight into full sun, and introducing more light over 10 to 14 days.
Watering in May
Outdoors, warmer temperatures and more light change how often plants need water, so Iowa State Extension advises checking soil moisture frequently and watering thoroughly when the soil is dry to the touch. Indoor plants are on their summer routine.
Pests and problems to watch in May
Plants outdoors meet a new set of pests. When they come back in, Illinois Extension advises inspecting them and keeping them apart from your other plants for 2–3 weeks.
What to plan now
Take cuttings of vining plants such as pothos, philodendron and tradescantia while they are actively growing, as Illinois Extension advises for stem cuttings.