Monthly checklist · summer
Houseplant Care in August
August is the last full month of strong growth before plants slow down in fall.
Quick answer
Take final summer cuttings. Last big repot opportunity. Keep fertilizing through August, then give one final feed in early September.
Light in August
The sun angle drops after the summer solstice, so window light slowly weakens toward fall.
Watering in August
Still at summer frequency. Watch nights cooling toward month-end — plants may slow water uptake. Keep fertilizing for now: Illinois Extension puts the fertilizing season between March and September.
Pests and problems to watch in August
Plan to bring outdoor-summered plants in when nights dip consistently to around 50°F, as Iowa State Extension advises. Check them for insects and rinse the foliage before they come inside.
What to plan now
Plan indoor spots for outdoor plants returning. Order grow lights now if your winter windows are dim.