Houseplant Care in October
Water less often as growth slows. Fertilizing should already have stopped after the early-September feed. Inspect plants brought in from outdoors for pests.
Light in October
The sun is low and light is weaker. Give light-hungry plants your best windows; University of Missouri Extension notes that south-facing windows give the brightest light for the longest time.
Watering in October
Confirm soil moisture every time. Slow uptake means saturated soil stays wet longer, and UC IPM links root rot to poor drainage and overwatering. Hold off on fertilizer: Illinois Extension puts the fertilizing season between March and September.
Pests and problems to watch in October
Fungus gnats appear if soil stays too wet; yellow sticky traps catch the adults (Iowa State Extension). Watch for the first signs of winter spider mite outbreaks as heating kicks on.
What to plan now
Test grow lights now. Place humidifier near humidity-sensitive species before the heat comes on.