Knowing what to plant indoors in October comes down to three main groups. You can grow kitchen herbs, microgreens, and small overwinter starts. All three do well in steady indoor temps. They pay you back with fresh food all winter long.
I start basil and parsley on my kitchen counter every October. Last year I sowed 6 pots by the south window. By Thanksgiving I was clipping fresh leaves into soups. By February the plants stood 8 inches tall and still gave me a weekly handful.
October works well for an October indoor garden because the room sits at 65°F to 70°F (18°C to 21°C) all day. This range hits the sweet spot for herb and lettuce growth. Shorter days outside mean a grow light becomes your main tool.
A simple LED shop light over your trays gives the same light as a sunny summer window. Plants pull energy from the bulb instead of the dim fall sun. The room temp stays steady, so your seedlings grow at a faster rate than they would outdoors in October.
Kitchen Herbs
- Top picks: Basil, parsley, chives, cilantro, mint, oregano, and thyme all do well from a fall start indoors.
- Light needs: Most herbs want 12 to 16 hours of bright light from an LED panel about 6 inches above the leaves.
- Harvest window: Start picking leaves in 5 to 6 weeks and keep harvesting through March or April.
Microgreens
- Top picks: Radish, broccoli, sunflower, pea shoots, and lettuce mix grow as quick microgreens in low trays.
- Time to harvest: Most are ready in just 10 to 14 days from sowing, giving you a fast win in mid-October.
- Soil depth: Use just 1 inch of soil in a low tray and broadcast seeds thick across the surface.
Overwintering Seedlings
- Top picks: Pansies, violas, sweet peas, and onions for next spring can be started in October indoors.
- Why now: A long, slow indoor start gives stocky plants that go outside in March for an early garden show.
- Pot size: Use 4-inch pots so roots have room through the long indoor winter before transplant time.
Salad Greens
- Top picks: Loose-leaf lettuce, arugula, mache, and spinach in a deep tray give you cut and come again salads.
- Light needs: Bright light from an LED keeps leaves crisp and green, not pale and floppy.
- Harvest method: Snip outer leaves with scissors and the plant keeps making more for 8 to 10 weeks.
Run your grow lights on a timer for 16 hours a day. I set mine to come on at 6 in the morning and switch off at 10 at night. Plants need a dark rest period to grow strong, so do not leave lights on around the clock.
Mist your seedlings once a day to keep the air around them moist. Indoor heating dries the air fast in October and can stress young plants. A cheap spray bottle from the dollar store works just fine for daily misting.
Bottom water once a week by pouring water into the tray below the pots. Let the soil wick up moisture for about 15 minutes, then pour off any extra. Top watering wets the leaves and invites mildew in low-light indoor spaces.
Pick 2 or 3 crops to start with for your first winter seed starting round. Basil, lettuce, and radish microgreens make a great trio. You get herbs, salad, and quick wins all from one sunny shelf or LED setup.
Set up your system in early October and you can keep growing all the way through March. The savings on grocery herbs alone covers your seed and light costs by Christmas in most homes.
Read the full article: Starting Seeds Indoors: 10 Steps for Success
