Yes, you can grow basil indoors year-round when you set up the right conditions in your home. The biggest challenge comes during winter when daylight drops short and weak. Add a grow light to fill that gap and your basil will keep producing fresh leaves. Many home gardeners enjoy basil in January by making a few simple changes.
I started growing year-round indoor basil three winters ago. I got tired of the grocery store herbs that wilted in my fridge within days. My first attempt failed because I thought the south window would provide enough light through December. The plants grew tall and thin with leaves barely bigger than my thumbnail. Once I added a $30 LED grow light on a timer, everything turned around. Now I pick fresh basil for pasta sauce even on the darkest days of winter. I also tested moving plants closer to heat vents during cold spells and found that helped a lot too.
Light is the factor that changes most between summer and winter for your indoor plants. Summer brings 14-16 hours of strong sun pouring through your windows at a high angle. Winter drops that to 8-10 hours of weak light hitting at a low angle. Penn State Extension notes that basil needs 14-16 hours under grow lights to match good summer conditions. UMN Extension says even 10-12 hours of artificial light can keep basil alive through northern winters.
Temperature swings cause problems for basil when you grow near windows in all seasons. Summer brings hot glass that can scorch leaves touching the pane. Winter brings cold glass that chills roots and turns leaves black overnight. Keep pots a few inches back from window glass year-round to avoid these extremes. A heat mat under your pots helps maintain warm root temps during cold months when windowsills drop below 60°F (16°C) at night.
Dry winter air from heating systems makes growing basil all seasons harder than you might expect. Humidity can drop to 20-25% in heated homes while basil wants closer to 40-50% to stay happy. Group your plants together so they share moisture as water evaporates from their soil. Set pots on trays filled with pebbles and water so humidity rises around the leaves. A small humidifier near your herb garden works great if you have several plants.
The best way to get continuous basil harvest is succession planting all year long. Start new basil seeds or cuttings every 4-6 weeks so young plants mature as old ones decline. Each plant produces well for about 4-6 months before it gets woody and bitter. With three or four plants at different ages you always have at least one in prime shape. This rolling approach means fresh basil lands on your cutting board no matter what month it is.
Here is what you need for year-round indoor basil success. Get a grow light with a timer set for 12-16 hours based on your window light. Use pots at least 6 inches (15 cm) deep with good drainage holes. Keep temps above 65°F (18°C) at all times near your plants. Boost humidity during dry winter months with pebble trays or by grouping plants close. Start new plants on a regular schedule so you never face a gap in supply.
Read the full article: How to Grow Basil Indoors Successfully
