Yes, you can grow mint indoors year-round with the right setup for light and humidity. Your biggest challenge comes from giving the plant enough light during short winter days. Most growers need some help from grow lights for mint to stay productive through the darker months of the year.
I tested both approaches over two winters with identical spearmint plants from the same mother. One plant sat in my best south-facing window while the other got LED grow lights for 14 hours daily. The windowsill plant survived but grew leggy with small pale leaves. My grow light plant stayed bushy and kept producing harvestable leaves all winter long.
Indoor mint plant care changes through the seasons as light levels shift. Summer windows may give your mint everything it needs for strong growth. But that same spot falls short once days get shorter in fall. You need to watch your plants and respond when growth patterns change.
Your mint on windowsill needs at least 5 hours of direct sun from a south or west facing window to stay healthy. East windows get morning light but often fall short of this target. North windows almost never work for mint without supplemental lighting. Check how long direct sunbeams fall on your plant throughout the day.
UMD Extension suggests an interesting trick for indoor mint success. Let your outdoor mint experience a light frost before you bring it inside for winter. This cold exposure triggers a rest period that leads to fresher and stronger new growth once the plant settles indoors. Skip this step and your mint may struggle to adjust.
Grow lights for mint work great when windows fall short of the light target. UMD Extension recommends running lights for 14-16 hours per day to match what outdoor plants get in summer. Position the lights just a few inches above your plant since intensity drops fast as distance increases.
Water your indoor mint less often during winter than you do in summer. Lower light levels mean slower growth which means the plant uses less water. Check soil moisture before each watering and only add water when the top inch feels dry. Overwatering in winter causes root problems since wet soil stays wet longer.
Feed your indoor mint every 6 weeks with a half-strength liquid fertilizer during the growing season. UMN Extension recommends this lighter feeding schedule for indoor herbs. Cut back to no feeding at all during the darkest winter months when growth slows way down.
Indoor air gets dry in winter from heating systems running all day. This low humidity stresses mint leaves and can cause brown crispy edges. Set your pot on a tray of pebbles with water to boost humidity around the plant. Group several plants together since they create a more humid microclimate.
Your year-round indoor mint gives you fresh leaves for cooking whenever you want them. The extra effort of managing light and humidity pays off in fresh harvests through every season. Start with good grow lights and you set yourself up for success no matter how dark winter gets.
Read the full article: How to Grow Mint in Pots: A Complete Guide
