Most herbs will survive winter inside your home with the right care adjustments in place. Overwintering herbs in pots works well for rosemary, thyme, oregano, and mint. You just need to help your plants adapt to the lower light and drier air they face during cold months.
I tested this myself by keeping herbs alive winter after winter in my apartment. My rosemary and thyme made it through three cold seasons without any major problems. The key was placing them near a cool window away from my heating vents. I found a spot with good light but temperatures around 50°F to 60°F (10°C to 15°C) at night.
Winter changes how your herbs grow in several ways you need to know about. Shorter days mean less light energy for your plants to use each day. The heated air in your home pulls moisture from leaves faster than in summer months. Your herbs respond by slowing down their growth rate and needing less water and food. This is normal behavior and not a sign of trouble.
Some herbs survive winter indoors better after a brief cold snap outside first. Mint, chives, and tarragon benefit from light frost before you bring them in. This cold period triggers the plants to prepare for a rest phase. They wake up stronger in spring after this natural rest cycle ends.
The secret to keeping herbs alive in winter means changing how you water them quite a bit. Cut your watering back by 30 to 50% from what you gave them in summer months. Check the soil with your finger before adding water each time. The top inch needs to feel dry before you water again. Wet soil in winter leads to root rot faster than any other time of year.
Dry indoor air causes problems for many herbs during heating season in your home. Place a small tray with pebbles and water under your pots to add moisture around your plants. The water evaporates and raises humidity right where your herbs need it most. Just make sure your pot sits on the pebbles above the water line so the roots stay dry.
Keep your herbs away from heat vents and cold drafts that create stress for your plants. Hot air from your furnace dries out leaves fast and can burn the edges of your plants. Cold air from doors and windows shocks your herbs and causes leaf drop overnight. In my experience, a stable spot helps a lot for winter success.
Different herbs need different winter care from you based on where they come from. Rosemary and thyme prefer cooler temperatures and drier soil than most herbs do. Basil needs more warmth and struggles below 60°F (15°C) even indoors. Mint and chives are the toughest and bounce back from almost any treatment over winter.
Your overwintered herbs may look tired by late winter and that is normal behavior for them. They may drop some leaves and grow slowly until spring arrives with more light. Give them a light trim and a dose of fertilizer once daylight increases in March. Most plants bounce back fast once growing conditions improve again. The effort pays off when you have established plants ready to harvest in spring.
Read the full article: Growing Herbs Indoors: Complete Guide
