BLog

There’s something magical about snipping fresh basil for pasta or pinching mint for tea. Homegrown herb gardening transforms your cooking — fresh flavors that grocery store herbs can’t match. It fills your home with delightful fragrances. And it adds a touch of living green to your space that reminds you that growth happens everywhere, even on a windowsill.

But growing herbs indoors is different from growing them outdoors. Minnesota’s climate, indoor light, and heating systems all require a slightly different approach. Here’s how to grow herbs successfully and harvest them for the best results.

1. Sun: The Most Important Factor

Herbs are sun-lovers. They thrive in bright, sunny locations and struggle in low-light conditions. This is non-negotiable for both indoors and outdoor herbs.

Why sunlight matters:
Sunlight stimulates leaf production — the more sun, the bushier and more flavorful your herbs. Sunlight also helps dry damp foliage, preventing fungal diseases like powdery mildew.

How much light do herbs need?
Most herbs need 6–8 hours of direct sunlight daily. A south-facing or west-facing patio or window is ideal for containers. If your home doesn’t have that much natural light, consider a grow light. Even a simple LED grow light positioned 6 inches above plants can make a huge difference.

Location tips

• Place herbs in your sunniest spot
• Rotate potted herbs weekly so all sides get equal light
• Keep herbs away from cold drafts (windowsills in winter can be surprisingly cold)

2. Heat: Minnesota’s Challenge

In warmer climates, heat-loving herbs like basil grow year-round as perennials. Here in Minnesota, we need to create warmth for these tropical plants. Basil, for instance, can’t tolerate temperatures below 55°F. It will sulk, stop growing, and eventually die if exposed to cold.

Heat-sensitive herbs

• Basil (frost-sensitive, needs 70°F+)
• Cilantro (prefers 60–70°F)
• Lemongrass (tropical, needs warmth)
• Mint (tolerates cooler temps but prefers 65°F+)

If you’re buying early in the season

Plan A: Bring plants indoors during cold snaps
If you’ve planted herbs outdoors, monitor the forecast. When temperatures drop below 55°F at night, bring pots inside to a sunny window. Once the threat passes, move them back out. This works for spring and fall.

Plan B: Protect with fabric
Cover plants outdoors with a light cotton cloth or frost blanket for insulation. This works for brief cold snaps but isn’t a long-term solution.

Better Plan C: Start indoors and move outside
For summer herbs like basil, start them indoors as seeds in spring. Once nighttime temperatures stay above 60°F (usually mid-May in the Twin Cities), move them outside. Bring them back in before the first frost in fall.

Winter indoors:
Most herbs can live on a sunny windowsill through winter, but growth slows significantly. Expect smaller harvests. Provide supplemental lighting if your windows don’t get 6+ hours of direct sun.

3. Water: The Balance

Keeping herbs hydrated in well-draining soil is essential. But overwatering is the #1 reason herb gardens fail.

The watering rule:
Water when the top inch of soil feels dry to the touch. In summer, this might mean daily. In winter, it might be every 3–4 days. Check soil before watering — don’t water on a schedule.

How to water properly

• Water at the soil level, never on the foliage
• Wet leaves can lead to fungal disease and rot
• Water early in the morning so any splash dries quickly
• Use room-temperature water (cold water can shock roots)
• Ensure pots have drainage holes — waterlogged soil kills herbs faster than anything

Exceptions:
Mint and lemon balm can tolerate wetter conditions and actually prefer consistently moist soil. Most other herbs prefer drier conditions between waterings.

Humidity consideration:
Indoor heating systems dry out the air in winter. Herbs appreciate some humidity. Group pots together, place them on a pebble tray with water (don’t let pots sit in water), or mist occasionally to increase humidity around the plants.

4. Harvesting: How to Get the Most from Your Herbs

This is where the magic happens — actually using your herbs. The way you harvest directly impacts how full and productive your plants become.

The harvesting rule:
Pinch or snip stems, not just leaves. Remove stems from the top down, working your way around the plant. This encourages bushier growth and prevents leggy, sparse plants.

How to harvest correctly

For leafy herbs (basil, mint, oregano, thyme):

• Pinch off the top 2–4 inches of stems using your fingers or small scissors
• Always harvest from the top of the plant, working downward
• Remove leaf pairs or clusters at a time
• The plant will branch at the point where you pinched, creating two new stems
• More stems = fuller, bushier plant = more leaves to harvest

Example: If you pinch basil at the top, two new shoots will emerge from that node. Pinch those when they’re a few inches tall, and you get four shoots. This exponential branching creates an incredibly full, productive plant.

For herbs with a central stem (dill, fennel, cilantro):

• Cut outer stems first, leaving inner growth intact
• Cut about 1/3 of the plant at a time
• This allows the center to keep growing while you harvest outer stems

Harvesting frequency:
Pinch or harvest frequently — every few days if possible. The more you harvest, the bushier and more flavorful your herbs become. Frequent harvesting also prevents flowering, which is important because once herbs flower, they stop producing new leaves.

When NOT to harvest:
Don’t harvest more than 1/3 of the plant at a time. This keeps the plant strong and prevents shock. New, young plants (less than 6 weeks old) should be barely harvested — let them establish first.

Best time to harvest:
Morning, after dew has dried but before the day heats up. Herbs are most flavorful and hydrated in early morning.

5. Feeding: Organic Fertilizer

Water keeps plants alive, but fertilizer makes them thrive — especially for herbs destined for your plate.

Why fertilize herbs:
Indoor herbs in containers are more dependent on nutrients than garden-grown herbs. As you harvest, you’re removing nutrients. Fertilizer replenishes those.

Best fertilizer for culinary herbs:
Use organic, balanced fertilizer (10-10-10 or similar). Avoid synthetic fertilizers with harsh chemicals. For herbs you’ll eat, organic matters.

Fertilizing schedule

• Every 2–4 weeks during growing season (spring/summer)
• Every 4–6 weeks during winter (slower growth)
• Follow package instructions for dilution rates
• Less is more — overfertilizing can make herbs less flavorful

Common Problems & Solutions

• Yellow leaves: Usually overwatering or poor drainage. Check soil moisture and ensure pots have drainage holes.
• Leggy, sparse growth: Not enough light or not harvesting frequently enough. Move to a sunnier window or under a grow light. Pinch more often.
• Brown leaf tips: Low humidity or mineral buildup in water. Increase humidity, use distilled water occasionally, or ensure good air circulation.

From Windowsill to Table

The best part about growing herbs isn’t just the fresh flavors (though that’s incredible). It’s the ritual of caring for your plants, using it in cooking, and having what you need within arm’s reach. It also is a powerful way to connect you to your food and the world around us.
Bonus points: they’re great bug-repellent plants for the patio.

Start with one or two herbs you actually use — basil if you love pasta, mint for tea, cilantro for tacos. Master those, then expand. Soon your kitchen window becomes a productive little herb garden that makes every meal taste better.

Visit Sunnyside Gardens to pick up fresh herb starts or our ready-to-go variety pots for an instant indoor herb garden. Our team can help you choose herbs for your cooking style and answer any questions about keeping them thriving.