How To Grow Basil Indoors During Winter

You can grow basil indoors during winter with just a little planning and the right setup.

It’s completely doable, even if you don’t have a green thumb or a sunny windowsill.

If you’ve been wondering how to grow basil indoors during winter, the good news is that basil is one of the easiest herbs to keep alive inside when the temperatures drop.

In this post, we’ll walk you through how to grow basil indoors during winter, from lighting and watering to harvesting and common mistakes.

Let’s dig in.
 

Why You Can Grow Basil Indoors During Winter

Growing basil indoors during winter works because basil doesn’t actually need outdoor soil or summer heat to thrive.

It just needs consistent warmth, bright light, and a steady watering routine.

When you grow basil indoors during winter, you’re essentially recreating the Mediterranean conditions basil loves, just on a windowsill or under a grow light.

Basil is a fast-growing annual, so if you give it the basics, it will reward you with fresh leaves all season long.

Indoor basil won’t grow as fast as it does in July, but it will absolutely grow.

You can grow basil indoors during winter by starting from seed, transplanting a small plant from your garden, or even rooting a grocery store cutting in water.

All of these methods work, and we’ll cover each one below.
 

1. Start With the Right Basil Variety

Not all basil is created equal when it comes to winter growing.

If you’ve been thinking about how to grow basil indoors during winter, choose compact varieties like Genovese, Sweet Basil, or even Thai basil.

These varieties stay smaller and are more forgiving indoors.

Avoid giant bush basil or types that are bred for outdoor sprawling.

A compact plant will fit better in a pot and won’t outgrow your space too fast.

You can also buy a small basil plant from a nursery, which gives you a head start.

Just make sure it looks healthy and hasn’t been stressed by cold drafts during transport.
 

2. Give Basil the Brightest Spot Possible

The biggest challenge when you grow basil indoors during winter is light.

Winter days are short, and even a bright south-facing window might not give basil the 6 to 8 hours of direct sun it craves.

If you have a south-facing window, place your pot right on the sill, but don’t let the leaves touch the cold glass.

If you don’t have enough natural light, use a grow light.

A simple LED grow light placed a few inches above the plant works wonders.

Keep it on for 12 to 14 hours a day to mimic summer daylight.

This is honestly the secret to how to grow basil indoors during winter successfully.

Without enough light, basil gets leggy, pale, and weak.

With good light, it stays bushy and flavorful.
 

3. Mind the Temperature and Humidity

Basil hates cold drafts and sudden temperature swings.

To grow basil indoors during winter, keep it away from drafty windows, doors, and heat vents.

The ideal temperature is between 65°F and 75°F (18°C to 24°C).

That’s just normal room temperature for most homes.

Humidity is also important because winter air can get dry, especially if you use central heating.

Dry air makes basil leaves curl and crisp at the edges.

You can fix this by misting your basil leaves lightly every couple of days.

Or place a small bowl of water next to the pot to add some moisture to the air.

Just don’t mist so much that the soil stays wet, that will cause root rot.
 

The Best Ways to Grow Basil Indoors During Winter

There are a few different routes you can take, and each one has its pros and cons.

Here’s how to grow basil indoors during winter depending on what you have on hand.
 

1. Growing Basil From Seeds

Seeds are the cheapest way to grow basil indoors during winter, but they take patience.

Sow seeds about 1/4 inch deep in good potting mix.

Keep the soil moist but not soggy, and cover the pot with plastic wrap until seeds sprout.

Once seedlings have two sets of true leaves, thin them out so each plant has room to grow.

Seeds take about 2 to 3 weeks to sprout and another few weeks to be harvestable.

It’s a longer process, but it’s very satisfying to watch.
 

2. Rooting a Cutting in Water

If you have a basil plant outside or you grab a fresh bunch from the grocery store, this is a fast method.

Take a 4-inch cutting from a healthy stem, remove the lower leaves, and place it in a glass of water.

Put the glass in a bright spot and change the water every couple of days.

Within a week or two, roots will appear.

Then transplant the cutting into soil.

This is hands down the easiest way to grow basil indoors during winter if you’re in a hurry.
 

3. Transplanting an Outdoor Plant

Before the first frost hits, you can dig up a small basil plant from your garden and bring it inside.

Try to take as much root ball as possible.

Repot it into a clean pot with fresh potting soil.

Expect the plant to go through a little shock for the first week.

Trim back some leaves to reduce stress, and keep it well watered.

With a grow light, this outdoor basil can keep producing for months indoors.
 

Watering and Feeding Basil in Winter

Getting the watering right is a big part of how to grow basil indoors during winter.

Basil likes consistent moisture but absolutely hates sitting in water.

Always check the top inch of soil before watering.

If it feels dry to the touch, water slowly until it runs out the bottom drain holes.

If it still feels damp, wait another day or two.

In winter, indoor basil needs less water than it does in summer because growth slows down.

Overwatering is the number one killer of indoor basil, so be careful.

As for feeding, use a diluted liquid fertilizer every 3 to 4 weeks.

A balanced indoor plant food at half strength works great.

Don’t over-fertilize because that can make leaves taste bitter.
 

Harvesting Basil So It Keeps Growing

When you grow basil indoors during winter, the way you harvest determines whether your plant thrives or fades.

Never pull off single leaves from the bottom, that will weaken the plant.

Instead, pinch or cut the stems just above a pair of leaves.

This encourages the plant to branch out and grow bushier.

Always leave at least two sets of leaves on the stem.

And if you see flower buds forming, pinch them off immediately.

Flowers signal the plant to stop producing leaves and start making seeds.

Keeping the flowers removed means you’ll have a steady supply of fresh basil all winter.
 

So, How Do You Grow Basil Indoors During Winter?

You can absolutely grow basil indoors during winter by giving it plenty of light, keeping it warm, and watering it just right.

It’s not complicated, but it does require a bit of attention.

Whether you start from seed, root a cutting, or bring in an outdoor plant, the process is the same.

Bright light, consistent warmth, and careful watering are the three pillars of success.

With these tips, you’ll have fresh, aromatic basil for your winter soups, pastas, and sauces.

So don’t let the snow stop you from enjoying homegrown herbs.

Grab a pot, some seeds, and get started today.

Your kitchen will thank you.