Are you struggling to figure out how to plant peppermint seeds indoors? Peppermint, a hardy perennial, is a delightful herb that can be started from seed any time of the year. In this article, we provide an easy step-by-step guide that simplifies the process for you.

Keep reading and let’s start your indoor gardening journey together!

Key Takeaways

  • Choose a light, well-draining seed starting mix and sow 1-3 peppermint seeds per container approximately 1/4 inch deep.
  • Water your peppermint seeds from the bottom and cover them with a humidity dome to create an optimal environment for germination.
  • Place your peppermint seedlings in a warm location, provide them with fluorescent grow lights, and water them regularly for healthy growth.
  • Harden off your seedlings before transplanting them outdoors by gradually exposing them to outdoor conditions. When transplanting, ensure adequate spacing and consider using containers to control mint’s rapid spread.

Step-by-Step Guide to Planting Peppermint Seeds Indoors

To plant peppermint seeds indoors, start by preparing a seed starting mix. Fill a container with the starting mix and then plant the peppermint seeds in it. It’s important to water from the bottom and cover the container with a humidity dome to create an ideal growing environment for the seeds.

peppermint plant in a pot

Prepare seed starting mix

Initiating your indoor peppermint growing journey begins with preparing an optimal seed starting mix. Choosing the right soil is essential for successful mint germination as seeds favor light, well-draining, and fertile mixes rich in organic matter.

You can prepare your own by combining three parts compost or peat moss with one part perlite to ensure a loose structure that prevents waterlogging and encourages root growth. Sowing the minuscule pea-sized mint seeds requires careful handling due to their diminutive size; consider soaking them before planting to enhance germination rates.

This step-by-step guide aims at simplifying your indoor peppermint seed starting process, ensuring you cultivate flourishing plants from tiny starters.

Fill container with starting mix

Starting your peppermint garden begins with selecting the right container and filling it appropriately. You want to ensure that it is filled up to approximately an inch below the rim with a quality starting mix.

This ideal blend should consist of two parts compost to one part perlite, providing a healthy medium for your seeds. This mix will create optimal conditions for growth by aiding in moisture retention while still enabling proper drainage.

In anticipation of successful germination, sow 1-3 peppermint seeds on top of this carefully prepared mix. The use of three seeds per container significantly increases your chances of success, ensuring at least one seed sprouts into a thriving mint plant.

It’s essential to place this setup in a well-lit area indoors as mint seeds require light exposure during their critical germination phase.

Plant the peppermint seeds

Embarking on your indoor gardening adventure starts with careful planting of peppermint seeds. Using a high-quality seed starting mix, you’ll want to sow these tiny powerhouses about 1/4 inch deep into the soil, giving them just enough coverage without stifling their potential growth.

With ideal soil conditions mimicking their native habitat, your mint seeds are poised for success. Make sure not to soak the seeds before planting; it’s actually unnecessary in this case and can even hinder germination.

Within about 7-14 days, under consistent moisture and favorable conditions, expect these resilient seeds to burst through the soil surface and make their first appearance. Growing peppermint indoors offers versatility and ease as long as you stick to the step-by-step guide provided herein.

Water from the bottom and cover with a humidity dome

To give your peppermint seeds the best chance of germinating and sprouting indoors, it’s important to water them from the bottom and cover them with a humidity dome. By watering from the bottom, you ensure that the soil remains consistently moist without disturbing the delicate seeds.

Simply place your seed tray or container in a shallow dish filled with water, allowing the soil to soak up moisture from below.

Covering your peppermint seeds with a humidity dome or plastic bag is another crucial step for successful germination. This creates a microclimate that traps in moisture and creates an optimal environment for growth.

The trapped humidity mimics the conditions found in nature, encouraging faster and more uniform germination.

Read More: How To Plant Strawberry Seeds Indoors

Caring for Peppermint Seedlings

To ensure healthy growth, place your peppermint seedlings in a warm location and provide them with fluorescent grow lights. Regular watering is essential for their development. Curious to learn more about caring for these aromatic plants? Keep reading!

Place in a warm location

To ensure the optimal growth of your peppermint seedlings, it’s essential to place them in a warm location. Peppermint thrives in warm climates, so finding a spot with a consistent temperature is crucial.

Aim for an optimum temperature range of 55 to 72°F when sowing peppermint seeds indoors. This helps create the ideal conditions for germination and seedling growth.

When choosing a location, consider areas that receive plenty of sunlight or near a heat source like a sunny windowsill or heating pad. Avoid drafty areas as they can cause fluctuations in temperature that may harm the delicate seedlings.

By providing warmth from the start, you’re giving your peppermint seeds the best chance to grow into healthy and vibrant plants.

Provide fluorescent grow lights

To ensure the healthy growth of your peppermint seedlings when planting them indoors, it is important to provide them with fluorescent grow lights. These lights are specifically designed to mimic sunlight and give your plants the necessary light spectrum for optimal development.

Using artificial lighting is especially crucial during the winter months when natural sunlight may be limited. Fluorescent lights should be on for at least 12 hours a day to promote proper growth.

Investing in grow lights with timers can make managing the lighting schedule a breeze. By providing your peppermint seedlings with fluorescent grow lights, you can significantly improve their germination rates and overall survival, ensuring a bountiful supply of this versatile herb for your indoor garden.

Water regularly

Proper watering is crucial for the health and growth of your indoor peppermint plants. Peppermint plants have a high water requirement, so it’s essential to keep the soil evenly moist.

Aim to provide around 1 to 2 inches of water per week during the growing season. To achieve this, water your peppermint seedlings every two or three days, adjusting the frequency based on their exposure to sunlight.

Be mindful not to over-water or under-water them, as both can negatively impact their development. For potted mint plants, water them 2-3 times a week and increase the frequency if you notice the top layer of soil becoming too dry.

See also: How To Plant Mandevilla Seeds , How To Plant Luffa Seeds

Transplanting Peppermint Seedlings

To transplant your peppermint seedlings, begin by hardening them off outdoors for a few days. Then, carefully remove the seedlings from their containers or trays and gently separate any tangled roots.

Dig holes in your garden or larger containers that are deep enough to accommodate the roots without bending them. Place each seedling in its hole and cover with soil, firming it gently around the base of the plant.

Water thoroughly after transplanting to help settle the soil and ensure proper hydration for the young plants.

Harden off the seedlings

Harden off the seedlings is a crucial step in successfully transplanting your peppermint seedlings into the garden. This process involves acclimating them to outdoor conditions gradually, ensuring their survival and ability to thrive.

To harden off your seedlings, follow specific guidelines that help them adjust to their new environment smoothly. Start by placing them outside for a few hours each day, gradually increasing the duration over a week or two.

Protect them from direct sunlight and strong winds initially, then expose them more fully as they become stronger. It’s important to avoid transplanting your mint seedlings directly from the greenhouse without hardening them off first.

Transplant into the garden or larger containers

After successfully planting and caring for your peppermint seeds indoors, it’s finally time to give them their new home in the garden or a larger container. Transplanting peppermint seedlings is an exciting step that allows your plants to thrive and spread their aromatic leaves.

Whether you have limited space or want to control the growth, you can choose between transplanting into the garden or using larger containers.

When transplanting peppermint seedlings, make sure to provide enough space for them to grow by spacing them 18 to 24 inches apart. This ensures adequate airflow and prevents overcrowding.

If you opt for containers, select ones that are at least 12 inches deep and wide enough for roots to spread out comfortably.

Remember that while mint is easy to grow, it can quickly take over if not contained properly. So keep an eye on its growth and consider using barriers like edging or burying pots in the ground when planting mint directly in the garden.


1. Can I plant peppermint seeds indoors year-round?

Peppermint seeds can be planted indoors year-round as long as you provide the necessary conditions such as a warm temperature, adequate sunlight, and proper watering.

2. How deep should I plant peppermint seeds?

Peppermint seeds should be planted about ⅛ to ¼ inch deep in well-draining soil, ensuring they are covered with a thin layer of soil for optimal growth.

3. How often should I water peppermint seeds when growing them indoors?

It is essential to keep the soil consistently moist but not overly saturated when growing peppermint seeds indoors. Watering once or twice a week or whenever the top inch of soil feels dry is generally recommended.

4. How long does it take for peppermint seeds to germinate indoors?

Peppermint seeds typically take around 10 to 15 days to germinate when grown indoors under ideal conditions. However, it’s important to note that germination time can vary depending on factors like temperature and humidity levels in your indoor environment.

George Brown

George Brown

I’m George Brown, a keen indoor gardener, passionate about helping beginners grow fresh herbs and indoor plants. My guidance focuses on the essentials of plant growth and the pleasure of cultivating greenery indoors. In my blog posts, I share practical tips on how anyone can transform their home into a thriving space for indoor plants and herbs.

Click to rate this post!
[Total: 1 Average: 5]