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1. How to grow mint indoors – in soil
This is the most familiar way to grow mint inside. Choose a pot that’s at least 8 inches in diameter and has a drainage hole in the bottom. I like decorative ceramic pots, but plastic works too. Avoid clay pots because they dry out too quickly. Use a high-quality, general potting soil to pot your mint plant, making sure to leave about a half inch of head space between the top of the soil and the rim of the pot. This acts as a reservoir and keeps irrigation water from running off too quickly. Potted mint plants can live for years as houseplants.
2. How to grow mint indoors – in water
Mint can also be grown indoors in water. The main benefit of this method is the lack of soil. No mess, no watering, and never any fungus gnats. However, mint doesn’t live forever in water. Eventually the leaves will yellow and the plant will stop growing. However, keeping a few water-rooted stems in a jar above the sink means you’ll be able to make the occasional harvest. To start growing mint indoors in water, simply take some stem cuttings from a mother plant, remove all the lower leaves, and prop the stems in a glass of water. Change the water and wash the glass every five to seven days. They will quickly develop roots and can be grown in the water-filled jar for a few weeks or months, depending on the growing conditions.
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