Spearmint

The classic mint for tea with a sweeter, less menthol-intense flavor than peppermint, essential for Moroccan mint tea and Middle Eastern cuisine. Spearmint's gentle flavor makes it the preferred variety for culinary use in sauces, salads, and fresh spring rolls. Contain in pots and harvest frequently, as the vigorous runners will colonize any available ground.

While spearmint can be grown from seed, division and cuttings are far easier and more reliable. Seeds are tiny and germination is erratic—sow on the surface of moist compost without covering, at 18-22°C. Keep consistently moist and expect germination in 10-15 days. Seedlings grow slowly and may not come true to type. For the fastest results, divide established plants in spring or autumn by cutting sections of runner with roots attached—these establish almost instantly. Stem cuttings root readily in water in just 5-7 days and can then be potted up or planted out.

Spearmint is one of the world's most popular and widely cultivated herbs, grown on every continent for its sweet, fresh flavor that is milder and more versatile than peppermint. A vigorous perennial growing 30-90cm tall with bright green, serrated leaves and whorls of pink or lilac flowers in summer, spearmint is virtually indestructible once established. Its spreading stolons make it both a blessing and a challenge in the garden.

Grow spearmint in partial to full sun in moist, fertile soil. It is one of the few herbs that thrives in damp conditions and partial shade, making it ideal for spots where other herbs would struggle. The most important cultivation consideration is containment—spearmint spreads aggressively by underground runners and will quickly colonize entire beds if not controlled. Plant in a large pot sunk into the ground with the rim 3cm above soil level, or grow in freestanding containers.

Harvest frequently and hard to encourage continuous fresh growth and prevent the plant from becoming woody and sparse at the base. Cut stems back by two-thirds regularly throughout the growing season. In winter, the plant dies back to ground level and resprouts vigorously in spring. Divide congested clumps every 2-3 years to maintain vigor and prevent the center from dying out.

Spearmint is a beneficial companion for tomatoes, cabbage, and peas, as its strong scent helps deter aphids, flea beetles, and cabbage moths. However, it must be contained to prevent it from overwhelming neighboring plants. Plant potted spearmint among vegetable beds for pest deterrence without the risk of invasion. Spearmint attracts hoverflies and other beneficial insects whose larvae consume aphids. Avoid planting near parsley and chamomile, which are reported to have negative interactions with mint. The strong fragrance of spearmint planted near doorways also helps repel ants and flies.

Spearmint is undemanding about soil and grows in virtually any fertile, moist garden soil with a pH of 6.0-7.5. It performs best in rich, moisture-retentive soil with plenty of organic matter. Unlike most herbs, spearmint does not require sharp drainage and actually prefers consistently moist conditions. Incorporate compost before planting and top-dress with compost or aged manure annually in spring. Feed container plants fortnightly with a balanced liquid fertilizer during the growing season. Spearmint in poor soil produces smaller, less flavorful leaves.

Ideal Temperature

Hardiness Zone Compatibility

Harvest spearmint leaves and stem tips continuously from spring through autumn. The most flavorful harvest comes just before the plant flowers, when essential oil content is highest. Cut stems to about 5cm above ground level for major harvests, or pick individual leaves and sprigs as needed for daily use. Morning harvesting after dew has dried yields the best flavor. Spearmint recovers quickly from heavy harvesting and will produce 3-4 major cuts per growing season in productive conditions. Remove flower buds as they appear to prolong leafy growth.

Storage & Preservation

Fresh spearmint keeps for up to a week with stems in a glass of water on the kitchen counter or wrapped in a damp paper towel in the refrigerator. For long-term storage, dry stems by hanging in bunches in a warm, dark, well-ventilated room for 5-7 days. Strip dried leaves from stems and store in airtight glass jars—dried spearmint retains good flavor for 12-18 months. Spearmint also freezes well: chop leaves and freeze in ice cube trays with water or olive oil for convenient cooking portions. Leaves can be preserved in sugar, vinegar, or as a simple syrup for beverages.

Troubleshooting Common Problems

The number one problem with spearmint is its invasive spreading through underground stolons—it can take over entire garden beds within a single season. Always contain in pots or use root barriers. Mint rust is the most serious disease; treat by cutting all growth to the ground and destroying infected material. Woody, sparse plants with poor flavor result from infrequent harvesting—cut hard and often to maintain vigorous young growth. In very hot climates, spearmint may struggle in full sun; provide afternoon shade and extra moisture. Flea beetles can riddle leaves with tiny holes in spring.

Growing Tips

1. Always grow spearmint in containers or behind buried root barriers at least 30 cm deep to prevent its aggressive stolons from taking over neighboring garden beds.
2. Harvest by cutting stems just above a leaf node, which stimulates two new branches to sprout from that point and results in a bushier, more productive plant.
3. Provide partial shade for the best leaf flavor and aroma. Full sun is tolerated but can cause leaves to become tough and less fragrant, especially in hot climates.
4. Keep soil consistently moist but never waterlogged. Spearmint is one of the few herbs that actually prefers higher moisture levels than most culinary herbs.
5. Propagate effortlessly by placing 10-15 cm stem cuttings in a jar of water on a windowsill. Healthy roots will develop within one to two weeks.
6. Cut the entire plant back to about 5 cm above soil level two or three times per season to force vigorous flushes of tender, highly aromatic new foliage.
7. Watch for mint rust, visible as small orange pustules on leaf undersides. Remove affected stems immediately and avoid wetting the foliage when watering to prevent spread.
8. Keep different mint varieties in separate containers at least one meter apart to prevent cross-pollination, which can produce offspring with unpredictable and often inferior flavors.
9. Rejuvenate container-grown spearmint every two to three years by dividing the root mass, discarding the woody center portion, and replanting vigorous outer sections in fresh potting mix.
10. Preserve the harvest by freezing whole leaves in ice cube trays topped with water or olive oil, or by hanging small bundles upside down in a warm, airy spot to dry.