How to grow pineapple mint
Overview
Pineapple mint is a variegated form of Mentha suaveolens grown for its aromatic leaves with a fruity pineapple scent. It is a culinary and ornamental herb that thrives with consistent moisture and part shade.
Varieties
- Pineapple Mint — The standard variegated form with cream-edged leaves and pineapple scent.
- Mentha suaveolens 'Variegata' — The botanical name for the same plant; no distinct cultivars are widely available in AU/NZ.
Soil Preparation
Pineapple mint prefers a pH of 6.0–7.0 in rich, loamy soil with good organic matter. Before planting, work in well-rotted compost or aged manure to improve moisture retention. Ensure the site drains freely to avoid root rot.
Growing Guide
Plant pineapple mint in rich, moist soil in a position that receives morning sun and afternoon shade. Space plants 30–40 cm apart; it spreads vigorously via runners so grow in a container or use a root barrier. Keep soil consistently damp but not waterlogged. In cool climates, mulch heavily to protect roots over winter. Pinch out growing tips regularly to encourage bushy growth.
Sowing
Sow seeds 3 mm deep in seed-raising mix, keeping moist at 18–22°C; germination takes 10–14 days. Direct sow in spring after frost, or start indoors 6 weeks before last frost. Space seedlings 30 cm apart.
Care
Feed monthly with a balanced liquid fertiliser (e.g., seaweed or fish emulsion) during active growth. Prune back to 5 cm in late winter to rejuvenate and remove flower spikes to direct energy into leaf production. Divide clumps every 2–3 years to maintain vigour.
Companion Planting
Pineapple mint pairs well with brassicas (cabbage, broccoli) as its scent can deter aphids and cabbage moths. Avoid planting near chamomile or parsley as mint's aggressive roots may compete. It also benefits from being near tomatoes to improve their flavour.
Common Pests & Risks
Rust (orange pustules on leaf undersides) can occur in humid conditions; remove affected leaves and improve air circulation. Aphids may colonise new growth; blast off with water or apply neem oil. Mint root rot (Phytophthora) appears in waterlogged soil; ensure drainage is adequate.
Harvesting
Harvest leafy stems once the plant reaches 20–30 cm tall, cutting just above a leaf node. Pick regularly to prevent flowering and maintain leaf production. The best flavour comes from fresh young leaves harvested in spring and early summer.
In the Kitchen
Use fresh leaves in salads, fruit salads, teas, or as a garnish for desserts. The pineapple flavour is mild and sweet, ideal for infusing water or cocktails. Store leaves in a damp paper towel in the fridge for up to a week.
Troubleshooting
Yellow leaves: overwatering or poor drainage; reduce watering and improve soil. Brown leaf edges: underwatering or hot sun; move to more shade and increase water. Leggy growth: insufficient light; shift to brighter position. Rust spots: fungal infection; remove affected leaves and avoid overhead watering. Stunted growth: nutrient deficiency; apply balanced fertiliser.