How to grow culantro
Overview
Culantro (Eryngium foetidum) is a tropical perennial herb grown for its intensely flavoured leaves, which are used like a stronger, more resilient coriander. It thrives in warm, humid conditions with part shade and consistent moisture, and is valued for providing a steady harvest over many months.
Soil Preparation
Culantro prefers a rich, loamy soil with a pH between 6.0 and 7.0. Before planting, dig in plenty of well-rotted compost or aged manure to improve fertility and moisture retention. Ensure the soil drains well; if it is heavy clay, raise the bed or add sand and organic matter to improve drainage.
Growing Guide
Plant culantro in a position that receives morning sun but is shaded from harsh afternoon heat, such as under a tree or on the east side of a building. Space plants 30-40 cm apart in rich, well-draining soil amended with compost. For best leaf production, keep the soil consistently moist but not waterlogged; a thick layer of organic mulch helps retain moisture and keep roots cool. In subtropical and tropical climates, it can be planted year-round, but avoid the coolest months of the dry season in the tropics.
Sowing
Sow culantro seeds directly into the garden or into seed trays at a depth of 5 mm, spacing them 20 cm apart. Seeds germinate in 14-21 days in warm, moist conditions. For best results, soak seeds in warm water for 24 hours before sowing to improve germination. Transplant seedlings when they are 10 cm tall.
Care
Feed culantro monthly during active growth with a balanced liquid fertiliser, such as seaweed or fish emulsion. Remove any flower stalks that appear to prolong leaf production and prevent the plant from going to seed. Prune away any yellow or damaged leaves to keep the plant tidy and encourage fresh growth.
Companion Planting
Culantro grows well with other shade-tolerant herbs like mint, Vietnamese mint, and turmeric. It can also be planted near leafy greens such as amaranth and sweet potato. Avoid planting near fennel, which may cross-pollinate and reduce leaf quality, or in the same bed as heavy feeders that compete for moisture.
Common Pests & Risks
Aphids are the most common pest on culantro, especially on new growth; spray them off with a strong jet of water or use neem oil. Slugs and snails may damage leaves at night; control with beer traps or crushed eggshells around the base. In humid conditions, watch for fungal leaf spot; improve air circulation by spacing plants well.
Harvesting
Harvest culantro leaves from the outside of the plant when they are 15-20 cm long, cutting at the base with scissors. Regular harvesting encourages new growth and prevents the plant from bolting. For the best flavour, pick leaves in the morning before the heat of the day.
In the Kitchen
Culantro leaves have a strong, coriander-like flavour that holds up well in cooking; use them fresh in salads, salsas, and curries, or add them to soups and stews at the end of cooking. The leaves can be stored in a plastic bag in the refrigerator for up to a week, or frozen in ice cube trays for longer use. Unlike coriander, culantro does not lose its flavour when heated.
Troubleshooting
Yellow leaves: caused by overwatering or poor drainage; let the soil dry out slightly between waterings. Brown leaf edges: caused by too much direct sun or dry air; move to a shadier spot or increase humidity. Bolting: caused by stress from heat or drought; keep soil consistently moist and remove flower stalks as soon as they appear. Slow growth: caused by cold temperatures; wait for warm weather or grow in a protected spot. Leaf drop: caused by heavy rain or waterlogging; improve drainage or plant in a raised bed.