Growing cilantro (Coriandrum sativum) in New Hampshire can be a rewarding endeavor for both novice and experienced gardeners. Known for its distinctive flavor and aroma, cilantro is a popular herb used in various culinary dishes. With the right approach, you can successfully cultivate this versatile herb even in the northeastern United States. This article will guide you through the essential steps and considerations for growing cilantro in New Hampshire.
Cilantro, also known as coriander, is an annual herb that thrives in cooler temperatures. It has distinctive feathery leaves and produces small white or pink flowers, which can later develop into coriander seeds. Both the leaves and seeds are widely used in cooking, making it a valuable addition to any garden.
New Hampshire experiences a varied climate with cold winters and warm summers. Cilantro prefers cool weather and grows best in temperatures between 50°F to 85°F. In the spring and fall, conditions are generally favorable for growing cilantro, while the summer months can be too hot, often leading to premature bolting (when the plant flowers and goes to seed).
Cilantro thrives in well-draining soil rich in organic matter. It prefers slightly acidic to neutral pH levels (around 6.0 to 7.0). To improve soil quality, consider mixing compost or well-rotted manure into your garden bed before planting. This will provide essential nutrients and enhance soil structure, ensuring good drainage.
Cilantro grows best with full sun exposure, ideally receiving at least 6 hours of direct sunlight each day. However, during the hottest months, providing some afternoon shade can help prevent bolting.
While there are several varieties of cilantro available, most gardeners opt for the standard ‘Santo’ variety due to its adaptability and robust flavor. You may also encounter varieties like ‘Calypso’ or ‘Leisure,’ which are bred for specific growing conditions or pest resistance. When selecting your seeds or transplants, ensure they are suited for your local climate.
In New Hampshire, cilantro should be planted in early spring after the last frost date (typically around mid-April) or in late summer for a fall harvest (usually late August). This timing allows you to take advantage of cooler temperatures that promote healthy growth.
Seed Preparation: If using seeds, soak them in water for several hours prior to planting. This process can help enhance germination rates.
Direct Seeding: Sow seeds directly into the garden bed about ¼ inch deep and spaced 1-2 inches apart in rows that are 12-18 inches apart.
Transplanting: If opting for transplants, start indoors 4-6 weeks before the last frost date. Use biodegradable pots to minimize root disturbance when transplanting outdoors.
Watering: After planting, water the area gently but thoroughly to avoid displacing the seeds.
Regular watering is crucial for cilantro growth. The soil should remain consistently moist but not waterlogged. Water deeply once or twice a week, depending on rainfall and temperature conditions.
Cilantro isn’t particularly heavy feeding; however, a light application of balanced fertilizer (10-10-10 NPK) during planting can promote vigorous growth. If your soil is nutrient-rich due to compost amendments, additional fertilization may not be necessary.
Weed control is important as cilantro competes poorly against weeds for nutrients and moisture. Regularly check your garden bed and remove weeds by hand or use mulch around your plants to suppress weed growth effectively.
Cilantro can attract pests such as aphids and spider mites. Monitor your plants regularly and use organic methods such as insecticidal soap or neem oil if infestations occur. Companion planting with marigolds or basil can deter pests naturally.
One of the biggest challenges when growing cilantro is its tendency to bolt as temperatures rise. Here are some tips to manage bolting:
Select Appropriate Varieties: Choose bolt-resistant varieties if available.
Timing: Plant during cooler seasons—early spring or late summer—to avoid hot weather.
Shade: Provide afternoon shade during particularly hot days to keep plants cool.
Succession Planting: To ensure a continuous harvest, sow seeds every few weeks throughout the growing season.
Cilantro can be harvested once it reaches about 6 inches tall—typically within 3-4 weeks of planting. Here’s how to do it properly:
Leaf Harvesting: Trim leaves from the top of the plant using scissors or garden shears, taking care not to remove more than one-third of the plant at once.
Seed Harvesting: If you allow some plants to flower and seed after leaf harvest, collect coriander seeds once they turn brown and dry on the plant.
If you wish to save coriander seeds for future planting:
Cut entire seed heads when they are brown.
Place them in a paper bag in a dry location until fully dried.
Once dried, shake the bag gently to release seeds from their husks.
Fresh cilantro can be stored in several ways:
Refrigeration: Place fresh cut stems upright in a jar with water—like a bouquet—and cover lightly with a plastic bag.
Freezing: Chop leaves and mix with water or olive oil; freeze them in ice cube trays for convenient use later.
Drying: Dried cilantro loses its flavor but can be stored in an airtight container away from light.
Growing cilantro in New Hampshire involves understanding its specific needs regarding climate, soil type, sunlight exposure, and watering practices. By following these guidelines—selecting appropriate planting times, managing pests effectively, and knowing when to harvest—you can successfully enjoy fresh cilantro from your garden throughout much of the year. Its unique flavor will enhance countless dishes while providing you with a fulfilling gardening experience!