Why is My Coriander Bolting? – And How to Prevent It

Coriander, also known as cilantro, is a staple herb in many kitchens around the world. Its distinctive flavor and aroma add a unique taste to a variety of dishes, from soups and stews to salads and salsas. However, coriander can sometimes be a challenge to grow, especially when it bolts, or goes to seed prematurely. Bolting coriander is a common issue faced by gardeners and home cooks alike, but it can be prevented or managed with a few simple tips and tricks.

In this article, we’ll take a look at what causes coriander to bolt, the consequences of bolting, and how to prevent it from happening. Whether you’re a seasoned gardener or just starting to experiment with growing your own herbs, this article will provide you with the information you need to enjoy a bountiful harvest of fresh, flavorful coriander.

What is Coriander?

coriander plants

Coriander (Coriandrum sativum), also known as cilantro or Chinese parsley, is an herb that is widely used in cooking and traditional medicine. It’s native to the Mediterranean region and is now grown and used globally, particularly in Latin American, Asian, and Indian cuisines.

The plant grows to a height of 30–50 cm (12–20 in) and has delicate, feathery leaves that are used both fresh and dried. The leaves have a strong, citrusy flavor and are often used as a garnish or ingredient in soups, sauces, and salads. The seeds of the plant, known as coriander seeds, are also used in cooking and are a staple in spice blends such as curry powder and garam masala.

In traditional medicine, coriander has been used for its medicinal properties for thousands of years. It is believed to have anti-inflammatory, antibacterial, and antifungal properties, and has been used to treat a variety of conditions, from digestive problems and headaches to skin conditions and insomnia.

What is Bolting?

Bolting is a term used in gardening to describe when a plant prematurely produces flowers and seeds instead of leaves and stems. In the case of coriander, bolting occurs when the plant reaches maturity and begins to focus its energy on producing seeds, instead of producing leaves that are used for cooking.

How Can I Tell If My Coriander is Bolting?

bunch of coriander

There are several signs that your coriander is bolting:

  • Tall, spindly stalks: If your coriander is suddenly growing taller and less bushy than usual, it may be a sign that it’s bolting. The plant will produce tall, spindly stalks that bear the seeds.
  • Flowers: If you notice small white or yellow flowers appearing at the top of the stalks, this is another sign that your coriander is bolting. These flowers will eventually produce seeds.
  • Bitter flavor: As the plant begins to bolt, the leaves may start to taste bitter and become tough, making them unsuitable for cooking.
  • Yellowing leaves: Another sign of bolting is yellowing leaves, which may indicate that the plant is no longer producing chlorophyll and is focusing its energy on producing seeds.

If you notice any of these signs, it’s a good idea to remove the bolting coriander and replace it with a new seedling. Bolted coriander won’t produce leaves that are suitable for cooking, so it’s important to catch the problem early and start fresh.

The signs of bolting in coriander include tall, spindly stalks, the appearance of flowers, a bitter flavor in the leaves, and yellowing leaves. If you notice any of these signs, it’s time to remove the plant and start fresh with a new seedling.

Why Does Coriander Bolt?

flowers coriander

There are several factors that can cause coriander to bolt, including:

  • Age: As coriander reaches maturity, it naturally begins to produce seeds. This is a normal part of its life cycle and is not considered bolting. However, if the plant bolts prematurely, it may produce seeds before the leaves have had a chance to reach their full size and flavor.
  • Stress: Environmental stress such as high temperatures, drought, or exposure to high levels of light can cause coriander to bolt. The plant will respond to stress by producing seeds as quickly as possible in order to ensure its survival.
  • Genetics: Some varieties of coriander are more prone to bolting than others. If you’re growing coriander for the first time, consider planting a slow-bolting variety that will produce leaves for a longer period of time.

Can I Eat Bolted Coriander?

Bolted coriander can be eaten, but the leaves will have a less desirable flavor and texture compared to fresh, young leaves of the plant. When coriander bolts, it is reaching maturity and produces seeds, which can cause the leaves to become tough and less palatable. However, the flowers and seeds of the bolted plant are edible and can be used in cooking to add flavor to dishes.

If you want to use coriander primarily for its leaves, it’s best to harvest the plant before it bolts. On the other hand, if you want to use the seeds, it’s best to wait until the plant has flowered and produced seed heads. Whether you decide to use the leaves or seeds, coriander is a versatile herb with many uses in cooking.

How to Stop Coriander from Bolting

bolted coriander

Here are some tips for preventing coriander from bolting:

  • Choose a slow-bolting variety: Some varieties of coriander are more prone to bolting than others. Consider planting a slow-bolting variety, such as ‘Long Standing’, to reduce the likelihood of bolting.
  • Provide consistent moisture: Coriander is sensitive to drought, and stress from drought can trigger bolting. Make sure to keep the soil consistently moist, but not waterlogged, to help prevent the plant from bolting.
  • Grow in cooler temperatures: High temperatures can cause coriander to bolt, so consider growing the plant in a cooler area or planting it during cooler times of the year.
  • Provide adequate spacing: Crowding can cause stress and trigger bolting, so make sure to provide adequate spacing between plants to allow for good air circulation.
  • Trim regularly: Regular pruning and harvesting can help keep the plant healthy and prevent bolting. By removing the top of the plant, you encourage it to produce new leaves instead of focusing on producing seeds.

Preventing coriander from bolting requires a combination of choosing a slow-bolting variety, providing consistent moisture, growing in cooler temperatures, providing adequate spacing, and regular pruning. By following these tips, you can help your coriander produce leaves for a longer period of time and enjoy its fresh, flavorful leaves in your cooking.

Frequently Asked Questions about Coriander

1. Why did my cilantro bolt so fast?

Cilantro bolts quickly due to stress factors such as high temperature, drought, overcrowding, or reaching maturity. Growing cilantro in cooler temperatures, providing consistent moisture, and giving it enough space can help prevent it from bolting.

2. At what temperature does coriander bolt?

Coriander is sensitive to high temperatures and typically bolts when temperatures consistently reach above 80°F. To prevent bolting, it is recommended to grow coriander in cooler temperatures or plant it during cooler times of the year.

3. Why is coriander so difficult to grow?

Coriander can be difficult to grow due to its sensitivity to stress factors such as high temperature, drought, and overcrowding, which can cause it to bolt quickly. In addition, coriander has a short growing season and a quick maturity rate, making it important to plant it at the right time and in the right conditions for successful growth.

4. Why is my coriander flowering?

Coriander flowers when it reaches maturity and begins to bolt. Bolting is a natural process that occurs when the plant focuses its energy on producing seeds instead of leaves. High temperatures, drought, and overcrowding can also trigger bolting in coriander.

5. Can you eat cilantro that has flowered?

Yes, you can eat cilantro that has flowered, but the leaves may be tough and have a less desirable flavor. The flowers and seeds are edible and often used in cooking, but the main focus for using cilantro is the leaves. If your cilantro has bolted, it’s best to harvest the leaves and seeds before the plant goes to seed for the best flavor and quality.

The Take-Away

Coriander bolting is a common problem for gardeners growing this popular herb. Bolting occurs when the plant reaches maturity and focuses its energy on producing seeds instead of leaves, causing the leaves to become tough and inedible. To prevent bolting, it’s important to choose a slow-bolting variety, provide consistent moisture, grow in cooler temperatures, provide adequate spacing, and regularly prune the plant.

By following these tips, you can help ensure that your coriander produces leaves for a longer period of time and enjoy its fresh, flavorful leaves in your cooking. Whether you’re a seasoned gardener or just starting out, understanding the causes of bolting and taking steps to prevent it will help you enjoy a bountiful harvest of this versatile herb.