What To Know
- The heat can cause the plant to bolt, meaning it will quickly flower and go to seed, resulting in bitter leaves and a shorter harvest.
- With the right techniques, you can still enjoy a bountiful crop of coriander even in the most scorching summer months.
- In hot climates, it’s best to sow coriander seeds in the early spring or late summer/early fall when temperatures are cooler.
Coriander, with its fresh, bright flavor, is a staple in many cuisines. But when the temperatures soar, growing this delicate herb can feel like an uphill battle. The heat can cause the plant to bolt, meaning it will quickly flower and go to seed, resulting in bitter leaves and a shorter harvest. But don’t despair! With the right techniques, you can still enjoy a bountiful crop of coriander even in the most scorching summer months.
Understanding Coriander’s Needs
Coriander thrives in cool weather, making hot weather a challenge. Here’s what you need to know about coriander’s preferences:
- Temperature: Ideal temperatures for coriander growth are between 60-70°F (15-21°C). High temperatures, especially above 80°F (27°C), can trigger bolting.
- Sunlight: Coriander prefers full sun, but in hot weather, it’s best to provide some shade, particularly during the hottest part of the day.
- Moisture: Coriander needs consistently moist soil, but avoid overwatering, which can lead to root rot.
- Soil: Coriander prefers loose, well-draining soil rich in organic matter.
Choosing the Right Variety
Not all coriander varieties are created equal when it comes to heat tolerance. Here are some tips for selecting the right variety:
- Look for heat-tolerant varieties: Some varieties, such as ‘Long Standing’ and ‘Santo’, are known for their ability to withstand warmer temperatures.
- Consider planting in stages: Instead of planting all your seeds at once, stagger your plantings every few weeks. This will give you a continuous harvest throughout the season.
Sowing Your Seeds
- Timing is key: In hot climates, it’s best to sow coriander seeds in the early spring or late summer/early fall when temperatures are cooler.
- Direct sowing: Coriander seeds are best sown directly in the garden bed. Avoid planting them too deep, as this can hinder germination. A depth of ¼ inch is ideal.
- Spacing: Space your seeds about 6-8 inches apart.
Providing Shade
- Afternoon shade: As mentioned earlier, coriander benefits from some shade, especially during the hottest part of the day. You can create shade by using shade cloth, row covers, or by planting taller plants nearby.
- Natural shade: Trees or large shrubs can provide natural shade for your coriander plants.
Watering Wisely
- Consistent moisture: Coriander needs consistently moist soil, but avoid overwatering. Water deeply and infrequently, allowing the top inch of soil to dry out between waterings.
- Mulching: Applying a layer of mulch around your coriander plants will help to retain moisture and suppress weeds. Straw, wood chips, or shredded bark are all good options.
Harvesting and Extending the Season
- Harvesting: Pick coriander leaves when they are young and tender. Cut the leaves about 1 inch above the soil line.
- Successive plantings: To extend your harvest, sow new seeds every few weeks. This will ensure that you have a continuous supply of fresh coriander throughout the season.
Dealing with Pests and Diseases
- Aphids: These tiny insects can quickly infest coriander plants. Use a strong jet of water to dislodge them or introduce ladybugs, which are natural predators of aphids.
- Powdery mildew: This fungal disease can appear as a white powdery coating on the leaves. To prevent powdery mildew, avoid overhead watering and ensure good air circulation around your plants.
The Final Harvest: Enjoying Your Coriander
With a little care and attention, you can successfully grow coriander even in hot weather. Enjoy the fresh flavor of your homegrown coriander in salads, sauces, and other dishes.
Popular Questions
Q: Can I grow coriander in containers?
A: Yes, you can grow coriander in containers. Choose a pot that is at least 12 inches wide and deep. Use a well-draining potting mix and water regularly.
Q: What should I do if my coriander plants bolt?
A: Once a coriander plant bolts, it will produce flowers and seeds, resulting in bitter leaves. You can try to cut off the flower stalks to encourage leaf growth, but the plant will likely not produce as many leaves as it would have if it had not bolted. It’s best to start new plants for a continuous harvest.
Q: How long does coriander take to grow?
A: Coriander typically takes 4-6 weeks to mature. The leaves can be harvested as soon as they are large enough.
Q: Can I save coriander seeds for next year?
A: Yes, you can save coriander seeds for next year. Allow the seed heads to dry completely on the plant. Then, harvest the seeds and store them in a cool, dry place.
