Hawaii’s warm climate allows for year-round cilantro planting, though the cooler months from October to March produce the most flavorful leaves. If you’re searching for the best time to plant cilantro in hawaii, you’ve come to the right place. This guide breaks down everything you need to know for a successful cilantro harvest in the Aloha State.
Cilantro is a tricky herb. It loves cool weather but hates frost. In Hawaii, you don’t have frost, but you do have heat. Heat makes cilantro bolt, or go to seed, fast. That means bitter leaves and a short harvest window. So timing matters, even in paradise.
Let’s get into the details. We’ll cover seasons, microclimates, soil prep, and harvesting tips. By the end, you’ll know exactly when to plant cilantro in your specific part of Hawaii.
Understanding Cilantro’s Growing Needs In Hawaii
Cilantro is a cool-season annual. It grows best when temperatures stay between 50°F and 85°F. In Hawaii, many areas are warmer than that, especially at lower elevations. That’s why the best time to plant cilantro in hawaii is during the cooler months.
When temps go above 85°F, cilantro thinks it’s time to reproduce. It sends up a tall flower stalk, and the leaves turn lacy and bitter. This is called bolting. Once it bolts, the plant is done producing usable leaves.
So your goal is to plant when the weather is mild. That gives you a longer harvest before the heat triggers bolting.
Why Cooler Months Work Best
From October to March, Hawaii’s temperatures are more moderate. Days are warm but not scorching. Nights are cooler. This is ideal for cilantro. The leaves grow slower, which means they develop more flavor. They stay tender and green for weeks longer than summer-planted cilantro.
In contrast, cilantro planted in June or July might bolt in just three to four weeks. You barely get a harvest. So if you want a steady supply, stick with the cooler season.
Best Time To Plant Cilantro In Hawaii By Region
Hawaii has many microclimates. What works in Hilo might not work in Waikiki. Let’s break it down by elevation and location.
Low Elevation Areas (Sea Level To 500 Feet)
Places like Honolulu, Kona, and Kahului are warm year-round. Even in winter, daytime temps can hit 80°F. For these areas, the best time to plant cilantro in hawaii is from November through February. That’s when nights are coolest, and the risk of bolting is lowest.
Plant in partial shade if possible. Morning sun with afternoon shade works great. This helps keep the soil cool and delays bolting.
Mid Elevation Areas (500 To 2,000 Feet)
Places like Volcano, Kula, and parts of Kauai’s interior are cooler. You can plant cilantro from September through April. The longer cool season gives you more flexibility. You might even get two or three succession plantings.
These areas are ideal for cilantro. The cooler temps mean slower growth and richer flavor. You can often harvest for two months or more.
High Elevation Areas (Above 2,000 Feet)
At higher elevations, like Waimea or Haleakala, it can get chilly at night. Frost is rare but possible. Here, you can plant cilantro almost year-round, but avoid the wettest months if drainage is poor. The best window is March through October, when days are warmer and nights are mild.
In these areas, cilantro might even survive into summer without bolting. Just watch for sudden heat waves.
How To Plant Cilantro For Success
Now that you know when to plant, let’s talk about how. Follow these steps for a healthy crop.
Choose The Right Location
Cilantro needs full sun in cooler months but partial shade in warmer months. In Hawaii, afternoon shade is often a must. Find a spot that gets 4 to 6 hours of morning sun and shade after noon.
If you’re planting in summer, go for a spot with dappled light all day. Under a tree or on a lanai works well.
Prepare The Soil
Cilantro likes well-draining soil rich in organic matter. Hawaii’s soil can be volcanic and heavy. Mix in compost or aged manure before planting. Aim for a pH between 6.2 and 6.8.
If you’re using pots, choose a container at least 8 inches deep. Use a high-quality potting mix with perlite for drainage.
Sow Seeds Directly
Cilantro has a taproot. It doesn’t transplant well. Always sow seeds directly in the ground or pot. Plant seeds 1/4 inch deep and about 2 inches apart. Cover lightly with soil and water gently.
Seeds germinate in 7 to 10 days. Keep the soil moist but not soggy. In Hawaii’s heat, you might need to water daily.
Thin Seedlings
Once seedlings have two sets of true leaves, thin them to 4 to 6 inches apart. This gives each plant room to grow. You can eat the thinnings—they’re delicious.
Don’t skip thinning. Crowded plants bolt faster and produce less.
Caring For Cilantro In Hawaii’s Climate
Cilantro is low-maintenance, but it needs a little care in Hawaii’s conditions.
Watering
Keep the soil consistently moist. Cilantro hates drying out. In hot weather, you might need to water twice a day. Use a drip system or water at the base to avoid wetting the leaves, which can cause fungal issues.
Mulch around the plants with straw or dried leaves. This keeps the soil cool and reduces evaporation.
Fertilizing
Cilantro is a light feeder. Too much nitrogen makes leaves less flavorful. Use a balanced, slow-release fertilizer at planting time. After that, a light dose of liquid seaweed every two weeks is enough.
If leaves turn yellow, add a little fish emulsion. But don’t overdo it.
Pest Control
In Hawaii, aphids and caterpillars can bother cilantro. Check the undersides of leaves regularly. Spray off aphids with a strong stream of water. For caterpillars, pick them off by hand or use neem oil.
Slugs and snails are also a problem in wet areas. Use beer traps or copper tape around pots.
Harvesting Cilantro At The Right Time
You can start harvesting when the plant is 6 to 8 inches tall. Don’t wait too long. Older leaves are tougher and more bitter.
How To Harvest
Use scissors or pinch off outer leaves at the base. Leave the inner leaves to keep growing. Never cut more than one-third of the plant at once. This stresses it and can trigger bolting.
Harvest in the morning when leaves are crisp. Rinse and dry them gently. Use them fresh or store in the fridge with a damp paper towel.
Extend Your Harvest
To delay bolting, keep the plant cool. Mulch, shade cloth, and regular watering help. Also, pinch off any flower buds as soon as you see them. This forces the plant to focus on leaf production.
Once the plant bolts, the leaves lose flavor. You can let it go to seed and collect coriander seeds for cooking or planting later.
Succession Planting For Continuous Cilantro
Cilantro doesn’t regrow well after bolting. So the best way to have a steady supply is to plant every two to three weeks. This is called succession planting.
During the cool season, plant a new batch every two weeks. That way, when one batch bolts, the next is ready to harvest. You’ll never run out.
In warmer months, you might need to plant every three weeks because growth is faster. Adjust based on your local conditions.
Container Gardening For Flexibility
If you have limited space, grow cilantro in pots. You can move them to cooler spots as needed. Use wide, shallow pots for best results. Plant several seeds per pot and thin as they grow.
Pots also let you control soil quality and watering more easily. Plus, you can bring them indoors during a heat wave.
Common Cilantro Problems In Hawaii And Solutions
Even with perfect timing, you might face issues. Here’s how to handle them.
Bolting Too Fast
If your cilantro bolts in just a few weeks, it’s too hot. Move to a shadier spot or plant later in the season. Also, check your watering. Dry soil stresses the plant and speeds up bolting.
Some varieties are more heat-tolerant. Try ‘Santo’ or ‘Calypso’ for slower bolting.
Yellow Leaves
Yellow leaves often mean overwatering or poor drainage. Let the soil dry out a bit between waterings. If the soil is heavy, mix in sand or perlite.
It could also be a nitrogen deficiency. Add a light dose of fish emulsion or compost tea.
Leggy Growth
Leggy, thin stems mean the plant isn’t getting enough light. Move it to a sunnier spot. In Hawaii, morning sun is best. Afternoon shade prevents legginess from heat stress.
Pests
Aphids and whiteflies are common. Spray with insecticidal soap or neem oil. For severe infestations, remove affected leaves. Keep the area clean to prevent pests from spreading.
Frequently Asked Questions
Can I plant cilantro in Hawaii during summer?
Yes, but it’s challenging. Choose a shady spot and heat-tolerant varieties. Expect a shorter harvest. The best time to plant cilantro in hawaii is still the cooler months.
How long does cilantro take to grow in Hawaii?
From seed to harvest, about 3 to 4 weeks. In cooler months, it might take 5 weeks. In summer, it can bolt in 3 weeks.
What is the best cilantro variety for Hawaii?
‘Santo’ and ‘Calypso’ are heat-tolerant and slow to bolt. ‘Leisure’ is another good choice for warm climates.
Can I grow cilantro indoors in Hawaii?
Yes, if you have a sunny window or grow lights. Keep the temperature below 80°F. Use a well-draining pot and water regularly.
Why does my cilantro taste soapy?
Some people have a genetic trait that makes cilantro taste soapy. If you don’t, it might be bolting. Harvest leaves when they are young and fresh.
Final Tips For The Best Cilantro Harvest
Planting at the right time is half the battle. The other half is care. Keep your cilantro cool, watered, and well-fed. Harvest often to encourage new growth.
Remember, the best time to plant cilantro in hawaii is from October to March. But with shade and care, you can stretch that window. Experiment with different spots and varieties to find what works for your microclimate.
Cilantro is rewarding to grow. It adds fresh flavor to so many dishes. With a little planning, you can enjoy it almost year-round in Hawaii. Happy planting!