Growing Cilantro Hydroponically: Complete Tower Garden Guide

🌿 Cilantro at a Glance

• Botanical name: Coriandrum sativum
• Growing season: Cool-season annual
• Where to grow: Indoors under grow lights or outdoors in cooler weather
• Tower Garden placement: Regular ports for fuller plants; Baby Greens ports for young growth
• Pollination: Not needed for leaf production
• Support: Usually unnecessary
• Harvest cue: Around 6 inches tall, with enough leaves to spare

Fun fact: cilantro and coriander come from the same plant! In the U.S., cilantro usually means the fresh leaves and stems, while coriander refers to the mature seeds.

🌱 Starting Cilantro from Seeds or Seedlings

Choosing a variety

For fresh leaves, choose a slow-bolting variety such as Santo cilantro. Slow-bolting gives you more harvesting time, but even Santo will eventually flower.

You can also browse our herb seedlings for more kitchen favorites.

Starting from seed

Sow 6–8 seeds per moistened rockwool cube. Germination can take up to 3 weeks, so be patient with this one!

Keep cubes moist, not submerged, and provide suitable light as seedlings emerge. Once they have established roots and several true leaves, follow our Seeds & Seedlings Guide.

Planting a seedling

Seat the net pot correctly and make sure the cube receives water when the pump runs.

☀️ Growing Cilantro Indoors and Outdoors

Outdoors: choose the cooler part of your season

Cilantro prefers cool to mild weather. Spring and fall are great starting points in many climates. Here in Florida, fall and winter usually work better than the hottest summer months.

Give it full sun to partial shade. Morning sun with some afternoon shade can help in warmer conditions, but shade cannot turn a hot summer into winter!

Indoors: light matters as much as temperature

An indoor Tower Garden can offer cilantro a cooler place to grow during hot weather. Use suitable grow lights and keep it away from heat sources.

For a mixed Tower Garden, start with 14–16 hours of light daily, followed by a completely dark period. Make sure light reaches the cilantro as neighboring crops fill out.

Indoor growing doesn't stop cilantro from aging or flowering. Keep replacement plants coming along rather than expecting one plant to supply every taco night.

For setup help, visit our Indoor Growing Guide and Light Guide.

💧 Everyday Cilantro Care

No special cilantro feeding routine needed in a mixed Tower Garden! Keep the shared system happy:

• Check water levels and confirm the pump is circulating properly.
• Use the appropriate nutrient strength for your plants and conditions.
• Keep reservoir pH between 5.5 and 6.5.
• Leave room for light and airflow.
• Remove damaged leaves and check plants while harvesting.

For a newly planted tower, use 10 ml Mineral Blend A and 10 ml B per gallon. Established gardens under normal conditions use 20 ml of each per gallon. Add concentrates separately to the water.

Adding one cilantro seedling to an established tower doesn't mean you need to drain everything! See our Nutrient Guide and Water Guide.

✂️ How to Harvest Cilantro

Start with a small picking when the plant is around 6 inches tall and growing well. Snip stems approximately 2 inches above the rockwool with clean scissors.

Take what you need for dinner, then give the plant time to regrow. Love big bunches of cilantro? Grow several plants so you can spread the harvest around.

Don't toss those tender stems! They're delicious chopped with the leaves in salsa, sauces, and cilantro-lime rice.

🌼 Why Cilantro Bolts—and How to Keep Harvests Coming

Bolting is when cilantro switches from producing tender leaves to flowering and making seeds. Look for a taller central stalk, finer feathery leaves, and little flower buds.

Warm weather and longer days can speed it up. A plant shooting skyward isn't necessarily giving you a bumper crop of cilantro!

Regular harvesting helps you enjoy the leafy stage, but it won't keep cilantro young forever. Removing flower stalks may buy a little time, but won't reliably return a flowering plant to leafy growth.

Start the next batch before you need it

Sow a small batch every 2–3 weeks during suitable conditions. That's succession planting: young plants are ready as older ones finish.

If every plant bolts quickly, reconsider the temperature and growing season. Planting more often won't solve persistent heat.

Want coriander seeds instead?

Let a plant flower and form seeds. When seed heads brown, collect them in a paper bag, finish drying, and store in a dry sealed container. Outdoors, the flowers can attract pollinators too.

🔎 Common Cilantro Problems

Yellow leaves or slow growth

Check lighting, water, pump, pH, and nutrient mix before adding more minerals. Consider the plant's age, too.

Long, thin stems

Is the plant reaching for light or starting to flower? Sparse stretched growth points to lighting; a tall flower stalk and finer leaves suggest bolting.

Wilting

Confirm water reaches the cube during pump cycles. Then check for heat or root problems. If several plants wilt together, check the shared system first.

Insects or damaged leaves

Inspect affected and neighboring plants. Identify the pest before treating, and use products labeled for edible herbs and the pest involved.

Powdery mildew

White, powdery patches on leaves can signal powdery mildew. Improve airflow, remove heavily affected foliage, and avoid overcrowding.

Need help identifying the issue? Visit our Tower Garden Troubleshooting Hub.

❓ Cilantro Growing FAQs

Can cilantro grow hydroponically?

Yes! Cilantro grows in Tower Gardens and other suitable hydroponic or aeroponic systems. Cooler conditions, adequate light, and consistent water and nutrients are the essentials.

Will cilantro grow back after harvesting?

Healthy plants can regrow after light harvesting if you leave the center and enough foliage. Regrowth slows as flowering begins.

Can I grow cilantro in Baby Greens ports?

Yes, for young growth and frequent small harvests. Regular ports give fuller plants more space.

Is cilantro the same as culantro?

No. Culantro is a different plant with long serrated leaves and a similar flavor. It handles summer heat better.

Should I wait until the plant gets big before harvesting?

Start small harvests once it's established. Waiting for a huge plant can mean missing its tender leafy stage!

🌿 Grow Your Own Cilantro

Start from seed or skip the wait with live seedlings ready for your Tower Garden. Fresh salsa is calling!

Shop Cilantro Seeds   |   Shop Cilantro Seedlings