Here’s What You Need To Know To Grow Cilantro Hydroponically

Cilantro, that tasty green herb, is actually two popular seasonings in one: the leaves are called cilantro and the seeds are coriander.

It is just as often used in medicine for everything from toothaches to cancer as it is eaten.  

Growing your own ensures you with a steady supply of fresh and healthy cilantro.

Can you grow cilantro hydroponically? Hydroponic cilantro (coriander) is an easy-to-grow plant compared to other popular hydroponic crops like peppers and tomatoes. Like lettuce, cilantro doesn’t take up as much room, uptake as much food, or require as much space as other common hydroponic plants. 

Read on below and learn all that you need to know about growing cilantro hydroponically.

Growing Cilantro Hydroponically: What You Need To Know

Cilantro isn’t an overly complicated plant to grow hydroponically. That said, as with any hydroponic crop, you will need a few basics before you get started.

What you need to get started:

  1. A hydroponic system of your choice
  2. Coriander seeds
  3. A source of clean, fresh water
  4. Liquid fertilizer or nutrients
  5. Growing medium
  6. Grow tray for seedlings
  7. Lights (if growing indoors)
  8. Control over the temperature/humidity (if growing indoors)

From seed to harvest, expect the process to take between one and a half to two months.

Following the guide below, you should be munching on your own hydroponic cilantro in just a few weeks!

The Basics

  • Best Cilantro Varieties To Grow Hydroponically: Calypso, Delfino, Slo Bolt, Santos, Costa Rica, Lemon, Leisure, and Moroccan
  • Seed Germination Time: 7 to 10 days
  • When To Transplant Into System: when 2 sets of leaves are showing
  • Best Growing Medium: Rockwool or coco-coir
  • Best Hydroponic System for Cilantro: Ebb and flow, DWC, NFT, drip, and aeroponics
  • Ideal pH: 6.5
  • Ideal Temperature: 45°F and 70°F
  • Ideal EC/TDS: 1.5/800-1,000
  • Lighting Requirements: 12 to 14 hours daily
  • Nutrients Needed: High nitrogen and phosphorus
  • Time Until First Harvest: 50 to 55 days
  • Time To Maturity: 40 to 50 days

Starting Cilantro for Hydroponics

Cilantro is best started in rockwool cubes (find bargain-priced cubes here) or coco-coir starters. Typically, the seeds need only a week and a half or so to sprout.

After germination occurs, transferring the seedlings should happen immediately.

Make sure that you get them transplanted into the permanent growing medium before their roots begin rapidly developing.

Carefully remove the cilantro seedlings from their starters and place them in the growing site, half-filled with growing medium.

Once the roots are secure, fill the rest of the grow site up with growing medium.

Temperatures for Hydroponic Cilantro

Cilantro can withstand temperatures of as low as 10°F and as high as nearly 90°F, but the ideal temperature is between 50°F and 80°F

Temperatures below 50°F may cause slower growth. Likewise, temperatures over 85°F may cause bolting.

All things considered, cilantro does better in slightly cooler weather.

EC, TDS and pH Levels for Hydroponic Cilantro

Generally speaking, the EC level affects how well your cilantro will be able to uptake nutrients and water through its roots. The ideal EC level for cilantro is 1.5.

The TDS reading should be between 800 to 1,000, adjusting as needed. The pH level needs to be between 6.0 to 6.8.

In this article, I explain all about EC, pH, and how to adjust them in your system.

Spacing Hydroponic Cilantro

Nine to 12 inches is the ideal spacing for hydroponic cilantro.

Spacing plants by these measurements allows enough room for fully developed cilantro once they begin to mature and take up more space.

Light Requirements for Hydroponic Cilantro

Cilantro plants require somewhere between 12 and 14 hours of indoor lighting per day.

Outside, they can do with less. LED lights are recommended for fast and steady growth of hydroponic cilantro.

Nutrients for Growing Cilantro Hydroponically

As far as nutrients go, a high nitrogen and phosphorus content is preferred by hydroponic cilantro plants.

Something along the lines of a well-balanced 10-10-10 fertilizer is perfect.

The nutrients need to be topped off regularly. Replacing the water and nutrients completely should be done at least every few weeks.

Harvesting Hydroponic Cilantro

Hydroponic cilantro is generally ready for harvest around 50 to 55 days after planting from seeds.

If counting from germination time, the harvest time is anywhere from 40 to 48 days. 

Pick the leaves by hand or use scissors to trim back entire sections of the plant away from the stem.

Separate the leaves and tie them into bunches with string after checking them for pests and dead parts.

Drying cilantro is as easy as hanging the bundles up in the air.

Check back in 1 to 2 weeks, and they should be fully dry and ready to be put into containers and used as cooking ingredients in the kitchen.

Best Hydroponic System for Growing Cilantro

Ebb and flow, DWC, NFT, drip, and aeroponics are equally effective hydroponic systems for growing cilantro. 

Aeroponics and ebb and flow, however, are probably the most popular hydroponic growing systems for cilantro because they allow the plants so much space compared to other hydroponic methods and setups.

Best Cilantro Varieties for Hydroponic Growing

Multiple rows of cilantro growing hydroponically.

Depending on the exact type and taste of cilantro that you prefer, there are a number of varieties (in addition to those listed above) to consider for growing hydroponically.

  • Indian Summer Cilantro – This version of cilantro looks more like parsley and takes more time to grow.
  • Leaf Cilantro – Leaf cilantro is the most popular and widely used type of cilantro.
  • Mexican Coriander – This cilantro variety is a slender Mexican version.
  • Potluck Coriander – A harder-than-normal-to-grow variety of cilantro.
  • Seed Coriander – This is simply bolting coriander grown for seeds.
  • Vietnamese Cilantro – A southeastern Asian variety that grows even in high heat.

Related Question:

Can You Grow Hydroponic Cilantro in a Mason Jar?

Cilantro is easily grown in hydroponic mason jars due to their non-woody nature and low space requirements.

Not only are jars with cilantro easy as pie to grow, but they also look really great on the windowsill. That said, cilantro grows well in jars with soil or hydroponic systems.

A Final Word About How to Grow Cilantro Hydroponically

Cilantro is a fun and easy crop to grow hydroponically. It grows rather fast, and it’s tasty and good for your health!

What reason could you possibly have to not start growing cilantro hydroponically (or at least planning to) today?