---
title: 15. How to read the needs of the plant in hydroponics
description: "Learn how to read plant signals in hydroponics: color, leaves, roots, growth and microclimate. Practical guide to growing accurately, stably and without error."
image: https://tomatoplus.com/hubfs/Cialda.jpeg
---

 Nov 28, 2025 2:47:50 PM

# 15. How to read the needs of the plant in hydroponics

[ Tomato+ Team ](https://tomatoplus.com/en/blog/author/tomato-team)

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15. How to read the needs of the plant in hydroponics

3:34

 

### *Understanding the signals to grow accurately and without errors*

In hydroponics, plants communicate all the time-you just have to know how to interpret the signals. Whether it's a basil, a lettuce or a more demanding variety, every change in leaves, color, growth or roots offers valuable information about their status.  
The goal is not to "guess," but to **read plants in real time** to intervene before problems occur.

In this article we look at how to do this easily, even if you are not an agronomist.

---

## **1. Leaf color: the first indicator to watch**

Color tells immediately if the plant is in balance.

### ✔ Bright green

Sign of health: balanced nutrients, proper light, active roots.

### ⚠ Light green or yellowing.

Often indicates:

- nitrogen, iron or magnesium deficiency
- insufficient light
- out-of-range pH stress

**How to intervene:** check EC, pH and photoperiod.

### ❌ Spots or burns.

Usually related to:

- EC too high
- light that is too bright or too close
- major temperature fluctuations

---

## **2. Plant shape and posture: the plant "body language"**

### ❥ Closed leaves, curling downward.

Excess water or root saturation.  
In hydroponics it occurs when oxygen in the water is low or the solution temperature rises too high.

### ❥ Leaves pointing upward.

Typical sign of strong but positive light.  
However, if they begin to stiffen, the light is too much.

### ❥ Slow growth and long internodes.

Means the plant is "seeking" light.  
Increasing photoperiod intensity and stability brings back compactness.

---

## **3. Analyze the roots: the real engine of cultivation**

In hydroponics, roots can be seen (huge advantage over soil).

### ✔ Crisp, white roots.

Perfect signal: optimal oxygenation and balanced nutrients.

### ⚠ Beige or slightly slimy roots.

Start of stress: nutrient solution temperature too high or insufficient circulation.

### ❌ Brown and strong-smelling roots.

Alarm: possible pathogen or severely insufficient oxygenation.

---

## **4. Growth: speed, symmetry and consistency**

### ❥ Homogeneous growth

Indicates stable microclimate: air, temperature and light under control.

### ❥ Uneven or sloping growth.

Usually caused by uneven light source or direct air flows.

### ❥ Soft or sluggish tissues.

Often related to insufficient nutrients or too low EC.  
In some cases also to incorrect photoperiod.

---

## **5. Microclimate: reading indirect signals.**

Plants react quickly to:

- too high humidity → mold risk, shiny, thin leaves
- humidity too low → dehydration, dry margins
- high temperature → large but weak leaves
- low temperature → slow growth, dark color

In Tomato+ greenhouses this management is automated thanks to microclimate control and integrated sensors , but recognizing the symptoms remains useful for anyone.

---

## **6. Data: the most reliable way to read plants**

In addition to visual signals, Tomato+ uses:

- **continuous telemetry**
- **AI image recognition**
- **Dynamic growth plans**
- **Spectrum, height, pod status, and root sensors**

This allows every plant signal to be transformed into data, automatically correcting light, irrigation, nutrients or photoperiod.

It is the transition from "by eye" cultivation to **data-driven** cultivation.

---

## **Conclusion**

Reading the needs of the plant in hydroponics does not require complex skills: just observe the color, shape, growth and roots.  
With smart systems like Tomato+, these signals become data that enable extremely precise, stable, and waste-free cultivation.

Thank you for reading this article. Keep following us to discover new content on hydroponics, vertical farming, and smart agriculture.  
Tomato+ Team

[ Explore all articles ](https://tomatoplus.com/en/blog)

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