What Is Hydroponics?

Hydroponics is a method of growing plants without soil, using nutrient-rich water to deliver everything plants need directly to their roots. Instead of relying on soil, hydroponic systems carefully control water, nutrients, oxygen, and light to support healthy plant growth.

How Hydroponics Works

All hydroponic systems provide plants with four essential elements:

Water

Water acts as the primary growing medium, carrying dissolved nutrients straight to plant roots. Because water is reused and recirculated, hydroponics uses up to 90% less water than traditional soil farming.

Nutrients

Plants receive precise amounts of essential nutrients such as nitrogen (N), phosphorus (P), potassium (K), calcium, magnesium, and micronutrients. Because nutrients are delivered directly to roots, plants absorb them more efficiently.

Oxygen

Roots need oxygen to grow. Hydroponic systems ensure oxygen reaches the root zone through: •Air stones and air pumps •Falling or splashing water •Air gaps between roots and water Proper oxygenation promotes faster growth and healthier plants.

Light

Plants use light for photosynthesis. Hydroponics can use: •Sunlight (outdoor or greenhouse systems) •LED grow lights (indoor systems), which are energy-efficient and allow year-round growing

Types of Hydroponic Systems

Hydroponic systems generally fall into two categories:

Passive Systems

• No pumps or electricity • Use gravity, air gaps, or wicks • Simple, low-maintenance, and beginner-friendly

Active Systems

• Use pumps and aeration • Allow greater control and higher yields • Common in classroom and vertical farming setups

Common system types include:

• Deep Water Culture (DWC) • Nutrient Film Technique (NFT) • Kratky system • Drip system • Aeroponics

Grow to Know uses DWC and vertical systems because they are affordable, reliable, and ideal for student learning.

Challenges and How Grow to Know Addresses Them

Hydroponics can require:

Electricity (for pumps or lights)
Basic knowledge of pH and nutrients
Initial setup materials

Grow to Know addresses these challenges by:

Using low-cost, student-built systems
Teaching simple monitoring routines
Offering step-by-step guidance
Prioritizing energy-conscious design

Ideal for classroom

Not Ideal for classroom

Benefits of Hydroponics

01 Uses significantly less water than traditional farming

02 Allows year-round growing

03 Requires minimal space

04 Reduces pests and the need for pesticides

05 Produces consistent, high-quality crops

Why Hydroponics for Food Access

Hydroponics makes it possible to grow fresh food locally, close to the communities that need it most, regardless of season or available land.

What Is Hydroponics?