How to Grow Nasturtiums from Seed (Hydroponic Growing)

Nasturtiums are extremely easy to grow and perform well in hydroponic growing systems, producing lush green coverage and vibrant edible flowers.

They are also valued in grow spaces for helping deter pests while producing aromatic, edible foliage and flowers.

Germinating Nasturtium Seeds

Nasturtium seeds are large and easy to handle, making them ideal for beginners in hydroponic propagation.

Germination Conditions

• Temperature: 18–25°C
• Humidity: 72–100%
• Supports softening of the seed casing and faster germination

The germination method remains consistent across hydroponic media such as coco-based substrates or propagation plugs.

Planting Guidelines

• Sow seeds 2–5mm deep
• Space approximately 20cm apart
• Germination typically occurs within 7–10 days

Maintaining stable root zone temperature is critical, as cold conditions can slow or stop seedling metabolism.

Nutrient Requirements for Hydroponic Nasturtiums

Feeding nasturtiums in hydroponic systems is straightforward.

Vegetative Stage

• Use a balanced A/B base nutrient solution
• Ensure adequate magnesium availability

Flowering Stage

• Reduce nitrogen (N)
• Increase phosphorus (P) and potassium (K)

This supports stronger flowering and improved plant development.

pH and EC Requirements

Maintaining correct hydroponic parameters is essential:

Indoor Hydroponic Range

• pH: 5.8–6.5
• EC: 0.8–1.6

Outdoor/Variable Conditions

• pH: 6.0–7.2
• EC: 0.4–1.8

Growth Timeline

In hydroponic systems, nasturtiums can complete their full cycle in approximately:

• 12 weeks from seed to finish

Taste and Edible Uses

Nasturtiums are widely used as edible plants:

• Young leaves: Tender, crisp, mild peppery flavour
• Mature leaves and flowers: Stronger, more pronounced taste

They can be used in:

• Salads (as a substitute for rocket)
• Garnishes
• Creative dishes such as pairing with desserts

The name “nasturtium” comes from Latin, meaning “nose twist”, referencing its peppery flavour.

Additional Benefits of Nasturtiums

Beyond hydroponic growing, nasturtiums are known for:

• Supporting pest management in grow environments
• Producing visually appealing foliage and flowers

They also contain high levels of vitamin C.

Summary

Nasturtiums are a versatile and easy option for hydroponic growers.

With:

• Simple germination requirements
• Minimal feeding demands
• Adaptability to hydroponic systems

They are an excellent choice for both beginners and experienced growers looking to add diversity to their grow space.