Why use amino acids biostimulants in Hydroponics

In this blog we’re diving into a fascinating and effective class of biostimulants—amino acids. While they’re more commonly associated with human health and nutrition, amino acids also offer a wide range of benefits for plants, especially in hydroponic systems.

Whether you’re a home grower or commercial cultivator, understanding how and when to use amino acids can significantly improve root development, nutrient efficiency, and stress tolerance in your crops.

What Are Amino Acids?

Amino acids are the building blocks of proteins. Each one consists of:

• A central carbon atom
• An amine group (contains nitrogen)
• A carboxylic acid group
• A variable side chain, which determines the specific amino acid

While plants naturally synthesize amino acids, applying them externally can enhance biological processes—but only when applied correctly.

Why Use Amino Acids in Hydroponics?

Although plants don’t need amino acids to survive (they synthesize their own), they can still benefit immensely from supplementation under specific conditions.

✅ 1. Boosts Root Growth

• Glutamic acid dramatically enhances root development.
• Research at Lancaster University shows it stimulates roots 100–1000x more than other amino acids.

✅ 2. Promotes Hormone Production

• Tryptophan is a precursor to auxins, the hormones responsible for root initiation and shoot elongation—ideal for cuttings or transplants.

✅ 3. Enhances Nitrogen Efficiency

• Amino acids are a great alternative nitrogen source, particularly in cold conditions when plants struggle to uptake nitrogen from traditional sources.

✅ 4. Supports Microbial Activity

• Amino acids serve as food for beneficial microbes, improving nutrient cycling and plant immunity.

✅ 5. Improves Sulfur Nutrition

• Certain amino acids contain sulfur, contributing to stronger plant growth and improved stress resistance.

Avoid Single Amino Acids—Use a Blend

Here’s the catch: never apply just one amino acid. Doing so can confuse the plant’s internal nutrient signaling, shutting down production of entire amino acid families. Always opt for broad-spectrum blends derived from natural sources.

Common amino acid sources include:

• Pea protein
• Yeast extracts
• Hydrolyzed animal byproducts (e.g., chicken feathers, pig blood)

Each source is broken down using acid or alkali hydrolysis to release free amino acids from proteins.

⚠️ Pro Tip: Avoid amino acids derived from leather industry waste due to potential contamination with heavy metals.

L- vs. D-Amino Acids: What’s the Difference?

Only L-amino acids are naturally active in plant systems. Lab-synthesized or chemically processed products often contain a mix of L- and D- isomers, and D-amino acids may be ineffective—or even harmful.

Choose L-amino acid products, ideally cold-processed and derived from natural materials.

Can You Mix Amino Acids with Seaweed Extracts?

Many growers do—and not always for good reason. While both are useful biostimulants, amino acids and alkaline seaweed extracts may interact poorly. Some people have suggested that extreme pH values might cause ‘L-isomers’ to switch to ‘D-isomers’, but this has never been confirmed.

✔️ Recommendation: Only blend amino acids with acidic or neutral products to prevent degradation or isomer flipping.

Amino Acids in Commercial Fertilizers

If you’re already using liquid fertilizers or biostimulant blends, chances are they contain undeclared amino acids—often under branded or proprietary names. Look for:

• “Root stimulants”
• “Growth tonics”
• “Bio-enhancers”

To maximize transparency and cost-effectiveness, you may want to source standalone amino acid concentrates from reputable suppliers.

Final Thoughts

Amino acids are more than just nutritional extras—they are vital biostimulants that drive plant performance, especially under stress. From stimulating root growth to supporting microbes and improving nutrient mobility, amino acids can give your hydroponic system a competitive edge.

Just remember:

• Use blends, not single amino acids
• Prioritize L-isomers
• Combine them thoughtfully with other products

Article by Dr Russell Sharp

If you would like to keep up to date with subjects just like this, you can listen to both our podcasts! Links can be found bellow:

Hydroponics Daily Podcast: https://open.spotify.com/show/207T7p7fw9sPjINfSjVXW2

Cereal Killers Podcast: https://t.co/eSEbBkTVHl