What is hydrogen-rich water for plants?

Hydrogen-rich water (HRW) is water containing dissolved molecular hydrogen (H₂). In plant research it is used as a delivery method for H₂ to the root zone or, in some studies, as a foliar treatment.

Can hydrogen-rich water be used for greenhouse irrigation?

Hydrogen-rich water can be applied through irrigation, and controlled-environment agriculture is a practical setting for evaluating it. Commercial greenhouse performance has not been established and requires crop-specific controlled trials.

What does hydrogen-rich water do to plants?

Published research reports effects on reactive oxygen species signalling, antioxidant systems, hormonal signalling, ion homeostasis and gene expression. These are reported physiological effects under experimental conditions, not guaranteed outcomes.

Does hydrogen-rich water improve plant growth?

Some studies report improved seedling vigor, photosynthetic efficiency and biomass accumulation, in at least one case at low HRW concentrations. Results depend on crop, hydrogen concentration, treatment method, water chemistry and experimental conditions.

Has hydrogen-rich water been studied in tomatoes?

Yes. A 2025 study in Scientia Horticulturae reported that HRW enhanced antioxidant capacity, reduced drought-associated damage, helped maintain water balance and affected gene expression, stomatal responses and root ion stability in tomato.

Has hydrogen-rich water been studied in cucumbers?

Yes. A 2025 study in Plant Physiology and Biochemistry reported increased vitamin C and soluble sucrose content in cucumber fruit alongside changes in genes associated with photosynthesis and antioxidant biosynthesis.

Has hydrogen-rich water been studied in lettuce?

Yes. Lettuce was one of three vegetable crops examined in the 2025 Plant Physiology and Biochemistry study on HRW and ascorbate biosynthesis, which reported improved seedling vigor and biomass accumulation at low HRW concentrations.

Can hydrogen-rich water help plants tolerate drought?

Research including a 2025 tomato study and the 2026 Frontiers in Plant Science review reports that HRW is associated with improved drought-stress responses. These are experimental findings and are not a guarantee of performance in commercial production.

Does hydrogen-rich water affect antioxidant systems in plants?

Antioxidant regulation is one of the most consistently reported themes in HRW research, including ROS regulation and antioxidant biosynthesis pathways, as synthesised in the 2026 Frontiers in Plant Science review.

How is hydrogen-rich irrigation water produced?

Hydrogen is dissolved into water at a hydrogenation point, for example by dissolution of hydrogen gas into an irrigation reservoir or an in-line treatment stage upstream of distribution. Achieved concentration depends on the method, pressure, temperature and residence time.

How long does hydrogen remain dissolved in water?

Dissolved H₂ has relatively low solubility and tends to move into the gas phase, so concentration falls over time. Retention depends on temperature, storage conditions, agitation and whether the system is open or closed.

Can hydrogen-rich water be stored?

Water can be stored, but the dissolved hydrogen concentration should not be assumed to remain constant. Concentration should be measured at the point of irrigation rather than at the point of hydrogenation.

What should be measured in a hydrogen-rich water greenhouse trial?

At minimum: dissolved H₂ concentration at the point of irrigation, water temperature, pH, EC, ORP and irrigation volume, alongside plant measures such as biomass, leaf area, photosynthetic performance, fruit number and mass, fruit quality and yield per square metre, against an untreated control.

Commercial greenhouse with tomato and cucumber rows and industrial irrigation pipework, the delivery pathway for hydrogen-rich water for greenhouse irrigation

Research Note · Controlled-Environment Agriculture

Hydrogen-Rich Water for Greenhouse Irrigation

Molecular hydrogen (H₂) is an emerging area of agricultural and horticultural research. Hydrogen can be delivered to plants in several ways, including hydrogen-rich water (HRW) — water containing dissolved H₂. HRW is of particular interest for controlled-environment agriculture because irrigation water already provides a direct delivery pathway to the root zone, which makes hydrogen-rich water for greenhouse irrigation a testable engineering proposition rather than a theoretical one.

Research to date indicates potential effects on plant growth, photosynthetic performance, antioxidant regulation, stress tolerance and crop quality, but results remain dependent on crop, hydrogen concentration, treatment method, water chemistry and experimental conditions.

Research Status

Hydrogen-rich water is an emerging agricultural technology. Published research reports promising physiological and horticultural effects, but commercial-scale greenhouse performance requires crop-specific validation and controlled trials.

Last reviewed: August 2026

Section 01

Why Hydrogen-Rich Water Is Being Investigated in Agriculture

Molecular hydrogen (H₂) is being studied as a biological signalling and modulatory molecule in plants.
Research has investigated hydrogen-rich water as a practical delivery method for that molecule.
HRW has been studied in relation to oxidative stress, reactive oxygen species (ROS) signalling, antioxidant systems, abiotic stress and plant development.
Potential application routes include irrigation, root-zone treatment and foliar application.
Hydrogen-rich water should not be confused with hydrogen peroxide, oxygenated water, alkaline water or HHO gas.

Terminology

Molecular hydrogen: H₂ — the diatomic hydrogen molecule.
Hydrogen-rich water: Water containing dissolved molecular hydrogen (H₂). It is not hydrogen peroxide (H₂O₂), not oxygenated water and not alkaline water.
HHO / oxyhydrogen: A gas mixture containing hydrogen and oxygen — a completely different application. YBG Industrial's combustion work uses industrial oxyhydrogen terminology, which is unrelated to dissolved-H₂ irrigation.

Section 02

What the Scientific Literature Reports

One 2025 study provides particularly relevant evidence because it examined vegetable crops directly relevant to protected horticulture. The July 2026 Frontiers in Plant Science review is the most recent major synthesis of hydrogen-rich water in plant abiotic stress management.

Published research on hydrogen-rich water in agriculture and horticulture
Study / Review	Year	Crop / Application	Reported finding	Evidence type	Important limitation
Molecular hydrogen in agriculture Faisal et al. Plant Physiology and Biochemistry (indexed on PubMed)	2021	Multiple crops · general agriculture	Review concluded that H₂, often delivered as H₂-saturated water, could have useful roles in plant growth and productivity and in tolerance to stresses including salinity, heavy metals and drought.	Review	A synthesis of prior work, not a controlled crop trial. Does not establish commercial yield outcomes.
The Applications of Molecular Hydrogen in Horticulture Horticulturae	2021	Horticultural crops	Examined molecular hydrogen applications across horticulture and discussed delivery via hydrogen-rich water, covering root development, abiotic stress tolerance, biotic stress, postharvest quality, fruit and vegetable quality, hydrogen-rich water and hydrogen nanobubbles.	Review	Scope is a literature overview across varied experimental designs; effects are not normalised to commercial growing systems.
Hydrogen-rich water enhances vegetable growth and fruit quality by regulating ascorbate biosynthesis Plant Physiology and Biochemistry	2025	Lettuce, tomato, cucumber	Reported improved seedling vigor, improved photosynthetic efficiency, increased biomass accumulation at low HRW concentrations, increased vitamin C and soluble sucrose content in cucumber fruit, and regulation of genes associated with photosynthesis and antioxidant biosynthesis.	Experimental study	Experimental conditions; concentration-dependent. Does not demonstrate commercial greenhouse yield increase.
Hydrogen-rich water alleviates drought stress in tomato: Insights from physiological, molecular, and ionic perspectives Scientia Horticulturae	2025	Tomato · drought stress	Reported enhanced antioxidant capacity, reduced damage associated with drought stress, maintenance of water balance, influence on gene expression and stomatal responses, and effects on ion stability in tomato roots.	Experimental study	Imposed drought-stress conditions; findings describe stress mitigation, not baseline yield under normal irrigation.
Advances in hydrogen-rich water for plant abiotic stress management: antioxidant regulation, hormonal crosstalk, and signal integration Frontiers in Plant Science, Volume 17	24 July 2026	Multiple crops · abiotic stress	Synthesises research on salinity, heavy-metal stress, drought and temperature stress, and on ROS regulation, antioxidant systems, hormonal signalling, ion homeostasis, osmolyte accumulation, chloroplast protection, mitochondrial integrity, gene expression and stress-response pathways.	Review (not a new controlled crop trial)	Mechanistic synthesis across heterogeneous studies; does not itself generate new crop-performance data.
Research Progress of Hydrogen Rich Water in Preservation of Postharvest Horticultural Products: A Review Journal of Agricultural and Food Chemistry	2025	Postharvest horticultural products	Examined HRW in relation to horticultural-product quality and postharvest preservation, including oxidative defense, energy homeostasis, respiration, cell-wall integrity, ethylene biosynthesis and phytohormone signalling.	Review · postharvest	Postharvest research; not direct evidence of greenhouse growth or yield.

Section 03

Why Greenhouse Horticulture Is an Interesting Application

Controlled-environment agriculture is well suited to investigating hydrogenated irrigation water because the variables that confound field research can be held constant and measured:

Irrigation volumes measured
Water chemistry controlled
Hydrogen concentration measured
Crop varieties controlled
Treatment frequency controlled
Untreated control groups maintained
Environmental variables monitored
Crop response measured objectively

Trial Comparison

A greenhouse trial can compare control irrigation water against hydrogen-rich irrigation water while holding the following identical across both arms:

· Nutrient solution
· pH
· EC
· Irrigation volume
· Temperature
· Humidity
· Light
· CO₂
· Cultivar
· Growing medium

Section 04

What Could Be Measured in a Commercial Greenhouse Trial?

Measurement parameters for a hydrogen-rich water greenhouse irrigation trial
Parameter	Measurement
Dissolved H₂ concentration	mg/L or ppm
Water temperature	°C
pH	pH
EC	mS/cm
ORP	mV
Irrigation volume	L/day
Plant height	cm
Root mass	g
Leaf area	cm²
Fresh biomass	g
Dry biomass	g
Photosynthetic performance	Appropriate instrument/metric (e.g. gas-exchange or chlorophyll fluorescence)
Fruit number	count
Fruit mass	kg
Fruit quality	Brix / soluble solids
Vitamin C / ascorbate	Laboratory analysis
Antioxidant markers	Laboratory analysis
Water consumption	L/plant/day
Yield	kg/m²

A properly controlled trial should measure dissolved hydrogen concentration at the point of irrigation, rather than merely assuming that water remains hydrogen-rich after storage or transport.

Section 05

The Challenge of Hydrogen Stability in Irrigation Water

Dissolved H₂ has relatively low solubility in water and can leave the liquid phase rapidly. A 2024 review in Frontiers in Food Science and Technology identifies hydrogen-rich water as a practical delivery method while also noting its instability and the tendency of dissolved hydrogen to enter the gas phase.

Water hydrogenated many hours earlier should not be assumed to retain the same H₂ concentration at the emitter.

Engineering Implication

For greenhouse applications, the point of hydrogenation, residence time, storage conditions, water temperature and delivery method are important engineering variables.

Section 06

Hydrogen-Rich Water and Commercial Greenhouse Irrigation

01
Water source
02
Irrigation reservoir / treatment point
03
Hydrogenation
04
Hydrogen-rich irrigation water
05
Irrigation distribution
06
Root zone

A practical commercial system would need to account for irrigation reservoir volume, daily water consumption, instantaneous irrigation flow, hydrogen concentration, residence time, recirculation, injection or treatment location, nutrient solution chemistry, filtration, pumps, pipework, crop type and irrigation schedule. These are conventional water-engineering variables — the same discipline applied in feedwater and electrolyte quality specification for industrial hydrogen systems.

Section 07

From Research to Commercial Greenhouse Trials

YBG Industrial is interested in the engineering application of molecular hydrogen delivery to commercial horticulture and controlled-environment agriculture.

Where appropriate, hydrogen-rich irrigation could be evaluated through a controlled pilot rather than assumed to produce a particular yield increase.

The relevant competence is water handling, gas dissolution, instrumentation and measurement discipline — the same engineering base applied across YBG Industrial's hydrogen technology work and industrial application portfolio.

Section 08

Potential Greenhouse Crops for Investigation

Tomatoes

Studied in published HRW research, including drought-stress work.

Cucumbers

Studied in published HRW research, including fruit-quality measures.

Lettuce

Studied in published HRW research on seedling vigor and biomass.

Leafy greens

Not specifically covered by the studies cited here; would require its own trial.

Peppers

Not specifically covered by the studies cited here; would require its own trial.

Herbs

Not specifically covered by the studies cited here; would require its own trial.

Other controlled-environment crops

Assessed case by case against irrigation design and crop physiology.

Published research already includes tomato, cucumber and lettuce. This does not mean identical responses should be expected in every cultivar or commercial growing system.

Section 09

Research References

[01]
Faisal et al. “Molecular hydrogen in agriculture.”
Plant Physiology and Biochemistry (indexed on PubMed), 2021
https://pubmed.ncbi.nlm.nih.gov/34420086/
[02]
“The Applications of Molecular Hydrogen in Horticulture.”
Horticulturae, 2021
https://www.mdpi.com/2311-7524/7/11/513
[03]
“Hydrogen-rich water enhances vegetable growth and fruit quality by regulating ascorbate biosynthesis.”
Plant Physiology and Biochemistry, 2025 · DOI: 10.1016/j.plaphy.2025.109790
https://www.sciencedirect.com/science/article/pii/S0981942825003183
[04]
“Hydrogen-rich water alleviates drought stress in tomato: Insights from physiological, molecular, and ionic perspectives.”
Scientia Horticulturae, 2025 · DOI: 10.1016/j.scienta.2025.114574
https://www.sciencedirect.com/science/article/pii/S0304423825006211
[05]
“Advances in hydrogen-rich water for plant abiotic stress management: antioxidant regulation, hormonal crosstalk, and signal integration.”
Frontiers in Plant Science, Volume 17, 24 July 2026 · DOI: 10.3389/fpls.2026.1898691
https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2026.1898691/full
[06]
“Research Progress of Hydrogen Rich Water in Preservation of Postharvest Horticultural Products: A Review.”
Journal of Agricultural and Food Chemistry, 2025 · DOI: 10.1021/acs.jafc.5c01207
https://pubs.acs.org/doi/10.1021/acs.jafc.5c01207
[07]
Review of hydrogen-rich water production, stability and application.
Frontiers in Food Science and Technology, 2024 · DOI: 10.3389/frfst.2024.1448148
https://www.frontiersin.org/journals/food-science-and-technology/articles/10.3389/frfst.2024.1448148/full

Section 10

Frequently Asked Questions

What is hydrogen-rich water for plants?: Hydrogen-rich water (HRW) is water containing dissolved molecular hydrogen (H₂). In plant research it is used as a delivery method for H₂ to the root zone or, in some studies, as a foliar treatment.
Can hydrogen-rich water be used for greenhouse irrigation?: Hydrogen-rich water can be applied through irrigation, and controlled-environment agriculture is a practical setting for evaluating it. Commercial greenhouse performance has not been established and requires crop-specific controlled trials.
What does hydrogen-rich water do to plants?: Published research reports effects on reactive oxygen species signalling, antioxidant systems, hormonal signalling, ion homeostasis and gene expression. These are reported physiological effects under experimental conditions, not guaranteed outcomes.
Does hydrogen-rich water improve plant growth?: Some studies report improved seedling vigor, photosynthetic efficiency and biomass accumulation, in at least one case at low HRW concentrations. Results depend on crop, hydrogen concentration, treatment method, water chemistry and experimental conditions.
Has hydrogen-rich water been studied in tomatoes?: Yes. A 2025 study in Scientia Horticulturae reported that HRW enhanced antioxidant capacity, reduced drought-associated damage, helped maintain water balance and affected gene expression, stomatal responses and root ion stability in tomato.
Has hydrogen-rich water been studied in cucumbers?: Yes. A 2025 study in Plant Physiology and Biochemistry reported increased vitamin C and soluble sucrose content in cucumber fruit alongside changes in genes associated with photosynthesis and antioxidant biosynthesis.
Has hydrogen-rich water been studied in lettuce?: Yes. Lettuce was one of three vegetable crops examined in the 2025 Plant Physiology and Biochemistry study on HRW and ascorbate biosynthesis, which reported improved seedling vigor and biomass accumulation at low HRW concentrations.
Can hydrogen-rich water help plants tolerate drought?: Research including a 2025 tomato study and the 2026 Frontiers in Plant Science review reports that HRW is associated with improved drought-stress responses. These are experimental findings and are not a guarantee of performance in commercial production.
Does hydrogen-rich water affect antioxidant systems in plants?: Antioxidant regulation is one of the most consistently reported themes in HRW research, including ROS regulation and antioxidant biosynthesis pathways, as synthesised in the 2026 Frontiers in Plant Science review.
How is hydrogen-rich irrigation water produced?: Hydrogen is dissolved into water at a hydrogenation point, for example by dissolution of hydrogen gas into an irrigation reservoir or an in-line treatment stage upstream of distribution. Achieved concentration depends on the method, pressure, temperature and residence time.
How long does hydrogen remain dissolved in water?: Dissolved H₂ has relatively low solubility and tends to move into the gas phase, so concentration falls over time. Retention depends on temperature, storage conditions, agitation and whether the system is open or closed.
Can hydrogen-rich water be stored?: Water can be stored, but the dissolved hydrogen concentration should not be assumed to remain constant. Concentration should be measured at the point of irrigation rather than at the point of hydrogenation.
What should be measured in a hydrogen-rich water greenhouse trial?: At minimum: dissolved H₂ concentration at the point of irrigation, water temperature, pH, EC, ORP and irrigation volume, alongside plant measures such as biomass, leaf area, photosynthetic performance, fruit number and mass, fruit quality and yield per square metre, against an untreated control.

Pilot-Scale Evaluation

Hydrogenation Equipment for Pilot Greenhouse Trials

Commercial PEM hydrogenation equipment for producing hydrogen-rich water is already available, providing a practical starting point for greenhouse operators, researchers and technology developers wishing to evaluate hydrogen-rich irrigation under controlled conditions.

For pilot-scale evaluation, equipment such as the HERO Bath provides continuous hydrogenation of water using PEM electrolysis. The equipment can be used to investigate hydrogen-rich water production, dissolved-hydrogen concentration, delivery and retention before considering a purpose-built higher-throughput irrigation system.

The equipment is commercially available for purchase through YBG Group's dedicated hydrogen-water equipment site.

View PEM Hydrogenation Equipment →

Product specifications and availability are provided on the equipment website. Suitability for a particular greenhouse irrigation application should be evaluated according to water volume, irrigation flow, dissolved-hydrogen concentration, residence time and delivery configuration.

Technical Enquiry

Discuss a Hydrogen-Rich Irrigation Trial

If you operate a commercial greenhouse and are interested in evaluating hydrogen-rich irrigation water under controlled conditions, contact YBG Industrial to discuss the water volume, irrigation system and potential trial configuration.

Contact YBG Industrial

This page summarizes published scientific literature and does not constitute a guarantee of crop yield, plant-health outcome or commercial performance. Results reported in controlled studies may not translate directly to commercial greenhouse production.