Microbe Life Photosynthesis Plus – 1 Gallon

Microbe Life Photosynthesis Plus – 1 Gallon is a liquid microbial culture concentrate from Microbe Life Hydroponics. It contains a novel consortium of stable microorganisms that improve a plant’s conversion of carbon dioxide to available carbon, supporting energy production at both the foliar level and the root zone. The 1-gallon size is well suited for commercial and large-scale hobby operations where regular application to multiple plants or reservoirs is needed.

Photosynthesis Plus Specifications

The table below summarizes the key specifications for Microbe Life Photosynthesis Plus in the 1-gallon format, drawn from supplier data and the manufacturer’s product description.

Specification	Value
Brand	Microbe Life Hydroponics
Product Name	Photosynthesis Plus
Container Size	1 Gallon (128 fl oz / approx. 3.785 L)
Product Form	Liquid concentrate
Shipping Weight	9.01 lb (4.09 kg)
Supplier SKU	PH21228
Application Methods	Foliar spray; root zone drench
Category	Nutrients & Additives — Growth & Bloom Boosters

Why Choose Photosynthesis Plus

Photosynthesis Plus addresses plant nutrition at a biological level. Rather than adding conventional macro- or micronutrients, it introduces a stable community of microorganisms that interact directly with the plant’s own metabolic processes. Here is what distinguishes it from standard nutrient additives:

• Targets CO₂ conversion directly. The microbial consortium in Photosynthesis Plus improves the plant’s ability to convert carbon dioxide into available carbon. That carbon fuels cellular processes that support overall growth and development, including the production of sugars used during flowering.
• Works at both the foliar level and in the root zone. The culture can be applied as a foliar spray to support leaf-level photosynthetic activity, and it also colonizes the root zone, giving it two distinct points of effect in the growing system.
• Establishes biology rapidly, even in sterile media. In hydroponic, coco coir, or other media that start out largely free of microorganisms, Photosynthesis Plus quickly establishes the plant-supporting biology that would otherwise be absent. This is particularly relevant for growers running clean, sterile systems who still want the benefits of a microbial program.
• Supports the plant’s own photosynthetic machinery. Rather than replacing the plant’s biological functions, the product works in conjunction with existing photosynthetic processes, helping the plant optimize what it can already do rather than forcing an artificial response.
• 1-gallon volume suits regular commercial use. The gallon format reduces per-application cost and minimizes how often containers need to be replaced in high-frequency feeding programs.

Best Uses for Photosynthesis Plus

Photosynthesis Plus fits into programs where growers want to support plant vigor through biology rather than additional synthetic inputs. The following use cases reflect the application methods and growing contexts described by the manufacturer:

• Hydroponic and recirculating systems. Applied to a nutrient reservoir, the microbial culture reaches the root zone with each irrigation cycle. This is a practical entry point for growers who already manage reservoir top-offs and feeding schedules.
• Coco coir and peat-based media. These substrates start relatively low in beneficial organisms. Adding Photosynthesis Plus during early vegetative growth helps establish a microbial environment that supports nutrient availability and root development throughout the cycle.
• Soil and amended beds where microbial diversity is a goal. For growers using living soil or who want to avoid disrupting a developing microbial community, Photosynthesis Plus introduces stable organisms that complement rather than compete with an existing soil food web. Pairing it with a dedicated root stimulant like Heavy 16 Roots can support both microbial and structural root development simultaneously.
• Foliar applications during vegetative and early bloom. Sprayed directly onto leaf surfaces, the culture supports the leaf-level photosynthetic processes described in the manufacturer documentation. This is particularly useful during periods of high light demand or environmental stress.
• Starting clones and seedlings in sterile media. Young plants in rockwool, rapid rooter plugs, or similar inert media benefit from early microbial inoculation. Photosynthesis Plus can be introduced at this stage to begin building biological support before transplant.
• Supplementing existing nutrient programs. Because Photosynthesis Plus works through biology rather than direct nutrient input, it can be added alongside most base nutrients and other supplements without significant interaction concerns. Growers using Advanced Nutrients Tarantula or similar microbial additives may use it as a complementary product covering the foliar layer.

Photosynthesis Plus vs Similar Products

The closest alternate supplier listing for this product is available through Grow Wiser Garden Supply at $85.49 for the same 1-gallon SKU (PH21228). Both listings represent the same Microbe Life Photosynthesis Plus product. The difference is supplier pricing rather than any difference in formulation or volume.

More broadly, Photosynthesis Plus occupies a specific category: microbial culture concentrates that target carbon metabolism and photosynthetic support. This distinguishes it from enzyme-based additives, which focus on breaking down dead root matter and organic compounds in the root zone, and from mycorrhizal inoculants, which primarily enhance phosphorus uptake through root colonization. Photosynthesis Plus is positioned as a culture that affects the plant’s carbon conversion pathway, which is a different mechanism from nutrient-solubilizing microbes or beneficial fungi.

Growers choosing between Photosynthesis Plus and a general-purpose microbial additive should consider whether they want broad-spectrum root zone biology or a product specifically targeted at supporting the photosynthetic process. If the goal is maximizing root structure and colonization alongside microbial support, combining Photosynthesis Plus with a root-focused inoculant may be more effective than using either product alone.

Compatibility

Photosynthesis Plus is described as functioning in media that is void of organisms, which means it is designed to tolerate the clean conditions typical of hydroponic and soilless grows. The manufacturer’s description indicates the product works across both foliar and root-zone applications, which covers the two main delivery methods in controlled-environment horticulture.

The product is a liquid concentrate, making it compatible with standard dosing equipment including graduated syringes, pump dispensers, and reservoir injectors. It is in the Growth & Bloom Boosters category, meaning it is intended for use throughout the growing cycle rather than being restricted to a single phase.

Growers running organic or biological programs may also find it compatible with other carbon-based amendments. For example, a molasses supplement such as Earth Juice Hi-Brix Molasses can provide a carbohydrate energy source that feeds the microbial populations introduced by Photosynthesis Plus, supporting colony establishment in the root zone.

Note: specific pH compatibility range, EC interaction data, and exact chemical compatibility with all nutrient brands are not published in the available manufacturer documentation for this product. Growers running sensitive systems should test at low dose in a small batch before committing to a full program.

Dosing Guidelines

The canonical product description does not include specific dose rates per gallon or milliliter targets for this product. The following guidelines reflect standard practice for liquid microbial concentrate applications in the Nutrients & Additives category and should be verified against the manufacturer’s current label before use:

1. Shake the bottle thoroughly before each use. Microbial cultures can settle, and consistent distribution within the liquid is important for accurate dosing.
2. Measure the recommended dose using a calibrated syringe or measuring cup. Microbial concentrates are typically applied at low volumes per gallon of water — refer to the label for the current rate for Photosynthesis Plus specifically.
3. For reservoir applications, add the measured dose to your reservoir after pH-adjusting the base water. Mix the reservoir thoroughly before distributing to the root zone.
4. For foliar applications, dilute the concentrate in clean water per the label rate, apply to leaf surfaces during the lights-on period when stomata are open, and ensure even coverage on both upper and lower leaf surfaces.
5. Monitor plant response over the first two application cycles. Adjust frequency based on plant vigor and visible root zone health rather than increasing concentration beyond the label recommendation.
6. Maintain application consistency through both vegetative and bloom phases, since the manufacturer describes the product as supporting plant biology across growth stages rather than being a single-phase additive.

If you have the physical product label or current manufacturer documentation, use those dose rates as the primary reference. Label rates supersede general category guidelines.

Sources & Further Reading