• Plagron Hydro A and Hydro B 1 litre bottle set
  • Plagron Hydro A and B hydroponic nutrient bottles and canisters
  • Plagron Hydro A and Hydro B 5 litre canister set
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Plagron Hydro A&B Two-Part Hydroponic Base Nutrient Set

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£15.00
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size: 1 LTR

Plagron Hydro A&B is a two-part mineral base nutrient for plants grown in hydroponic systems. The matched Hydro A and Hydro B concentrates provide nutrition throughout both the growing and flowering phases. The formula is designed for hydroponic growing media such as clay pebbles and rockwool.

Use equal amounts of Hydro A and Hydro B with each irrigation. Plagron’s maximum dosage is 2.5 ml of Hydro A plus 2.5 ml of Hydro B per litre of water. Add the two concentrates to water separately and mix thoroughly between additions.

Why Choose Plagron Hydro A&B?

  • Two-part base nutrient for hydroponic growing
  • Suitable for both growth and flowering
  • Provides primary nutrients and trace elements
  • Formulated for use with inert hydroponic growing media
  • Hydro A and Hydro B are measured in equal amounts
  • Can be used as the base of a Plagron hydroponic feeding programme

How to Use Plagron Hydro A&B

  1. Shake both containers well before use.
  2. Fill the reservoir or watering container with water.
  3. Add the required amount of Hydro A and mix thoroughly.
  4. Add the same amount of Hydro B and mix again.
  5. Check the finished nutrient solution and adjust it as needed for the plants and system.

Use the prepared solution each time plants are irrigated. Do not mix the undiluted A and B concentrates directly together. Follow an appropriate feeding schedule when choosing a dose below the manufacturer’s maximum.

Plagron Hydro A&B Dosage

Water volume Maximum Hydro A Maximum Hydro B
1 litre 2.5 ml 2.5 ml
5 litres 12.5 ml 12.5 ml
10 litres 25 ml 25 ml
20 litres 50 ml 50 ml
50 litres 125 ml 125 ml

The table shows maximum quantities, not a fixed dose for every growth stage.

Product Details

  • Product type: Two-part mineral hydroponic base nutrient
  • Hydro A NPK: 3-0-1
  • Hydro B NPK: 1-3-6
  • Maximum mixing rate: 2.5 ml of A and 2.5 ml of B per litre of water
  • Use: Growing and flowering phases
  • Available set sizes at SteelRoots: 1 litre and 5 litre

Frequently Asked Questions

Is Plagron Hydro A&B used during both growth and flowering?

Yes. Hydro A&B is a base nutrient designed for both phases. Adjust the amount used according to the feeding schedule and the needs of the plants.

How much Hydro A and Hydro B should be added per litre?

Use equal amounts of both parts. Plagron states a maximum of 2.5 ml Hydro A and 2.5 ml Hydro B per litre of water.

Why are Hydro A and Hydro B in separate containers?

The two parts are kept separate as concentrates. Add Hydro A to water and mix before adding Hydro B; do not combine the undiluted concentrates directly.

Can Hydro A&B be used with Plagron additives?

Yes, compatible additives can be incorporated into a feeding programme. Follow each product’s instructions and check the strength of the finished nutrient solution.

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  • Vendor:

    PLAGRON

  • Type:

    BASE NUTRIENTS

  • Tags: Plagron
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Precision Nutrition for Hydroponic Growing

Take control of your hydroponic feed with Plagron Hydro A & B, a highly concentrated two-part base nutrient designed to support plants through both vegetative growth and flowering.

The complementary A and B formulas provide a complete nutrient profile, including quickly absorbable chelated trace elements. Hydro A delivers calcium to support strong plant development, while Hydro B supplies magnesium to aid chlorophyll production and healthy growth.

Developed for inert substrates and hydroponic cultivation, Hydro A & B gives experienced growers precise control over nutrient strength, EC and pH while providing consistent mineral nutrition from start to finish.

Shop Hydro A & B

Frequently Asked Questions

Plagron Hydro A & B is a complete two-part mineral base nutrient for hydroponic growing. Unlike separate grow and bloom feeds, the A&B combination can be used throughout both the vegetative and flowering stages, providing plants with essential macro and micronutrients throughout the cycle.

Plagron recommends a maximum of 2.5 ml of Hydro A per litre of water, together with exactly the same quantity of Hydro B. This gives a mixing ratio of 1:400, making the concentrated formula economical to use.

The two components complement one another to create a complete nutrient solution while keeping certain concentrated mineral elements separate before dilution. Hydro A is particularly rich in calcium, while Hydro B supplies additional magnesium alongside its NPK nutrients. Always add equal quantities of A and B to your water as directed.

Hydro A & B is designed for inert substrates used in hydroponic cultivation. Plagron's 100% HYDRO programme pairs it with Euro Pebbles. While Hydro A & B can work with Plagron Cocos Perlite 70/30, Plagron recommends Cocos A & B as the base nutrient for that particular coco substrate.

Yes. Hydro A & B is designed for growers who want close control over their nutrient solution. Plagron recommends monitoring both EC and pH and advises a pH range of 5.5–6.5 for its 100% HYDRO programme. The appropriate EC will vary according to the plant and its stage of development.

Yes. Plagron's 100% HYDRO schedule combines Hydro A & B with selected Universal additives. Its recommended programme includes Hydro Roots during early development, Power Buds during flowering and Green Sensation later in bloom, allowing you to build a more complete hydroponic feeding schedule around the A&B base nutrients.