MARPHYL Organic Liquid Plant Food, 500ml

1 / 7

Product guide

MARPHYL Organic Liquid Plant Food, 500ml

MARPHYL Organic Liquid Plant Food is a concentrated liquid fertiliser and soil enhancer for indoor and outdoor growing. The listing says to dilute one part product with 20 parts water, and names gardens and hydroponics among its uses.

At a glance

Made with marine phytoplankton, according to the listing.
The manufacturer describes macro- and micronutrients intended to support growth, roots, foliage, blooms and soil quality.
Listed for houseplants, flowers, vegetables, lawns, gardens and hydroponic systems.

Price

£12.66Save 37%

Reference price: ~~£19.99~~

Price checked: 12 Nov 2026

View offer Ahead of Black FridayExplore the selection

Often bought together

Houseplant Focus Repotting Mix, 3L - Growth Technology Potting Soil for Indoor Plants - Peat-Free Compost Soil - Professional Grade House Plant Food, Brown

£4.95

Growlands Indoor House Plant Food - 300 ml - Indoor Plant Liquid Spray Fertilizer - With Seaweed Extract - Designed For Use on All Plants - Ready to Use Mist Spray

£12.99

Pros and cons

Pros

A single liquid concentrate is listed for indoor and outdoor plants as well as hydroponics.
The stated 1:20 dilution gives a clear mixing guide, and customer feedback describes the product as easy to use.

Technical specifications

9 specifications

Identity
Brand	MARPHYL
Model	500ml

Format and application
Form	Liquid
Application method	Water Soluble
Mixing ratio	1:20
Liquid volume	16.9 Fluid Ounces

Use
Coverage	Vegetable gardens, indoor and outdoor gardens, hydroponics
Target species	All Plants

Dimensions and installation
Weight listed	0.53 Kilograms

What to know before buying

The manufacturer recommends feeding most plants every two weeks, while cacti and succulents or other plants needing less water may be fed monthly or every month and a half. Customer feedback is divided on the smell and value, so those preferences may matter when choosing a liquid feed.

What’s in the box

Included

Organic liquid fertiliser

Who is it for?

A good fit for

Gardeners wanting one diluted liquid feed for a range of indoor and outdoor plants.
Hydroponic growers looking for a plant-food product listed for hydroponic systems.
Buyers comfortable measuring and mixing a concentrate into water.

Less suited to

Anyone who needs a ready-to-use spray rather than a product that must be diluted.
People who are particularly sensitive to product odour, given mixed customer reactions.

MARPHYL Organic Liquid Plant Food, 500ml · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 13,219 ratings

5 stars63%63%
4 stars19%19%
3 stars12%12%
2 stars3%3%
1 star3%3%

Customer feedback describes the fertiliser as effective and easy to use, with reports of new growth and greener, glossier leaves. This is customer-reported experience rather than a guaranteed result. Reactions to the smell are mixed, as are opinions on value, which may be relevant for a product used regularly and diluted before application.

Positive themes

Customers report ease of use and visible plant growth, including new leaves and greener or glossier foliage.

Mixed feedback

Customers disagree about whether the product offers good value.
Reactions to the smell range from acceptable to strongly unpleasant.

Frequently asked questions

How do you dilute MARPHYL Organic Liquid Plant Food?

The listed mixing ratio is 1:20. The manufacturer describes mixing one part MARPHYL with 20 parts water before application.

How often does the manufacturer recommend applying it?

The listing recommends every two weeks for most plants, flowers and vegetables. For cacti, succulents and plants needing less water, it suggests monthly or every month and a half.

Which plants and growing systems is it listed for?

The listing names indoor and outdoor plants, vegetable gardens, lawns and hydroponic systems, and describes it as suitable for all plants.