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  • 10 Best Indoor Plant Foods UK 2024 | Miracle-Gro, Gro-Sure and More 1
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10 Best Indoor Plant Foods UK 2024 | Miracle-Gro, Gro-Sure and More

To keep your indoor plants happy and healthy, you need to provide them with all the nutrients and minerals they need to grow big and strong. Potted house plants don't have the same access to the naturally occurring organic materials that outside plants do, so you'll need to make sure the soil is rich in nitrogen, phosphorous, and potassium.


Whether you have a collection of succulents or yukkas, an indoor spider plant jungle, or some simple flowerbeds to brighten up a room, we've picked the best indoor plant foods available in the UK to keep them healthy. We've included options from some of the top brands in the business, like Miracle-Gro, Baby Bio, and Marphyl, in liquid powder and pellet forms so that you can make the right choice for your plants! 

Last updated 26/03/2024
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Guide
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Table of Contents

How to Choose Indoor Plant Foods in the UK

Key Points to Consider
  1. Select a Food That Suits Your Plants, Budget and Convenience Level
  2. Pick the Right Food by Understanding the NPK Ratio
1

Decide on the Type of Plant Food Depending on Convenience, Value for Money and the Types of Plants You Have

Decide on the Type of Plant Food Depending on Convenience, Value for Money and the Types of Plants You Have

Use Liquid Plant Food for a Fast-Acting and Easy Way to Give Drooping Plants the Nutrition They Need

As liquid plant food penetrates the soil straight away, your plants will have immediate access to the nutrients, making it an excellent choice for plants that show visible signs of drooping when they need feeding. It's extremely easy to apply by simply adding a little food to the watering can when you water your plants.


Just make sure to follow the instructions carefully and check whether the plant food is a liquid concentrate that has to be diluted or can be directly applied. The strength of different liquid fertilizers can vary dramatically, and the amount will often depend on the types of plants you own, so getting the balance right can take a little getting used to.

Opt For Powdered Food if You Have Lots of Plants to Feed and Want to Save Some Money

Powered plant feed is similar to liquid concentrate due to the fact that you have to measure out the right amount, add it to some water, and then water your plants with it. It also tends to be the most economically beneficial option as they're often sold in large boxes and tubs that last a long time and can be easily tucked away in a cupboard.


The main drawback is that powdered plant food is an irritant and is more fiddly to prepare than the other options. It's recommended to use gloves when scooping out the powder, but you also have to make sure the correct amount is added and dissolved properly. However, if you have a lot of plants and are looking to save some money, it's the best way to go.

Pick Slow Release Pellets for a Convenient Way to Feed Plants That Don’t Require a Lot of Watering

If you don't fancy the hassle of mixing a liquid or powder into a watering can or are a little forgetful when it comes to watering your plants, you could opt for slow-release food pellets instead. This type of plant food is the most convenient as you just mix the pellets in with the soil, and you're done! These pellets also often last an entire season, from spring to spring, taking away the need for regular feeding.


With many things in life, this convenience does come with an added cost upfront, but when you consider how long they last, it's really not too bad. This works especially well for plants that don't need to be regularly watered, like succulents, air plants, snake plants, and cacti.


If you have a feline friend, consider picking up some cat-safe plants to brighten up your home!

2

Check the NPK Ratio of the Plant Food to Ensure You’re Picking the Right One for Your Types of Plants

Check the NPK Ratio of the Plant Food to Ensure You’re Picking the Right One for Your Types of Plants

One of the most confusing things about buying indoor plant food is trying to decipher the NPK ratio, which is the amount of Nitrogen (N), Phosphate (P), and Potassium (K) found in plant food. All plants require these three elements as they serve different purposes:


  • Nitrogen is responsible for healthy stem and leaf growth, making it extremely important for tropical plants with large leaves needing strong stems, like rubber plants and fiddle leaf figs.

  • Phosphate helps with everything under the soil, most notably a plant's root system. This is often more important when growing vegetables rather than house plants.

  • Potassium is crucial when growing flowers and fruits as it is responsible for their production but less important for plants that don't flower or produce fruit.

Find the right home for your plant with an indoor plant pot!

Was the Buying Guide helpful?

10 Best Indoor Plant Foods in the UK

This ranking has been compiled by the writing team at mybest UK via careful evaluation of the points made in the buying guide and thorough research of each product and comparing multiple verified customer reviews across the EC sites used.
Popularity
Products
Image
Click to purchase
Price
Key features
1

Miracle-Gro

All Purpose Water Soluble Plant Food

Miracle-Gro All Purpose Water Soluble Plant Food 1

£5.99

Mid

The Water Soluble Food From the Nation’s Best Selling Brand That Will Last for Ages

2

Miracle-Gro

All Purpose Continuous Release Plant Food

Miracle-Gro All Purpose Continuous Release Plant Food 1

£13.90

High Mid

A Slow Release Pellet Option With a Balanced NPK That’s Suitable for All Types of Plants

3

Baby Bio

Houseplant Food

Baby Bio Houseplant Food 1

One of the Best Budget-Friendly Liquid Concentrates for Promoting Greener Leaves

4

Marphyl

Marine Phytoplankton

Marphyl Marine Phytoplankton 1

£9.90

Mid

Non-Toxic and Sustainably Made Option Featuring Microalgae That's Great for Heathers and Ferns

5

Gro-Sure

6 Month Slow Release Plant Food

Gro-Sure  6 Month Slow Release Plant Food 1

£12.00

High Mid

An Affordable 2 kg Tub of Slow Release Pellets That Will Last You for Years

6

Miracle-Gro

Performance Organics All Purpose Liquid Plant Food

Miracle-Gro Performance Organics All Purpose Liquid Plant Food 1

£5.40

Mid

An Organic Option that's Great for Indoor Fruit and Veg and Is Child, Bee and Pet-Safe

7

Flower Power

Richard Jackson's Premium Plant Food

Flower Power Richard Jackson's Premium Plant Food 1

£29.99

High

A Large Tub of the Award-Winning Premium Powder That’s Fantastic for Flowers

8

Miracle-Gro

All Purpose Concentrated Liquid Plant Food

Miracle-Gro All Purpose Concentrated Liquid Plant Food  1

£7.00

Mid

A Great All-Purpose, Highly-Balanced Option Suitable for All Different Types of Plants

9

Miracle-Gro

Pump & Feed All Purpose Plant Food

Miracle-Gro Pump & Feed All Purpose Plant Food 1

£3.75

Low Mid

A Pump Option That Feeds Directly to the Soil and Is Quick, Convenient and Easy-To-Use

10

Phostrogen

All Purpose Plant Food

Phostrogen  All Purpose Plant Food 1

£6.39

Mid

A Bargain Offering That Promotes a Healthy Root System and Is Great for Sick Plants

If you don't see the product you're looking for, you can request that it be listed.
No.1

Miracle-GroAll Purpose Water Soluble Plant Food

All Purpose Water Soluble Plant Food 1
Source:amazon.co.uk
All Purpose Water Soluble Plant Food 2
Source:amazon.co.uk
All Purpose Water Soluble Plant Food 3
Source:amazon.co.uk
All Purpose Water Soluble Plant Food 4
Source:amazon.co.uk
Reference price
£5.99
Mid
Reference price
£5.99
Mid

The Water Soluble Food From the Nation’s Best Selling Brand That Will Last for Ages

If there's one name that stands out above all others, it's Miracle-Gro - the number one selling plant food in the UK. This 2 kg tub of water-soluble powder is an absolute bargain, as a single spoon will provide a litre's worth of nutrition.


This all-purpose food will give your plants luscious, healthy leaves and help keep them free from disease. If you're looking to grow extra-large leafy plants and flowers, you should definitely try this out!

Was this Ranking helpful?
No.2

Miracle-GroAll Purpose Continuous Release Plant Food

All Purpose Continuous Release Plant Food 1
Source:amazon.co.uk
All Purpose Continuous Release Plant Food 2
Source:amazon.co.uk
All Purpose Continuous Release Plant Food 3
Source:amazon.co.uk
All Purpose Continuous Release Plant Food 4
Source:amazon.co.uk
Reference price
£13.90
High Mid
Reference price
£13.90
High Mid

A Slow Release Pellet Option With a Balanced NPK That’s Suitable for All Types of Plants

If you enjoy having a house full of plants but aren't a fan of the upkeep, these all-purpose pellets from Miracle-Gro are perfect. One application at the start of spring is all you need for a whole six months.


Whether you're a fan of ferns or flowers, succulents or snake plants, this option will happily cover all sorts of indoor plants thanks to its balanced NPK. The packaging also happens to be made entirely of recycled materials!

No.3

Baby BioHouseplant Food

One of the Best Budget-Friendly Liquid Concentrates for Promoting Greener Leaves

When it comes to foods specific for houseplants, this liquid concentrate from Baby Bio is one of the best around at promoting healthy green leaves, thanks to its high nitrogen content. That means it's perfect for rubber, spider, and snake plants alike.


While the volume may seem small, you only need a few drops in half a litre of water, meaning that it's surprisingly long-lasting. It's also one of the cheapest at face value, making it a good choice if you only have a few houseplants.

No.4

MarphylMarine Phytoplankton

Marine Phytoplankton 1
Source:amazon.co.uk
Marine Phytoplankton 2
Source:amazon.co.uk
Marine Phytoplankton 3
Source:amazon.co.uk
Marine Phytoplankton 4
Source:amazon.co.uk
Reference price
£9.90
Mid
Reference price
£9.90
Mid

Non-Toxic and Sustainably Made Option Featuring Microalgae That's Great for Heathers and Ferns

Marphyl's Marine Phytoplankton is much more than your average plant food as it contains microalgae which are full of nutrients, vitamins, and minerals. These are harvested completely naturally and are vegan, non-toxic, non-GMO and sustainably made with no preservatives.


Organic plant foods don't have an NPK rating but are much safer than other alternatives for pets, small children, and bees. In the absence of NPK, you can check the pH rating, which is slightly acidic (between 6.2 and 6.5), making it good for heathers and ferns.

No.5

Gro-Sure 6 Month Slow Release Plant Food

6 Month Slow Release Plant Food 1
Source:amazon.co.uk
6 Month Slow Release Plant Food 2
Source:amazon.co.uk
6 Month Slow Release Plant Food 3
Source:amazon.co.uk
6 Month Slow Release Plant Food 4
Source:amazon.co.uk
Reference price
£12.00
High Mid
Reference price
£12.00
High Mid

An Affordable 2 kg Tub of Slow Release Pellets That Will Last You for Years

This 2 kg tub of slow-release plant food from Gro-Sure may be the best value for money on this entire list - it's no exaggeration that this will feed several plants for years and years. It's a great option if you have plenty of hanging baskets around the home that are difficult to water.


It's incredibly easy to use by mixing it with soil or simply sprinkling it around larger, already potted plants. The high potassium ratio also makes it especially good for flowers and any indoor fruit plants like tiny orange trees!

No.6

Miracle-GroPerformance Organics All Purpose Liquid Plant Food

Performance Organics All Purpose Liquid Plant Food 1
Source:amazon.co.uk
Performance Organics All Purpose Liquid Plant Food 2
Source:amazon.co.uk
Performance Organics All Purpose Liquid Plant Food 3
Source:amazon.co.uk
Performance Organics All Purpose Liquid Plant Food 4
Source:amazon.co.uk
Reference price
£5.40
Mid
Reference price
£5.40
Mid

An Organic Option that's Great for Indoor Fruit and Veg and Is Child, Bee and Pet-Safe

Another natural option is the Performance Organics All Purpose Liquid Plant Food from Miracle-Gro, which is bee, pet, and child friendly. As it's plant-based, it's suitable for vegans, and you certainly get plenty of bang for your buck as it goes a long way.


While it is suitable for indoor plants, it's best suited to fruits and veg, so if you have small fruit trees and the like, this is perfect. However, the smell is rather strong, so you may have to open a window after you're done!

No.7

Flower PowerRichard Jackson's Premium Plant Food

Richard Jackson's Premium Plant Food 1
Source:amazon.co.uk
Richard Jackson's Premium Plant Food 2
Source:amazon.co.uk
Richard Jackson's Premium Plant Food 3
Source:amazon.co.uk
Richard Jackson's Premium Plant Food 4
Source:amazon.co.uk
Reference price
£29.99
High
Reference price
£29.99
High

A Large Tub of the Award-Winning Premium Powder That’s Fantastic for Flowers

If you're a flower enthusiast looking to grow the biggest, brightest, and most beautiful, Richard Jackson's Premium Plant food will be your best friend. Flower Power fed plants have won over 80 Gold Medals and first prizes at tons of major flower shows including the prestigious Chelsea Flower Show.


As a premium plant food, this is a more expensive option and arguably better used on outdoor flower beds rather than indoors, but its quality is undoubted. The large 1.5 kg tub will also go a long way if you're worried about cost.

No.8

Miracle-GroAll Purpose Concentrated Liquid Plant Food

All Purpose Concentrated Liquid Plant Food  1
Source:amazon.co.uk
All Purpose Concentrated Liquid Plant Food  2
Source:amazon.co.uk
All Purpose Concentrated Liquid Plant Food  3
Source:amazon.co.uk
Reference price
£7.00
Mid
Reference price
£7.00
Mid

A Great All-Purpose, Highly-Balanced Option Suitable for All Different Types of Plants

This liquid concentrate from Miracle-Gro is an excellent option if you have plenty of greenery both indoors and outdoors. It often doesn't make sense to buy separately for different types of plants, and this is a very balanced option.


The liquid is pretty convenient to mix into a watering can, but the powder is very similar and represents better value if you're looking to cover a lot of plants both inside and out. However, if you're after a no-nonsense option for everything, then this is your best bet.

No.9

Miracle-GroPump & Feed All Purpose Plant Food

Pump & Feed All Purpose Plant Food 1
Source:amazon.co.uk
Pump & Feed All Purpose Plant Food 2
Source:amazon.co.uk
Pump & Feed All Purpose Plant Food 3
Source:amazon.co.uk
Pump & Feed All Purpose Plant Food 4
Source:amazon.co.uk
Reference price
£3.75
Low Mid
Reference price
£3.75
Low Mid

A Pump Option That Feeds Directly to the Soil and Is Quick, Convenient and Easy-To-Use

If you're looking for convenience, there aren't many better options than Miracle-Gro's Pump & Feed. You simply apply the feed directly to the soil with a single pump and then water afterwards - easy as that! 


While it is undoubtedly quick and easy to use, it works out to be quite expensive for what you get as, as at only 200 ml, it will run out almost as quick as you use it. Still, just like many products, paying for convenience can be well worth the time saved.

No.10

Phostrogen All Purpose Plant Food

All Purpose Plant Food 1
Source:amazon.co.uk
All Purpose Plant Food 2
Source:amazon.co.uk
All Purpose Plant Food 3
Source:amazon.co.uk
Reference price
£6.39
Mid
Reference price
£6.39
Mid

A Bargain Offering That Promotes a Healthy Root System and Is Great for Sick Plants

The Phostrophen All Purpose Plant Food is a solid budget option that promotes a healthy root system thanks to its high ratio of phosphate. This is important in warding off disease and other ailments.


When it comes to many popular indoor plants, however, phosphate is probably the least important ingredient in plant food. However, if you've noticed your plants show signs of drought and sickness, this is well worth picking up for the price.

Written and researched by David Sexton

Top 5 Indoor Plant Foods

No. 1: Miracle-GroAll Purpose Water Soluble Plant Food

No. 2: Miracle-GroAll Purpose Continuous Release Plant Food

No. 3: Baby BioHouseplant Food

No. 4: MarphylMarine Phytoplankton

No. 5: Gro-Sure 6 Month Slow Release Plant Food

View Full Ranking
The descriptions of each product are referenced from content available on manufacturer, brand, and e-commerce sites.
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