Granular vs Liquid Plant Food for Vegetables
Updated: October 2026
You are in the allotment shop in April, with a bed to prepare and a grow bag of tomatoes at home. Granular vs liquid plant food for vegetables comes down to where the crop will grow and how often you can get back to it. Granules stay in the soil for weeks. A liquid acts quickly and has to be mixed again. A controlled-release granule is sold to last months from one dose. This page settles the format, using Royal Horticultural Society guidance and the prices in our [vegetable fertiliser comparison](/hub/fertiliser-soil-and-bark-mulch/vegetable-fertiliser). The rate on your own pack still wins over any example here.
You are in the allotment shop in April, with a bed to prepare and a grow bag of tomatoes at home. Granular vs liquid plant food for vegetables comes down to where the crop will grow and how often you can get back to it.
You are in the allotment shop in April, with a bed to prepare and a grow bag of tomatoes at home. Granular vs liquid plant food for vegetables comes down to where the crop will grow and how often you can get back to it. Granules stay in the soil for weeks. A liquid acts quickly and has to be mixed again. A controlled-release granule is sold to last months from one dose. This page settles the format, using Royal Horticultural Society guidance and the prices in our vegetable fertiliser comparison. The rate on your own pack still wins over any example here.
Our top picks
| Badge | Product | Format | How you repeat it | Vegetables named | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Miracle-Gro Miracle-Gro All Purpose Liquid, 2 x 800 ml | Liquid concentrate | Every 7 to 14 days | Not in the bullets | 9.0 | about £7.98 | View offer |
 Miracle-Gro Miracle-Gro Performance Organics Fruit & Veg, 1 kg | Granules | Work in; lasts weeks | Yes, fruit and veg | 9.5 | about £7.99 | View offer | |
| Preis-Tipp |  Westland Westland Growmore, 8 kg | Granules | Every 4 to 6 weeks | Not in the bullets | 8.6 | about £16.95 | View offer |
On this page
How granules and liquids differ
The RHS describes liquid feed as quick, and as the format for containers and for a shortage you can already see. Dry organic feeds work more slowly. Controlled-release granules are made to last for months.
A tomato in a grow bag in June shows the difference with a measure. Miracle-Gro All Purpose Concentrated Liquid is half a cap per litre every 7 to 14 days. Westland Boost is spread once, at 50 g per square metre, with NPK 17.8-7-15.5 on the manufacturer page and a six-month claim on the listing. Granules on a wet leaf can scorch, so spread them around the base and water them in.
Beds and raised beds
On an open vegetable bed, a granule used as a base matches the way most plots are worked. You weigh a rate per square metre, rake it in before planting, and leave the bed for weeks. Westland's Growmore page gives 135 g per square metre before planting and 70 g on established plants.
Raised beds are tighter once the leaves meet. Granules catch on foliage, and that contact is how scorch starts. In a bed of about 1.2 m by 2.4 m already full of broad beans, a dilute liquid at the stem is easier to aim. Brush stray granules off the leaves and water them in. Timing for either format sits on the how to feed vegetables page.
Pots, grow bags and containers
Containers are where liquids and slow-release granules belong. A March granule that carries an open bed will struggle to carry a tomato grow bag through August on its own.
Which? grew larger flowering plants with liquid than with controlled release in a patio trial of pelargoniums and potatoes, at £3.20 per pot against 42p. Two reviewers said the 800 ml bottle looked part-filled, and Boost reviews often mention cracked tubs.
What each format costs per feed
Price per kilogram muddles the choice, because a concentrate and a granule are used in different amounts. On these listing prices one Growmore dressing is about 15p per square metre at 70 g, Boost about 29p at 50 g, and Performance Organics about 60p to £1.00 at 75 to 125 g. The Miracle-Gro liquid is about £4.99 per litre and has to be repeated. Mylushgarden.co.uk estimates £20 to £30 for a season of liquid against £8 to £10 for one slow-release dose, on a page that states no test.
Our recommendation
Use a granule as the base on open beds and on raised beds you can still rake. Use a liquid on pots, grow bags, and any plant already short of feed, if you will mix a can every 7 to 14 days. If you will be away in July, put a controlled-release granule in the containers instead.
The organic choice is separate, on the best vegetable fertiliser page. The Products Compared editorial team set this out on 15 October 2026 from RHS guidance and those listings, without a garden trial. A qualifying purchase can earn a commission at no extra cost to you.
Common questions
Is liquid feed better than granules for vegetables?
Liquid feed is the better format in a pot or grow bag when you can repeat the dose, and when you are correcting a shortage you can already see. The RHS describes liquids as fast and dry feeds as slower. On an open bed, a granule base usually fits better.
Which lasts longer, granules or liquid?
Ordinary granules are described as lasting weeks, and controlled-release granules as lasting months. The Westland Boost listing claims six months from one dose at 50 g per square metre. Liquid lasts until the next dose, every 7 to 14 days on the Miracle-Gro pack and every 10 to 14 days in Love The Garden's timetable.
Which is cheaper over a season, granules or liquid?
A litre of Miracle-Gro concentrate costs about £4.99 and has to be repeated, while one granule dressing is a single cost per square metre. A shop estimate of £20 to £30 against £8 to £10 comes from a page with no stated test.
Which format is better for raised beds?
Rake a granule in before planting while you can still see the soil. Once the bed is crowded, pour liquid at the base so granules do not sit on the leaves. One hobby guide uses liquid only in raised beds, and it cites no trial. The RHS still allows granules if you keep them off the foliage and water them in.
Which format is better for pots and grow bags?
Use a liquid or a controlled-release granule. The RHS suggests a liquid about every two weeks for fruit and vegetables in containers, starting about six weeks after planting. One spring dose of a bed granule struggles to carry a small volume of compost through summer watering. Choose liquid if you will mix it on schedule. Choose controlled release if the pots will be left for weeks.
Can I use both granules and liquid on vegetables?
Yes. Apply the granule once, then the liquid at the cap mark while a container crop is growing. Several Miracle-Gro retail pages suggest that pattern, and it matches the RHS split between a long feed and a quick one. Skip a second granule in the same month. On an open bed, add liquid only for a plant that is clearly short.
Related pages
Sources
Public UK and manufacturer sources used for this comparison; last accessed 15 October 2026.
- RHS, Fertilisers: Types and Uses (retrieved 15 October 2026)
- RHS, How to Feed Plants (retrieved 15 October 2026)
- The Fertilisers Regulations 1991 (retrieved 15 October 2026)
- Westland Garden Health, Growmore (retrieved 15 October 2026)
- Love The Garden, Miracle-Gro Performance Organics (retrieved 15 October 2026)
- Love The Garden, Miracle-Gro All Purpose Concentrate (retrieved 15 October 2026)
- Garden Health, Westland Boost Multi-Action Granules (retrieved 15 October 2026)
- Animal PoisonLine: Are fertilisers dangerous for dogs and cats? (retrieved 15 October 2026)