Natural fertiliser for vegetable beds and tomato pots

Updated: October 2026

An allotment bed in April and a growbag of tomatoes in July do not want the same pack.

An allotment bed in April and a growbag of tomatoes in July do not want the same pack. Natural fertiliser for vegetables is the crop-stage question: which of these nine listings name vegetables, fruit, or a tomato analysis, and which are a tonic or a lawn liquid. This page is from Peter F., the DIY and tools editor, on 21 October 2026. The listings are on the natural fertiliser comparison, read with RHS tomato and feeding pages. Nobody here weighed a truss. A qualifying Amazon purchase can earn a commission at no extra cost to you. A meal belongs in the bed. A 4:2:6 liquid belongs on a fruiting pot. Seaweed alone is the wrong tomato feed.

Our top picks

Badge	Product	Main job	Feed type	Dilution or ratio	Note	Price	Offer
Best overall	Maxicrop Maxicrop tomato 1 L	Tomatoes and greenhouse crops	Organic tomato liquid	4:2:6	9.2	about £11.99	View offer
Best value	Topline Topline fish, blood and bone 8 kg	General soil feed	Animal meal (fish, blood and bone)	1:0:0	9.2	about £18.98	View offer
Alternative	Topline Topline bone meal 4 kg	Root and planting feed	Bone meal	Not printed	9.2	about £11.99	View offer

Best overall

Maxicrop Maxicrop tomato 1 L

9.2/10about £11.99

View offer

Best value

Topline Topline fish, blood and bone 8 kg

9.2/10about £18.98

View offer

Alternative

Topline Topline bone meal 4 kg

9.2/10about £11.99

View offer

On this page

1.Beds need a meal and fruiting pots need potash
2.Which of these packs name vegetables or tomatoes
3.Seaweed is a top-up, not the tomato feed
4.What you cannot copy onto these packs

Beds need a meal and fruiting pots need potash

The Royal Horticultural Society says most gardens do not need routine fertiliser. Containers and many vegetables are the usual exceptions. A bed forked in spring can take a soil meal. A pot that is already fruiting wants a high-potassium liquid once the first fruits swell. Ground tomatoes in enriched soil may need little extra. Container tomatoes are fed every 10 to 14 days, and the RHS stops container feeding after September. A meal supplies the soil. A 4:2:6 liquid leans toward potash. A seaweed tonic sits beside either and does not replace them. Rates of 140 g per square metre, 70 g as a top dress, or 50 g per tomato plant are other brands, not Topline. Form, rather than crop stage, is the natural fertiliser buying guide.

Which of these packs name vegetables or tomatoes

Topline 8 kg at £18.98, 4.6 from 191, names vegetables and root crops. Reviewers put it under tomato plugs. There is no usable NPK. It is not vegan and not a potash liquid. Bone meal 4 kg at £11.99, 4.6 from 115, is phosphorus at planting, not once fruit has set. One reviewer used it on a lawn and saw nothing. Maxicrop tomato 1 L at £11.99, 4.6 from 402, is the only tomato analysis: 4:2:6, up to 200 L, OF&G in the bullets, Soil Association Approved on the highlight, also naming peppers, chillies and aubergines. The spout leaks and stains. Lawn liquids and Empathy are the wrong job, on best natural fertiliser.

Testsieger

Maxicrop Maxicrop tomato 1 L

9.2/10about £11.99

View offer

Seaweed is a top-up, not the tomato feed

Maxicrop 2.5 L at £18.99, 1:100, and Sunshine 6 L and 20 L at 1:400, are tonics. The RHS treats unstandardised seaweed as not a true fertiliser and Maxicrop as an extract that complements a feed. Use them for stress or a light top-up only if a meal or a tomato liquid is already in the programme. Do not use them as the only feed once tomatoes are fruiting. The 2.5 L file is 4.6 from 3,688. Sunshine has 8 and 9 reviews. Neither prints 4:2:6. A title that lists vegetables and lawns on the 20 L tub does not make it a tomato analysis. The format choice is seaweed fertiliser or fish, blood and bone.

What you cannot copy onto these packs

Topline 8 kg has no grams. Do not copy 50 g per tomato plant or 140 g per square metre from other brands. Shop lines of 20 ml per 4.5 L or 30 ml per 6 L are retailer copy. The listing is 4:2:6 and makes up to 200 L. An RHS line of 4–0.8–4.9 for Ireland and the EU is not this field. OF&G, control body GB-ORG-02, is a claim about the input, not a food logo. Natural on a title is a slogan. On 19 October 2026, bone meal and Maxicrop tomato were £11.99, Topline 8 kg £18.98, and Maxicrop seaweed £18.99. This is not a lab yield.

Common questions

Which of these packs is actually for vegetables or tomatoes?

Topline 8 kg as a bed meal, Topline bone meal at planting, and Maxicrop tomato 4:2:6 once fruit is the point. Seaweed is a top-up. Lawn liquids and Empathy are the wrong job.

Can I feed tomatoes on seaweed alone?

No. Maxicrop 2.5 L and Sunshine are tonics. The RHS does not treat them as a substitute feed. Fruiting pots want a high-potassium liquid once the first fruits swell.

When do I start a tomato liquid, at the first truss or the first swell?

The RHS starts a high-potassium liquid once the first fruits swell, and it feeds container tomatoes every 10 to 14 days. This listing does not print a first-truss line. Follow the bottle if it differs.

Is fish, blood and bone enough for fruiting tomatoes?

It can feed the bed. It is not a potash liquid. Reviewers put Topline under tomato plugs as a meal. Once fruit sets in a pot, Maxicrop 4:2:6 is the listing here that matches that stage.

Does OF&G on Maxicrop tomato make the fruit certified organic?

No. OF&G is a claim about the input. Certified organic food needs a control body for the holding and the crop. The Approved or Certified lines on the listing are not a food logo.

What rate do I use on Topline for a bed?

The listing has no grams. Water it in and do not exceed the rate on the sack. Do not copy 70 g or 140 g from another brand.

Are the lawn liquids any use on a vegetable plot?

Not as a vegetable feed. Safelawn and Maxicrop lawn are grass products. Use the bed meal or the tomato liquid instead.

Should I put Empathy in a tomato pot?

No. Empathy is an acer and shrub food with mycorrhizal fungi. A tomato pot is the wrong job, and a heavy feed on those fungi is the wrong stack.

How to use natural fertiliser