Hemp for Fishing

By Alex Clayton · Updated 23 October 2026

Hemp for fishing means feeding cooked hempseed: a small dark seed, soaked and boiled until the shells split to show white kernels. Fed in a carpet of tiny grains, it draws roach, dace, chub, barbel, bream and carp into a swim and keeps them grubbing there.

The trouble is the cooking advice. One guide says 20 minutes, another a night in a flask, and few tell you how to know when it is done. A simple doneness test settles it.

The Canal & River Trust (CRT) rates hemp as probably the best particle for holding roach in the peg, and says most canal match anglers carry it. Below is why hemp fishing works, how to prepare, feed and hook it, and which rules to check. For other options, see our coarse bait guides.

Why Hemp Works and Which Fish It Draws In

Hemp reached English angling with Belgian refugees during the First World War, and it worked so well that many clubs banned it, according to the Canal & River Trust.

The seeds are tiny and plentiful, so fish have to hunt for them and stay in your swim. Cooking splits the shells and releases oils, which is why the cooking water is worth keeping. Angling Times likens cooked hemp on the riverbed to small snails, a trade-press theory rather than proven science.

Species	Where	How hemp is used
Roach and dace	Canals, rivers	Loose feed; a single large seed on a small hook
Chub and barbel	Rivers	A bed of hemp on the riverbed
Bream	Canals, lakes	A bed of hemp with caster
Carp	Lakes	A bed of bait, spods, method mix or paste

See our guides to roach fishing and barbel fishing.

Hemp has limits. The CRT says no miracle bait exists, Angling Times calls hooking the seed fiddly, and it is easy to over-feed.

Best for: silverfish, plus barbel and chub swims on rivers. Skip it if: you want one big hook bait and no feeding.

Why Hemp Must Be Soaked and Cooked Before You Fish It

Nearly every guide tells you never to use raw hemp, yet hardly any explains why. One forum thread asks exactly that, and the replies never agree.

It floats. Dry seed floats or washes straight out of the swim, as both Angling Times and Angling Direct point out. Soaked, cooked seed sinks and stays where you put it.

It splits. Cooking opens the shell to show the white kernel. That releases the seed’s oils and gives you a split to hook through.

It cannot sprout. Angling Times says hemp sold in tackle shops has been heat-treated and cooked so it cannot grow. That is a trade-press claim; no official source for it turned up. If you buy dry seed from anywhere, cook it fully.

The other claim you will read is that raw hemp swells inside fish and harms them. It rests on forum anecdote, and there is no good evidence either way. Cooking the seed makes the question irrelevant.

The verdict: whatever the truth about raw seed, cooked seed sinks, splits and hooks. Raw seed does none of those.

How to Prepare Hemp: Saucepan and Flask Methods

Stop watching the clock and look at the seed. When most shells have split to show a white kernel, your hemp is ready.

Saucepan method

Riddle the dry seed to remove dust, stalks and debris.
Soak it in cold water before cooking; many anglers leave it overnight.
Put 1 mug of seed in a pan with 4 mugs of water.
Optionally add 1 teaspoon of bicarbonate of soda, as Angling Direct’s recipe does.
Bring to the boil and keep it boiling for roughly half an hour, until the shells split.
Drain and rinse under the cold tap.
Keep the cooking water. Its oils and sugars suit groundbait or stick mixes.

Some guides use a slow cooker instead. If you do, judge it by the doneness test rather than a set time.

Flask method

The CRT suggests filling a flask with about 70% hemp and 30% boiling water the night before. Angling Times gives a quicker version: fill the flask three-quarters full of dry hemp, top up with boiling water, shake and leave for an hour. Check for splits before use. A flask suits small amounts and keeps the smell down.

That smell matters. The CRT warns that non-fishing members of the household may object, which is putting it politely. Cook outdoors on a gas burner, as Angling Direct suggests, or buy ready-cooked.

Method	Best for	Downsides
Saucepan	Large batches, lowest cost	Smell, takes time
Flask	Small amounts, overnight prep	Small batches only
Ready-prepared (frozen or tinned)	No prep at all; tins keep a long time unopened	Dearer than raw

The doneness test: shells split, white kernel showing, seeds sink. Few splits means keep going. Mushy kernels will not stay on a hook, so drain as soon as most seeds have opened.

If you need a pint for the weekend, cook a batch in the saucepan midweek and freeze it in session bags. Once you know how to prepare hemp, the same soak-and-boil routine opens up most other particle baits.

How Much Hemp to Feed and How to Get It in the Swim

Put in too much hemp and the roach compete so hard that the bites come too fast to hit. The CRT warns about exactly this.

For canal fishing, the CRT says half a pint of hemp is enough for most sessions. On rivers and carp lakes you will need more, and the amount rises with the flow and the species you are after.

Match the delivery to the water:

Catapult: little and often for roach, as Angling Times recommends.
Pole cup: for accuracy on canals and short pole lines.
Bait dropper: where the flow would carry loose feed away, per Angling Times.
Spod or method mix: for carp, as Angling Direct describes.

Feed hemp on its own. Angling Times notes it does not mix well into groundbait, so loose-feed it rather than balling it in. The cooking water from the saucepan method can still wet your groundbait.

A useful CRT tip: fire in a few grains now and then, because the splash keeps roach feeding. Uneaten bait sits on the bottom, so feed for the fish in front of you rather than the fish you hope will arrive.

Quick comparison: canal roach want little and often, with half a pint lasting the session. River barbel want a bed laid accurately with a bait dropper.

Hooking Hemp and the Best Hook Baits to Fish Over It

A single seed looks too small to bother with, yet big roach and dace will often take one large grain on a small hook, according to the CRT.

To hook a single grain of hemp:

Pick a large, well-split grain.
Push a small fine-wire hook into the flat base.
Roll the grain round onto the bend so the point shows through the split.

The CRT also describes “pinning the bud”: make a hole in the shell with a pole float stem, then pass the hook point through. Angling Times admits hooking hemp is fiddly.

Most anglers do better with a bigger bait over a hemp feed. Angling Times lists these:

Tares: prepared like hemp, soaked overnight and boiled until soft.
Caster: the classic partner. See maggots and casters.
Sweetcorn: see sweetcorn for fishing.
Luncheon meat: the largest bait of the five.
Small pellets: see our guide to fishing pellets.

Switching to a tare on the hook once fish are feeding on hemp is a long-standing canal and river approach.

Best for: hemp on the hook for wary roach. Switch to: caster or tare over hemp when bites are coming fast.

Is Hemp Banned? Checking the Rules on Your Water

Hemp has been banned before. As covered above, clubs did it because the seed worked too well.

No national hemp ban turned up in research. The GOV.UK freshwater rod fishing rules say national and local byelaws apply and that privately owned waters set their own rules. That page does not mention hemp or particles, so do not assume it is allowed everywhere.

Before you feed hemp, check:

The fishery or club rules: the day ticket, club book and lakeside signs.
Environment Agency local byelaws for the river or area, in England.
The Canal & River Trust or the angling club that controls the canal stretch.

Wales, Scotland and Northern Ireland have their own authorities and rules, so check with the relevant one. Some fisheries restrict particle baits, so read the rules for each water.

In England you also need an Environment Agency rod licence from age 13. See our guide to the fishing licence.

If the rules do not mention particles, ask the bailiff or club before you feed. Check with the fishery before you travel.

Frequently asked questions

Is hemp seed legal to use as fishing bait in the UK?

Yes. Section 37 of the Misuse of Drugs Act 1971 excludes seed separated from the cannabis plant from its definition of cannabis, so hemp seed bought for fishing is not a controlled drug. Do not try to grow it. Individual fishery bait rules still apply, so check the rules for each water you fish.

Can you use hemp from a bird-seed shop for fishing?

Yes. Dry hemp is sold by bird-feed merchants, as Angling Times notes, and it is usually the cheapest form. Soak and cook it fully before you fish with it, exactly as for tackle-shop seed. The saucepan method on this page shows how to prepare hemp.

Does hemp work for carp?

Yes. Angling Direct describes hemp for carp as a bed of bait on the lakebed, in spods, in method mixes or as a paste. Use it as the attractor and fish a bigger hook bait, such as a pellet or sweetcorn, over the top.

How long does cooked hemp for fishing last?

Cooked hemp keeps for a couple of days in the fridge before it can go rancid, according to the CRT. For longer storage, freeze it in session-sized bags and thaw one the evening before you fish. Unopened tins of ready-prepared hemp keep far longer.