Wednesday Weed – River Water Crowfoot

River Water Crowfoot (Ranunculus fluitans)

Dear Readers, most of the ‘weeds’ that I’ve been writing about during this past year have either been common, widespread ‘weeds’ or garden plants, but this week I want to tell you about a plant that is both unusual and very local. River water crowfoot (Ranunculus fluitans) is a member of the buttercup family that needs a clean, fast-flowing stream with a stony bed, where the water is both alkaline and relatively nutrient-rich, without being polluted by nitrates from run-off. I was delighted to find a fine crop of the plant in the tiny river that flows through Milborne St Andrew in Dorset. I wrote a bit about it in Saturday’s post, but thought that it needed a bit more attention. After all, it’s not every day that you encounter a relative rarity.

River water crowfoot can have stems that are up to 20 feet long, with each stem bearing several of the pure white flowers. The leaves are all thread-like and submerged, and undulate in the water in a very pleasing way. In the film below, I am holding the camera still and the water is moving. It’s maybe best avoided if you have a tendency to motion sickness.


MIlborne St Andrew has long been a ‘watery’ kind of place – a few years ago the village was cut off by flooding from this very same stream (which is a tributory of the delightfully named River Piddle). The area outside the shop was under about a metre of water, and this required a thirty-mile detour for anyone eager to get to or from the nearest railway station at Moreton. Some folk would disregard the warning that the area was too deep to ford, even in a Land Rover, and much entertainment was to be had by watching as the inevitable happened, and local tractors had to be summoned to get the culprits out of their self-inflicted immersion. Fortunately, a lot of work has been done and, fingers crossed, the stream is now relatively well-behaved, and whatever changes have been made seem to not to have affected the water crowfoot.

Incidentally, the name ‘Milborne’ gives you a clue – any place name with ‘borne’ in the name refers to a small river in Anglo Saxon. ‘Winterbourne/borne’, as in ‘Winterbourne Whitechurch’, means a stream that only runs in winter. In these days of flooding, it would be well to do a spot of research before moving to one of these delightful Dorset villages – those Anglo Saxons knew a lot about geography.

The presence of water crowfoot is thought by some ecologists to indicate the site of a collapsed bridge or old ford, though why I have not yet worked out.

Why ‘crowfoot’ though? The leaves of other species of crowfoot do have something of a bird’s foot look about them, but not here. Is it because it was thought that the seeds were spread by crows (not that unlikely, as many other plants arrive in ponds and rivers when birds stop to drink)? Or is it because crows were seen feeding in meadows (they love the insects that used to inhabit cow pats before the animals were regularly dosed with antibiotics)? The name goes back to the Middle English ‘crou-fot’, so it has been around as long as those Anglo-Saxon place names.

River water crowfoot is endemic to Western Europe, and the UK has over twenty percent of the total population of the plant. While it is classified as ‘Least Concern’ here, it is considered Vulnerable in Sweden and Near Threatened in Switzerland. As with all water plants, factors such as pollution and changes in river management can eradicate a population overnight. It was good to see the plants in Milborne in such abundance and obvious good health.

It is difficult to look at the streaming green tresses of the river water crowfoot and not think of Ophelia, and indeed Gertrude mentions ‘crow-flowers’ when describing the ‘fantastic garlands’ that Ophelia made before her suicide. Millais’s painting of Ophelia shows some river water crowfoot at the bottom of the picture, although when I look at this painting I can’t help but remember the terrible cold that the model, Elizabeth Liddal, caught while floating in a bath over a period of four months.

Photo One from

Ophelia by Sir John Everett Millais,(1851-2) (Photo One)

River water crowfoot is an important part of the ecosystem of a stream, partly because it provides cover and refuge for all manner of fish fry, insect larvae and other small invertebrates. Less obviously, dense stands of crowfoot can actually alter the dynamics of a stream, causing it to drop sediment in places where the plant forces the flow of the water to slow down. This sediment then enables other plants to root, and increases biodiversity. In particular, caddis and mayfly larvae are able to thrive, and these in turn feed the juvenile trout and salmon that may live in the river. It’s not for nothing that mayflies are the models for many of the lures used by fly fishermen and women. This fascinating article goes into greater detail on how the humble crowfoot can change the whole dynamic of a chalk stream.

Photo Two by Aaron Gustafson at

Brown Trout (Salma trutta) – one of the fish that benefits from water crowfoot cover (Photo Two)

So, as I write this on a sunny, humid day, I turn to Edward Thomas, a poet who captured the English countryside in a way that is redolent of sunshine through trees and the song of birds, mixed with a deep melancholy. For those of you who might wonder what a sedge warbler sounds like (as I did), you can see and hear them at the link here.


This beauty made me dream there was a time
Long past and irrecoverable, a clime
Where any brook so radiant racing clear
Through buttercup and kingcup bright as brass
But gentle, nourishing the meadow grass
That leans and scurries in the wind, would bear
Another beauty, divine and feminine,
Child to the sun, a nymph whose soul unstained
Could love all day, and never hate or tire,
A lover of mortal or immortal kin.

And yet, rid of this dream, ere I had drained
Its poison, quieted was my desire
So that I only looked into the water,
Clearer than any goddess or man’s daughter,
And hearkened while it combed the dark green hair
And shook the millions of the blossoms white
Of water-crowfoot, and curdled to one sheet
The flowers fallen from the chestnuts in the park
Far off. And sedge-warblers, clinging so light
To willow twigs, sang longer than the lark,
Quick, shrill, or grating, a song to match the heat
Of the strong sun, nor less the water’s cool,
Gushing through narrows, swirling in the pool.
Their song that lacks all words, all melody,
All sweetness almost, was dearer then to me
Than sweetest voice that sings in tune sweet words.
This was the best of May—the small brown birds
Wisely reiterating endlessly
What no man learnt yet, in or out of school.

Edward Thomas (1915)


Photo Credits

Photo One from

Photo Two by Aaron Gustafson at





18 thoughts on “Wednesday Weed – River Water Crowfoot

  1. Fran and Bobby Freelove

    I have River Water Crowfoot in one of my ponds, admittedly it grows fast but it keeps the water wonderfully clear and the tadpoles love it. We both love the painting of Ophelia, you can see why it’s one of the most popular of the Pre-Raphaelite paintings in the Tate collection.

    1. Bug Woman

      I’ve tried to grow water crowfoot in my pond, but everything else seems to outcompete it – at the moment I’m battling the duckweed with some vigour. Do you have a pump or somesuch in your pond, Fran and Bobby? I thought that River Water Crowfoot needed a current, though some of the other species are happy in ponds.

      1. Fran and Bobby Freelove

        No i haven’t in that pond, it’s purely for my frogs and tadpoles but it seems to do fine, the tadpoles seem to feed on it, sit on it and use it for cover, it grows really fast, i do lead weight parts of it and put it in my other much bigger pond in the hope that the koi will leave the lillies alone but it never seems to stop them, sometimes i think i should cement them in (the lillies that is, not the koi)😄

      2. Bug Woman

        I am thinking that I should be dividing my water lilies, which have gone berserk this year, but it’s such a mucky job. My pond is about three or four feet deep in the middle, and goodness only knows what’s living down there….I did get into it in a wet suit a few years back, which entertained the neighbours no end.

  2. Sarah Ann Bronkhorst

    So good to get the chance to read some of Edward T’s poetry again, with that build-up of detail and odd wry tone.

  3. Lorraine Grant

    I went for a walk with my daughter on a lovely June evening. We looked at the river Frome in South Gloucestershire, near farmland, and there was river water crowfoot. I didn’t know what it was and it was so beautiful and unusual, so I did an internet search, and found this page

  4. Pingback: A Summer Meander in Milborne St Andrew | Bug Woman – Adventures in London

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