Thorn

'Ne’er cast a clout ‘til  May be out'....We are fortunate to have two naturally occurring native species of Thorn on the Common.

 

Blackthorn in April 2020

Ne’er cast a clout ‘til  May be out. We are fortunate to have two naturally occurring native species of Thorn on the Common.

Hawthorn (Crateagus monogyna), also known as May, can reach a height of about 15m. It is the only tree specifically linked to a month of the year. Traditionally flowering around May Day, in a profusion of white, following the earlier appearance of small, maple-like leaves, it will be interesting to observe if this timing alters with environmental and climatic changes.

The leaves are deeply lobed and quite small at 4-6cm long. The bark is reddish brown and breaks into rectangular platelets, while the trunk (which may be single or multiple) often has a knotted, fissured and wizened look. Its highly dense, pale pink wood is useful for turnery (for handles, boxes, even boat parts), as well as having high fuel value for wood and charcoal.

Fruits appear in clusters of red berries (‘haws’) later in the year, remaining until Spring, unless eaten by birds. Haws can upset our own stomachs if eaten raw but when cooked – often with the vitamin C-rich rose hips – and sieved to create a jelly, they are a source of vitamins and antioxidants. Seeds have such a tough outer shell that they need to be in the ground for two winters before the tiny root (radicle) can break through and start a new plant.

Around the Common, you can find hawthorns in hedges and as individual trees. The tree in the main photo has five large trunks and with the largest having a 1.2m girth at 1.2m from the ground, is designated ‘significant’. From this we estimate its age at 160-240 years, making this magnificent tree a strong contender for one of the oldest on the Common.

Blackthorn (Prunus spinosa) or Sloe, tends to grow as more of a bush and rarely exceeds 5m in height. Left unmanaged, blackthorn spreads by suckering, creating large thickets that can be seen in at least four parts of the Common (this means that rooted whips can be sourced and transplanted very easily in winter).

Large drifts of Blackthorn’s white flowers are among the first to herald the coming of Spring and appear several weeks before Hawthorn flowers, as in the above photo, taken in March 2020. Blackthorn differs from Hawthorn in that its flowers appear long before its small, elongated, oval and toothed leaves. With sharp thorns along each twig that itself ends in a pointed thorn, blackthorn can be a vicious plant, as any gardener or woodsman caught by its thorns will confirm. The bark is dark brown, smooth and in winter the twigs look black and spiny.  The wood is tough and yellow, traditionally used for walking sticks and in Ireland, for shillelaghs.

The familiar fruits (sloes) are dark blue/black. Sloes are thought to be the crop-wild ancestors of our domesticated gages, damsons and plums.  They are extremely sour, full of tannins (another antioxidant) and used to infuse gin – wonderful for warming a cold winter work party (a much-appreciated FoBC tradition instigated by an early volunteer, Dennis Brown).

Hedging:  Both species have traditionally been used in hedging because as mentioned, they form a thorny and impenetrable barrier that is very useful for stock control (a possible an inspiration for barbed wire).  The ease of propagation and speed of growth for hedging led to the common name ‘Quickset’ and is applied to either species, but especially hawthorn.

A managed hedge will thicken when trimmed. Gaps at lower levels can be filled by hedge-laying (the craft of partially cutting and bending over the trunk, weaving it between stakes, typically of hazel – often planted along with blackthorn in a hedge.  So long as the stems have not been wholly cut through, the plant will re-shoot with new verticals, giving fresh life to the hedge as an effective barrier.

Putney Boundary: Competition between land, people and animals is not a new thing. In 1594, as the population began to recover from the effects of the Black Death, there was massive rivalry over grazing between residents of Putney and Barnes, when ‘heads were broken’ (someone was killed). This event led Queen Elizabeth I to order a boundary ditch be dug and a hedge planted to stop cattle (a term referring to any domestic animal owned as a chattel: cows, pigs and sheep) from crossing the boundary.  Is the thicket of blackthorn near the boundary today a remnant of that original hedge? I certainly like to think so!

Biodiversity: Blackthorn is the food plant for numerous moths and other invertebrates, as well as where rare brown and black hairstreak butterflies lay their eggs. We have also seen eggs of the blue-bordered carpet moth on our blackthorn, which can be confused with the eggs of the brown hairstreak. Its early flowering provides a vital nectar source for pollinators. Hawthorn hosts more than 300 insects and its profusion of berries supports many migrating as well as local birds.

Mythology and beliefs: Hawthorn are deeply rooted in our pastoral/pagan past (the term ‘pagan’, only recorded in English from around 1375, derives from Latin ‘paganus’ meaning rural or rustic and originally had no religious connotation). Hawthorn is a symbol of spring and fertility, its leaves providing the wreath or garland of the Green Man.  In one tale,  its petals formed the Milky Way.  Pre-Christian Celtic culture revered the hawthorn and in Ireland it is associated with the Faery Queen and the Little People. Traditions still hold strong today. As recently as 1999, a single hawthorn bush brought the building of a motorway to a halt in Co Clare, necessitating a deviation. In England it is more associated with love and the arrival of Summer, with special mention for the Glastonbury thorn.

Thorns also have a dark side in mythology. Blackthorn has a long association with ‘witchcraft’, purported to provide wands and staffs for witches. Trees can appear gnarled giving rise to the name ‘witches’ broom’ for gall-induced changes in growth. There is also a superstition that you must not bring hawthorn into the home, as it will bring disease because it was said to ‘smell of the Plague’. Interestingly, science has established that hawthorn blossom contains trimethylamine, a chemical which is one of the early releases when animal tissue decays – so there was good reason for the relationship, even if that is unfair on the hawthorn (a possible adaptation to attract pollinators).

Ne’er drop a clout ‘til May be out’ is often thought to mean beware of frosts until the month of May has passed. More likely it is linked to the flowering time of the hawthorn, as a country sign that the risk of frost has passed and Summer arrived. It is interesting to note how things can become lost or change over time: some speculate that this would have been more salient before the adoption of the Gregorian calendar in 1752, when May 1 was shifted a fortnight earlier. In our time, climate change may play a part: from the look of the buds on the Common in April 2020, this year May will be out several weeks earlier than ‘normal’.

Other thorns on the Common:

Midland Thorn (Crateagus laevigata) is a native, but due to its pretty pink flowers has also been bred as a garden ornamental tree. Any thorn seen on the Common with pink or red flowers is almost certainly a hybrid garden escape.  It is otherwise very similar to hawthorn, although its haws have double seeds and are a little bigger and brighter.

Purging Buckthorn (Rhamnus catharticus) has been introduced in recent hedge plantings as it is a good host plant for butterflies, especially brimstones, and other insects. Flowers, leaves and berries cluster on short stems with thorns (shaped like a buck’s antlers) whilst longer stems provide growth. The shiny black berries are poisonous to humans, having a purgative (laxative) effect in small doses.

M Hildesley; S Morgan. Images A Wilson unless stated. 20 April 2020. Updated June 2021

Holland M FLS and Giordano P; 2020; I Ate Sunshine for Breakfast; Flying Eye Books: London

Wiktionary

The Irish Times. Fairy Bush Survives Motorway Planners. Saturday 29th May 1999

Glastonbury Abbey; The Holy Thorn

https://treesforlife.org.uk/into-the-forest/trees-plants-animals/trees/hawthorn/

http://www.thegoddesstree.com/trees/Hawthorn.htm

Thorn

'Ne’er cast a clout ‘til  May be out'....We are fortunate to have two naturally occurring native species of Thorn on the Common.

 

Blackthorn in April 2020

Ne’er cast a clout ‘til  May be out. We are fortunate to have two naturally occurring native species of Thorn on the Common.

Hawthorn (Crateagus monogyna), also known as May, can reach a height of about 15m. It is the only tree specifically linked to a month of the year. Traditionally flowering around May Day, in a profusion of white, following the earlier appearance of small, maple-like leaves, it will be interesting to observe if this timing alters with environmental and climatic changes.

The leaves are deeply lobed and quite small at 4-6cm long. The bark is reddish brown and breaks into rectangular platelets, while the trunk (which may be single or multiple) often has a knotted, fissured and wizened look. Its highly dense, pale pink wood is useful for turnery (for handles, boxes, even boat parts), as well as having high fuel value for wood and charcoal.

Fruits appear in clusters of red berries (‘haws’) later in the year, remaining until Spring, unless eaten by birds. Haws can upset our own stomachs if eaten raw but when cooked – often with the vitamin C-rich rose hips – and sieved to create a jelly, they are a source of vitamins and antioxidants. Seeds have such a tough outer shell that they need to be in the ground for two winters before the tiny root (radicle) can break through and start a new plant.

Around the Common, you can find hawthorns in hedges and as individual trees. The tree in the main photo has five large trunks and with the largest having a 1.2m girth at 1.2m from the ground, is designated ‘significant’. From this we estimate its age at 160-240 years, making this magnificent tree a strong contender for one of the oldest on the Common.

Blackthorn (Prunus spinosa) or Sloe, tends to grow as more of a bush and rarely exceeds 5m in height. Left unmanaged, blackthorn spreads by suckering, creating large thickets that can be seen in at least four parts of the Common (this means that rooted whips can be sourced and transplanted very easily in winter).

Large drifts of Blackthorn’s white flowers are among the first to herald the coming of Spring and appear several weeks before Hawthorn flowers, as in the above photo, taken in March 2020. Blackthorn differs from Hawthorn in that its flowers appear long before its small, elongated, oval and toothed leaves. With sharp thorns along each twig that itself ends in a pointed thorn, blackthorn can be a vicious plant, as any gardener or woodsman caught by its thorns will confirm. The bark is dark brown, smooth and in winter the twigs look black and spiny.  The wood is tough and yellow, traditionally used for walking sticks and in Ireland, for shillelaghs.

The familiar fruits (sloes) are dark blue/black. Sloes are thought to be the crop-wild ancestors of our domesticated gages, damsons and plums.  They are extremely sour, full of tannins (another antioxidant) and used to infuse gin – wonderful for warming a cold winter work party (a much-appreciated FoBC tradition instigated by an early volunteer, Dennis Brown).

Hedging:  Both species have traditionally been used in hedging because as mentioned, they form a thorny and impenetrable barrier that is very useful for stock control (a possible an inspiration for barbed wire).  The ease of propagation and speed of growth for hedging led to the common name ‘Quickset’ and is applied to either species, but especially hawthorn.

A managed hedge will thicken when trimmed. Gaps at lower levels can be filled by hedge-laying (the craft of partially cutting and bending over the trunk, weaving it between stakes, typically of hazel – often planted along with blackthorn in a hedge.  So long as the stems have not been wholly cut through, the plant will re-shoot with new verticals, giving fresh life to the hedge as an effective barrier.

Putney Boundary: Competition between land, people and animals is not a new thing. In 1594, as the population began to recover from the effects of the Black Death, there was massive rivalry over grazing between residents of Putney and Barnes, when ‘heads were broken’ (someone was killed). This event led Queen Elizabeth I to order a boundary ditch be dug and a hedge planted to stop cattle (a term referring to any domestic animal owned as a chattel: cows, pigs and sheep) from crossing the boundary.  Is the thicket of blackthorn near the boundary today a remnant of that original hedge? I certainly like to think so!

Biodiversity: Blackthorn is the food plant for numerous moths and other invertebrates, as well as where rare brown and black hairstreak butterflies lay their eggs. We have also seen eggs of the blue-bordered carpet moth on our blackthorn, which can be confused with the eggs of the brown hairstreak. Its early flowering provides a vital nectar source for pollinators. Hawthorn hosts more than 300 insects and its profusion of berries supports many migrating as well as local birds.

Mythology and beliefs: Hawthorn are deeply rooted in our pastoral/pagan past (the term ‘pagan’, only recorded in English from around 1375, derives from Latin ‘paganus’ meaning rural or rustic and originally had no religious connotation). Hawthorn is a symbol of spring and fertility, its leaves providing the wreath or garland of the Green Man.  In one tale,  its petals formed the Milky Way.  Pre-Christian Celtic culture revered the hawthorn and in Ireland it is associated with the Faery Queen and the Little People. Traditions still hold strong today. As recently as 1999, a single hawthorn bush brought the building of a motorway to a halt in Co Clare, necessitating a deviation. In England it is more associated with love and the arrival of Summer, with special mention for the Glastonbury thorn.

Thorns also have a dark side in mythology. Blackthorn has a long association with ‘witchcraft’, purported to provide wands and staffs for witches. Trees can appear gnarled giving rise to the name ‘witches’ broom’ for gall-induced changes in growth. There is also a superstition that you must not bring hawthorn into the home, as it will bring disease because it was said to ‘smell of the Plague’. Interestingly, science has established that hawthorn blossom contains trimethylamine, a chemical which is one of the early releases when animal tissue decays – so there was good reason for the relationship, even if that is unfair on the hawthorn (a possible adaptation to attract pollinators).

Ne’er drop a clout ‘til May be out’ is often thought to mean beware of frosts until the month of May has passed. More likely it is linked to the flowering time of the hawthorn, as a country sign that the risk of frost has passed and Summer arrived. It is interesting to note how things can become lost or change over time: some speculate that this would have been more salient before the adoption of the Gregorian calendar in 1752, when May 1 was shifted a fortnight earlier. In our time, climate change may play a part: from the look of the buds on the Common in April 2020, this year May will be out several weeks earlier than ‘normal’.

Other thorns on the Common:

Midland Thorn (Crateagus laevigata) is a native, but due to its pretty pink flowers has also been bred as a garden ornamental tree. Any thorn seen on the Common with pink or red flowers is almost certainly a hybrid garden escape.  It is otherwise very similar to hawthorn, although its haws have double seeds and are a little bigger and brighter.

Purging Buckthorn (Rhamnus catharticus) has been introduced in recent hedge plantings as it is a good host plant for butterflies, especially brimstones, and other insects. Flowers, leaves and berries cluster on short stems with thorns (shaped like a buck’s antlers) whilst longer stems provide growth. The shiny black berries are poisonous to humans, having a purgative (laxative) effect in small doses.

M Hildesley; S Morgan. Images A Wilson unless stated. 20 April 2020. Updated June 2021

Holland M FLS and Giordano P; 2020; I Ate Sunshine for Breakfast; Flying Eye Books: London

Wiktionary

The Irish Times. Fairy Bush Survives Motorway Planners. Saturday 29th May 1999

Glastonbury Abbey; The Holy Thorn

https://treesforlife.org.uk/into-the-forest/trees-plants-animals/trees/hawthorn/

http://www.thegoddesstree.com/trees/Hawthorn.htm

Related links

Winter Wassail

‘Common’ Trees

Woodland Management