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Celtic Tree Calendar · Month 6 of 13

Hawthorn, the month of the letter Uath

Hawthorn is the sixth of Graves' tree months, 13 May to 9 June, led by the Ogham letter Uath, H. The medieval tracts gloss the letter as whitethorn, though the name úath means fear or horror, and the lone hawthorn as a fairy tree is living Irish folklore.

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The Ogham letter Uath drawn upright on a stemline, one stroke to the left of the stemline, read from the bottom up; beside it the words Uath, the Hawthorn month, letter H, and the dates 13 May to 9 June. Uath The Hawthorn month · letter H 13 May to 9 Jun Old Irish úath A medieval gloss Read from the bottom up
Uath, the letter H, as it is cut on the stones: one stroke to the left of the stemline, read upwards. Drawn by us from its Unicode code point, not from a font.

Facts

Tree month
13 May to 9 June (Graves, 1948)
Days
28
Ogham letter
Uath, the letter H (U+1686, OGHAM LETTER UATH)
Old Irish name
úath
The name means
fear or horror
Letter and tree
A medieval gloss: the name means something else
Kenning (Morann)
condál cúan, "pack of wolves" (tr. Calder 1917, p. 279)
Medieval tree gloss
whitethorn, hawthorn (sce) (Auraicept, Calder 1917, p. 91)
The tree in Modern Irish
sceach gheal

Meaning

Hawthorn is a dense, thorny tree of hedges and field edges, white with blossom in May. The kenning of its letter is "pack of wolves", in Calder's translation, and the Auraicept gives two explanations: "A meet of hounds is huath, viz. white-thorn; or because it is formidable owing to its thorns".

Our reading holds the contrast together: people born in this month are read as guarded on the outside and gentle within, keeping their boundaries with care. The reading is ours.

The letter

Uath is the first letter of the second group: one stroke to the left of the stemline. Its Old Irish name úath means fear or horror; it is not a tree name. The Auraicept glosses it as whitethorn, and the Ogam Tract as "test-tree or whitethorn"; O'Flaherty in 1685 has whitethorn or thorny bushes. The manuscripts spell it huath; the Modern Irish name is Uath.

The fairy thorn

A lone hawthorn standing in a field is, in Irish folklore, a fairy tree that people will not cut. The custom is alive: in 1999 the new road near Latoon, County Clare, was built around a fairy thorn rather than through it. It is told here as custom.

In Graves' year

Hawthorn runs from 13 May to 9 June in every list of the tree months, apart from one summary that gives 15 May, most likely a slip. Paterson gave the Hawthorn month the planet Vulcan, which does not exist; that and the gemstones, animals and personality titles of tree-sign websites are modern, and are not used here.

Correspondences

Each item with how it stands: “sourced” is in the work cited, “our construction” is EsoTerrier’s own, and “disputed” means the sources disagree.

The Auraicept's explanation
"A meet of hounds is huath, viz. white-thorn; or because it is formidable owing to its thorns" (Calder 1917, p. 91) sourced
The Ogam Tract's gloss
test-tree or whitethorn (Calder 1917, p. 277) sourced
O'Flaherty's gloss (1685)
Uath, white-thorn or thorny bushes sourced
How the letter is tied to the tree
A medieval gloss: the name means something else sourced
Colour and bird words for the letter (a medieval curiosity)
Colour: húath, "terrible"; bird: hadaig, "night raven (?)". Words that begin with the letter, like the tract's lists of churches; not the tree's colour or animal sourced
Our reading
Thorny outside and white with blossom in May: guarded on the outside and gentle within, keeping boundaries with care. our construction

How the schools read it

The medieval tracts
The kenning "pack of wolves"; the Auraicept glosses the letter whitethorn.
O'Flaherty, 1685
Uath, white-thorn or thorny bushes.
Graves, 1948
The sixth month, 13 May to 9 June.
Ogham scholarship
úath means fear or horror; the tree is a learned gloss.
Tree-sign websites
The same dates; a planet, gemstone, animal and personality title, all modern. Not used here.
EsoTerrier
Thorny outside and white with blossom in May: guarded on the outside and gentle within, keeping boundaries with care.

Claims about it

  • The letter name Uath means hawthorn.

    false

    What the record shows: Úath means fear or horror. The whitethorn is the medieval scholars' gloss, which the tract explains by the tree being formidable for its thorns.

  • The hawthorn is ruled by the planet Vulcan.

    disputed

    What the record shows: Paterson's attribution of 1992. Vulcan is a hypothetical planet inside Mercury's orbit that does not exist. We give no planets.

  • The Hawthorn month belongs to an old Celtic calendar that the Druids kept.

    false

    What the record shows: No ancient or medieval source has a tree calendar or a tree for each birthday. The thirteen months are Robert Graves', set out in 1948.

  • The Hawthorn month has a traditional personality title.

    false

    What the record shows: The thirteen titles come from one website of the 2000s and were copied widely; nothing in Graves, Paterson or the medieval tracts supports them. We never use them.

Elsewhere on EsoTerrier

Sources

Primary texts (4)
  1. George Calder (ed. and tr.), Auraicept na n-Éces: The Scholars' Primer, with In Lebor Ogaim (the Ogam Tract). Edinburgh: John Grant, 1917. Quoted with page. archive.org/details/auraicept00calduoft
  2. Roderick O'Flaherty, Ogygia. London, 1685; English by James Hely, Dublin, 1793. archive.org/details/ogygiaorachrono00helygoog
  3. Robert Graves, The White Goddess. London: Faber and Faber, 1948 (revised 1952 and 1961). Facts only; not quoted.
  4. The Unicode Standard, Ogham block U+1680 to U+169F (encoded in Unicode 3.0, 1999). unicode.org/charts/PDF/U1680.pdf
Studies and other sources (9)
  1. Damian McManus, "Irish letter-names and their kennings", Ériu 39 (1988), pp. 127 to 168. jstor.org/stable/30024135
  2. Deborah Hayden and David Stifter, "Ogam and Trees", OG(H)AM project, 20 December 2022. ogham.glasgow.ac.uk/index.php/2022/12/20/ogam-and-trees
  3. "Ogham", Wikipedia (orientation only). en.wikipedia.org/wiki/Ogham
  4. Mary Jones, "Celtic Tree Calendar", Jones's Celtic Encyclopedia (2004). maryjones.us/jce/celtictreecalendar.html
  5. Christopher Penczak, "Celtic Astrology Tree Signs" (2013), crediting Paterson. christopherpenczak.com/celtic-astrology-tree-signs
  6. Helena Paterson, The Celtic Lunar Zodiac. London: Rider, 1992 (known from catalogue records and Penczak). search.worldcat.org/oclc/31606966
  7. whats-your-sign.com, "Celtic Tree Astrology", Wayback Machine capture of 28 February 2008 (cited only as the source of the claim). web.archive.org/web/20080228140902/http://www.whats-your-sign.com/celtic-tree-astrology.html
  8. Foras na Gaeilge, focloir.ie and teanglann.ie (Modern Irish forms). focloir.ie
  9. Tourism Ireland, "Five road trips with a twist" (2022), on the fairy thorn at Latoon. ireland.com/en-gb/magazine/touring-holidays/five-road-trips-with-a-twist
Our own research (2)
  1. EsoTerrier, Celtic Tree research and validation, 11 to 13 October 2026.
  2. EsoTerrier calculation engine, the Celtic Tree Calendar service, its texts and its documentation.

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By EsoTerrier. Written with AI assistance from our research and checked against its sources; last revised 19 October 2026. How we write these pages.

First published ; last revised . Corrections: support@esoterrier.com.