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Celtic Tree Calendar · Month 9 of 13

Hazel, the month of the letter Coll

Hazel is the ninth of Graves' tree months, 5 August to 1 September, led by the Ogham letter Coll, C. Its Old Irish name coll genuinely means hazel, its kenning is fairest of trees, and the hazel belongs to two medieval Irish stories of the salmon of knowledge.

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The Ogham letter Coll drawn upright on a stemline, four strokes to the left of the stemline, read from the bottom up; beside it the words Coll, the Hazel month, letter C, and the dates 5 August to 1 September. Coll The Hazel month · letter C 5 Aug to 1 Sep Old Irish coll Name means hazel Read from the bottom up
Coll, the letter C, as it is cut on the stones: four strokes to the left of the stemline, read upwards. Drawn by us from its Unicode code point, not from a font.

Facts

Tree month
5 August to 1 September (Graves, 1948)
Days
28
Ogham letter
Coll, the letter C (U+1689, OGHAM LETTER COLL)
Old Irish name
coll
The name means
hazel
Letter and tree
The name means the tree
Kenning (Morann)
caíniu fedaib, "fairest of trees" (tr. Calder 1917, p. 279)
Medieval tree gloss
hazel (Auraicept, Calder 1917, p. 93)
The tree in Modern Irish
coll

Meaning

Hazel is a many-stemmed tree of woods and hedges whose nuts were an important food. The kenning of its letter is "fairest of trees", in Calder's translation, and the Auraicept gives the reason: "Fair wood, that is, hazel, i.e., every one is eating of its nuts".

Our reading takes patiently gathered wisdom from the tree and its stories: people born in this month are read as curious and clear-minded, at their best when they share what they learn. The reading is ours.

The letter

Coll is the fourth letter of the second group: four strokes to the left of the stemline. Its Old Irish name coll genuinely means hazel, one of the few letter names that is a tree, and both medieval tracts and O'Flaherty gloss it so.

The salmon of knowledge

Two medieval Irish stories meet here, and popular retellings join them. In the tale of Finn's boyhood, a poet watches the salmon of Féc's pool on the Boyne for seven years; the boy Finn, cooking it, burns his thumb on the skin and gains its knowledge. That tale, in Kuno Meyer's translation of 1904, has no hazelnuts in it. The hazelnuts are in another text, the verse place-lore of the river Shannon, where nine hazels drop their nuts into Connla's well and the salmon eat them. Both are medieval stories, told here as stories.

In Graves' year

Hazel runs from 5 August to 1 September, the same in every list. Graves pairs the hazel with Mercury among his trees of the week. The gemstones of tree-sign websites are modern, and our own old table even gave Hazel the hawthorn's stone by a copy slip; none is 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
"Fair wood, that is, hazel, i.e., every one is eating of its nuts" (Calder 1917, p. 93) sourced
The Ogam Tract's gloss
the same tree (Calder 1917, p. 277) sourced
O'Flaherty's gloss (1685)
Coll, the hazel sourced
How the letter is tied to the tree
The name means the tree sourced
Colour and bird words for the letter (a medieval curiosity)
Colour: cron, "brown"; no bird word for C in the Book of Ballymote. Words that begin with the letter, like the tract's lists of churches; not the tree's colour or animal sourced
Our reading
A tree whose nuts fed people: curious and clear-minded, at its best when it shares what it learns. our construction

How the schools read it

The medieval tracts
The kenning "fairest of trees"; the Auraicept glosses the letter hazel.
O'Flaherty, 1685
Coll, the hazel.
Graves, 1948
The ninth month, 5 August to 1 September.
Ogham scholarship
coll is one of the few letter names that genuinely names a tree.
Tree-sign websites
The same dates; a planet, gemstone, animal and personality title, all modern. Not used here.
EsoTerrier
A tree whose nuts fed people: curious and clear-minded, at its best when it shares what it learns.

Claims about it

  • The Hazel 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 hazel's gemstone is topaz.

    false

    What the record shows: A copy slip in our own engine before October 2026, taken from the hawthorn's row. All gemstones were dropped.

  • The Hazel 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.

  • The Hazel month has a traditional planet, element, gemstone and animal.

    false

    What the record shows: Modern additions: the planets are Helena Paterson's (1992), the rest come from later web lists that disagree with one another. None is medieval or in Graves as a set.

Elsewhere on EsoTerrier

Sources

Primary texts (6)
  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
  5. Kuno Meyer (tr.), "The Boyish Exploits of Finn", Ériu 1 (1904), pp. 180 to 190. archive.org/details/eriu_1904_1
  6. Edward Gwynn (ed. and tr.), The Metrical Dindshenchas, part III, "Sinann II". Dublin, 1913. celt.ucc.ie/published/T106500C
Studies and other sources (8)
  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. Helena Paterson, The Celtic Lunar Zodiac. London: Rider, 1992 (known from catalogue records and Penczak). search.worldcat.org/oclc/31606966
  6. 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
  7. Icy Sedgwick, "Celtic Tree Astrology" (2018), a composite gemstone and animal list (cited only as the source of the claim).
  8. Foras na Gaeilge, focloir.ie and teanglann.ie (Modern Irish forms). focloir.ie
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.