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Celtic Tree Calendar · Month 3 of 13

Ash, the month of the letter Nion

Ash is the third of Graves' tree months, 18 February to 17 March, and the one that holds 29 February. It is led by the Ogham letter Nion, N, whose name means a fork or a loft; the medieval tracts gloss it as ash, the wood of spear shafts.

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The Ogham letter Nion drawn upright on a stemline, five strokes to the right of the stemline, read from the bottom up; beside it the words Nion, the Ash month, letter N, and the dates 18 February to 17 March. Nion The Ash month · letter N 18 Feb to 17 Mar Old Irish nin A medieval gloss Read from the bottom up
Nion, the letter N, as it is cut on the stones: five strokes to the right of the stemline, read upwards. Drawn by us from its Unicode code point, not from a font.

Facts

Tree month
18 February to 17 March (Graves, 1948)
Days
28; 29 in a leap year, with 29 February
Ogham letter
Nion, the letter N (U+1685, OGHAM LETTER NION)
Old Irish name
nin
The name means
fork or loft, part of a weaver's beam in the glosses
Letter and tree
A medieval gloss: the name means something else
Kenning (Morann)
cosdad síde, "checking of peace" (tr. Calder 1917, p. 279)
Medieval tree gloss
ash (uinnius) (Auraicept, Calder 1917, p. 91)
The tree in Modern Irish
fuinseog

Meaning

Ash is a tall, open tree with strong, springy wood, long used for tool handles and spear shafts. The kenning of its letter is "checking of peace", in Calder's translation, and the Auraicept explains it by those shafts: "A check on peace is nin, viz., ash, for of it are made the spear-shafts by which the peace is broken".

Our reading takes reach and resilience from the tree: people born in this month are read as taking a wide view and bending without breaking, with a strength that is best used with care for what it might disturb. The reading is ours.

The letter

Nion is the fifth letter of the stones, with five strokes to the right of the stemline, and the third of Graves' calendar. The reason is Roderick O'Flaherty: in 1685 he argued that since the alphabet was called Beth-luis-nion, N must once have stood third, and Graves built his order on that guess. Unicode, like the stones, keeps it fifth. Its Old Irish name nin means a fork or a loft, part of a weaver's beam in the glosses; it is not a tree name. The Auraicept glosses it as ash; the Ogam Tract offers "maw of spear, or nettles". Graves and the websites often spell it Nuin.

Ash in Irish lore

Irish tradition knew sacred trees, and medieval lore names five great trees of Ireland, three of them ashes. The cosmic world ash belongs to Norse sources, not to Irish ones, and is not part of this month.

In Graves' year

Ash runs from 18 February to 17 March. No source says where 29 February belongs; by our own convention it falls here, so in a leap year this month has 29 days. Planets, gemstones, animals and personality titles given to the Ash month on tree-sign websites are modern, after Paterson (1992) and later lists, 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 check on peace is nin, viz., ash, for of it are made the spear-shafts by which the peace is broken" (Calder 1917, p. 91) sourced
The Ogam Tract's gloss
"maw of spear, or nettles" (Calder 1917, p. 277) sourced
O'Flaherty's gloss (1685)
Nion, commonly Uinsionn, the ash tree of which spears are made 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: necht, "clear"; bird: naescu, "snipe". Words that begin with the letter, like the tract's lists of churches; not the tree's colour or animal sourced
Our reading
A tall, springy tree: taking a wide view and bending without breaking, with strength used carefully. our construction

How the schools read it

The medieval tracts
The kenning "checking of peace"; the Auraicept glosses the letter ash (uinnius).
O'Flaherty, 1685
Nion, commonly Uinsionn, the ash tree of which spears are made.
Graves, 1948
The third month, 18 February to 17 March.
Ogham scholarship
nin means fork or loft, part of a weaver's beam in the glosses; 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
A tall, springy tree: taking a wide view and bending without breaking, with strength used carefully.

Claims about it

  • The letter name Nion means ash.

    false

    What the record shows: Nin means a fork or a loft, part of a weaver's beam in the glosses. The ash is a medieval gloss; the Ogam Tract offers a spear or nettles instead.

  • The ash is the world tree of Celtic lore.

    disputed

    What the record shows: The cosmic ash belongs to Old Norse sources, not Irish ones. Irish tradition knows sacred trees and the five great trees of Ireland, three of them ashes, but no world tree.

  • The Ash 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 Ash 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 (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 (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. Peter Berresford Ellis, "The Fabrication of 'Celtic' Astrology", The Astrological Journal 39 (1997). cura.free.fr/xv/13ellis2.html
  4. "Ogham", Wikipedia (orientation only). en.wikipedia.org/wiki/Ogham
  5. Mary Jones, "Celtic Tree Calendar", Jones's Celtic Encyclopedia (2004). maryjones.us/jce/celtictreecalendar.html
  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
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.

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