What it means
Hazel is the tree of wisdom in Irish lore, and Hazel people are said to collect knowledge the way squirrels collect nuts. They like to understand how things work, they catch details others skim, and they are happiest when they can bring order to a mess. Many are strong students, good teachers and quietly funny. The tradition also warns that knowing a lot can tip into needing to be right.
Strengths
Sharp intelligence, a good memory, organization, attention to detail, and the ability to explain things clearly.
Challenges
Perfectionism, a know-it-all edge, anxiety when things fall out of order, and overthinking simple choices.
Hazel dates and Ogham letter
Hazel runs from August 5 to September 1 (28 days). Its Ogham letter is Coll, the letter for the sound C. The dates come from the tree calendar Robert Graves set out in The White Goddess (1948): thirteen 28-day months named after Ogham letters in his Beth-Luis-Nion order, plus one spare day, December 23. It is a modern system inspired by the Ogham, not a calendar recorded from the ancient Druids, and scholars think only some of the Ogham letter names first meant trees. On the Western calendar, Hazel starts in Leo and the Sun moves into Virgo around August 23, so roughly the first 18 days are Leo Suns and the last 10 are Virgo.
The hazel in folklore
In Irish myth, hazel trees grew around a sacred well and dropped their nuts into the water, where the Salmon of Knowledge ate them. The young Fionn mac Cumhaill burned his thumb while cooking the salmon, sucked it, and took in all the fish's wisdom. Forked hazel rods are still the classic choice for water divining.
How Cosmic Array reads it
Your tree depends only on the day and month you were born, so the year and birth time don't change it. The Architect blueprint shows your Celtic tree next to your Chinese animal, Mayan sign and Egyptian deity, and its written synthesis can set the tree against your Western Sun, Moon and Rising.