As I already wrote in one of my previous blogs, another name for the Ogham alphabet is the Celtic tree alphabet. The reason for this is because each Ogham letter is associated with a tree or plant.
Although the Ogham alphabet relates to the AD, it is known that the Druids began to use a system in the form of a calendar that was based on the movements (circles) of the moon at the end of BC.
That system was The Ogham calendar. Each tree in the calendar has its own moon cycle span of 28 days and an Ogham letter symbol.
Ivy (assigned with Gort – letter G ) is the 11th Moon of the Celtic Year – It starts on Sept 30 and ends on Oct 27.
Ivy is often associated with prosperity and growth, and it is believed to be a bringer of good fortune, particularly to women.

The Ogham Calendar
Birch (letter B) Dec 24 – Jan 20
Rowan (letter L) Jan 21 – Feb 17
Ash (letter N) Feb 18 – Mar 17
Alder (letter F) Mar 18 – Apr 14
Willow (letter S) Apr 15 – May 12
Hawthorn (letter H) May 13 – Jun 9
Oak (letter D) June 10 – July 7
Holly (letter T) July 8 – Aug 4
Hazel (letter C) Aug 5 – Sept 1
Vine (letter M) Sept 2 – Sept 29
Ivy (letter G) Sept 30 – Oct 27
Reed (Letter NG) Oct 28 – Nov 24
Elder (letter R) Nov 25 – Dec 23