This is the longest day of the year. It is a celebration of passion and success.
Originaly it was not part of the Celtic year. It was brought in by the Norse and the Saxons, just as they did with Yule.

The colour to represent MidSummer is Green. Some of the "symbols" used at this time are Fire, Mistletoe, SolarDisk, Feathers and Blades. Deities: Gods at their peak of power and the Pregnant Goddess.

Good flowers to use on your altar would be red roses and sunflowers.