Ten Ways to Celebrate Mabon
Mabon is the time of the autumn equinox, and the harvest is winding down. The fields are nearly bare, because the crops have been stored for the coming winter. Mabon is a time when we take a few moments to honor the changing seasons, and celebrate the second harvest. On or around September 21, for many Pagan and Wiccan traditions it is a time of giving thanks for the things we have, whether it is abundant crops or other blessings. It is also a time of balance and reflection, following the theme of equal hours light and dark. Here are some ways you and your family can celebrate this day of bounty and abundance.
http://paganwiccan.about.com/od/mabontheautumnequinox/tp/TenMabonIdeas.htm
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It would not make sense to celebrate Harvest at Spring planting time. 
A couple of good books to check out: Witchcraft, Theory and Practice
When I See The Wild God
Both are written by Ly de Angeles, who is a witch living in Australia. Ly also has a Facebook page. She has also reissued one of her older books: Genesis. (I think the rest of the title is A Legend of Future Past).
Ly also has written some excellent fiction books: The Quickening (recently revised and re-issued), and The Shining Ones. I can highly recommend all of her books!
Even though it is Fall in my part of the world, I wish you happy planting if it is Spring where you live.
