Alt Arbor Day

[catocom]

Save yourself, and trees, a lot of headache and prune plants during winter months

Although National Arbor Day isn't until April, some states choose to mark the day during a time period that is better suited for tree planting, say officials with the Arbor Day Foundation.

http://www.gainesvilletimes.com/section/199/article/46081/

I guess this might fall under the science category.