Tu Bishvat (Holiday of Trees)
Do not destroy (Deut 20:19-20)

wikipedia Tu Bishvat... Holiday of Trees
wikipedia Tu Bishvat Seder... (Kabbalistic tradition)
youtube Tu Bishvat Global Seder 2007 Promo... (Kabbalistic tradition)
wikipedia Sephirot... (the Kabbalistic map of the tree of life)

01-29-10 ynetnews.com Over 500,000 participated in Tu B'Shvat tree plantings