This document lists 9 URLs providing information about plant and tree health, disease treatment, root systems, and community farms. The URLs cover topics like identifying and curing sick plants, identifying issues with zucchini and fig trees, assessing root health in red oak trees, learning about plant root systems, and a story about community farms in South Africa.

1. Lesson 18

10. • http://www.growsonyou.com/question/show/10084-how-to-cure-this-sick-plant
• http://kimsfirstveggiegarden.wordpress.com/2012/07/17/week-17-sick-zucchini/
• http://www.dirtdoctor.com/newforum/root/red-oak-roots-eaten-away-worth-saving-
t6668.html
• http://savingourtrees.wordpress.com/2012/10/05/something-is-wrong-with-the-fig-
trees/
• http://www.yourleaf.org/blog/erin-silverstein/2011-11-21/healthy-roots-mean-healthy-
trees
• http://npic.orst.edu/envir/plants.html
• http://en.wikipedia.org/wiki/Root
• http://russellaaron.wordpress.com/2013/01/07/post-185-or-how-im-getting-back-to-
my-roots/
• http://www.aromahead.com/blog/2011/02/28/community-farms-in-south-africa-a-
small-miracle/young-plant-growing-in-sunshine/