These crops are frequently grown in tropical climates. With minimal upfront costs, they can be reproduced for consumption and sale. These links provide information on the various crops.
http://www.findarticles.com/p/articles/mi_m1082/is_n4_v41/ai_19660633
http://www.theworldwidegourmet.com/fruits/banana/culture.htm
http://www.oxfam.org.uk/coolplanet/kidsweb/banana/banana.htm
http://bsi.org/brom_info/growing/pineapple.html
This web site provides 2 recipes for preparing chaya, also known as tree spinach.
http://www.bellaonline.com/articles/art46435.asp
This downloadable PDF document details the tree spinach plant, with extensive references. Dr. Martin Price, co-founder of ECHO and head of ECHO’s Agricultural Resources Department, has said, “I would consider chaya to be one of the five most important underutilized food plants ECHO distributes.”
http://www.echotech.org/mambo/images/DocMan/Chaya07.pdf
This article, entitled Potential Nutritional and Health Benefits of Tree Spinach [Chaya], is from the horticulture department of Purdue University.
http://www.hort.purdue.edu/newcrop/proceedings1996/V3-516.html
A brief article on tree spinach, including how to grow and prepare it. It also includes 2 recipes.
http://www.urbanharvest.org/advice/vegetables/chaya.html
http://bsi.org/brom_info/growing/pineapple.html
http://aggie-horticulture.tamu.edu/citrus/pineapple.htm
http://www.ipm.iastate.edu/ipm/hortnews/2003/12-5-2003/pineapple.html
http://www.selah.k12.wa.us/soar/sciproj2000/maral.html
http://plantanswers.tamu.edu/recipes/sweetpotatoes.html
http://plantanswers.tamu.edu/vegetables/sweet.html
http://www.gardenersnet.com/vegetable/yams.htm
http://www.farmradio.org/english/radio-scripts/32-1script_en.asp

