Companion planting is defined as a method of closely planting two different plants to enhance each other’s growth or protection from pests.

0:33 When should you think about companion planting?
0:38 Does Companion Planting Work to Deter Pests?
1:39 Will companion planting improve the flavor of food grown next to each other?
3:38 Does companion planting attack beneficial insects such as pollinators?
4:22 Polyculture as a method of companion planting to increase harvests

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[1] Nematode impacts
http://www.ctahr.hawaii.edu/oc/freepubs/pdf/PD-35.pdf

[2] Floral scent emission and pollinator attraction in two species of Gymnadenia(Orchidaceae)
http://link.springer.com/article/10.1007/s00442-004-1750-9#/page-1

[3] Effect of intercropping white cabbage with French Marigold (Tagetes patula nana L.) and Pot Marigold (Calendula officinalis L.) on the colonization of plants by pest insects
http://www.degruyter.com/view/j/fhort.2009.21.issue-1/fhort-2013-0129/fhort-2013-0129.xml

[4] Nematodes
http://msue.anr.msu.edu/news/a_quick_look_at_plant_disease_caused_by_nematodes

[5] Polyculture
https://puyallup.wsu.edu/wp-content/uploads/sites/403/2015/03/companion-plantings.pdf
[6] Companion planting – do aromatic plants disrupt host-plant finding by the cabbage root fly and the onion fly more effectively than non-aromatic plants?
http://onlinelibrary.wiley.com/doi/10.1046/j.0013-8703.2003.00102.x/abstract;jsessionid=7C435781AB8CA302E5C7D628830DD1D0.f02t03?userIsAuthenticated=false&deniedAccessCustomisedMessage=
[7] Secondary plants used in biological control: A review
http://www.tandfonline.com/doi/abs/10.1080/09670874.2012.659229
[8] Changes in USDA Food Composition Data for 43 Garden Crops, 1950 to 1999:
http://www.semencespaysannes.org/bdf/docs/fruit_content.pdf
[9] University of California Davis paper:
http://ucce.ucdavis.edu/files/datastore/234-526.pdf