11. Sometimes bacterial preparations may be used to control insect infestation on cycads . 12. Cycads are primitive plants that have existed for nearly 200 million years.13. These exist in a symbiotic relationship with the cycad by nitrogen fixation. 14. Many populations now exist in suburban areas with ornamental cycads . 15. Initial laboratory results found low levels of free BMAA in cycad flour. 16. This cycad has a cylindrical trunk about 20 to 30 centimeters long. 17. Cycads formed the second largest group until about 120 Ma.18. It is considered to be one of the most popular cultivated cycads . 19. On land, the local flora included conifers and cycads . 20. The Conservatory is home to many exotics including ferns, cycads and orchids.
