chemical to increase flowering, fruit set, and root growth?

General Discussion
1

High GA3 concentration is known to inhibit flowering of roses, see for example:

http://www.springerlink.com/content/r452n23m14v88567/

There is a chemical that is a known gibberellic acid biosynthesis inhibitor. It is prohexadione-calcium (ProCa). A 2005 Ph.D. thesis that investigated this compound is available for free download at: Http://library.wur.nl/wda/dissertations/dis3808.pdf

The author studied strawberries but the thesis may give some information at least worth trying on roses. I particularlly recommend reading the 2 chapters starting on page 81 and on page 89.

The following link gives the available commercial products:

Link: library.wur.nl/wda/dissertations/dis3808.pdf

2

See:

http://scholar.google.com/scholar?q=Takami%2C+T.%2C+Hisamatsu%2C+T.%2C+Koshioka%2C+M.&hl=en&lr=&btnG=Search

Link: scholar.google.com/scholar?q=Takami%2C+T.%2C+Hisamatsu%2C+T.%2C+Koshioka%2C+M.&hl=en&lr=&btnG=Search