These questions have been addressed below:
Do I make a stock solution and store it?
This product is tested for solubility in Chloroform at 50 mg/mL. Other publications suggest that this compound is also soluble in methanol at 10 mg/mL. In general, biochemical will remain in solution when diluted out in aqueous solutions or media.
No solution stability information is available. Note that the link below indicates the compound maintains activity over a 14 – 21 day incubation period in Arabidopsis seed cultures.
How do I mix this drug to my selection plates? And add this drug once my media is autoclaved?
This product is not tested for use in resistance or selection.
See the link below to review a publication that may be helpful. This article suggests that this compound was added to poured plates after autoclaving:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1206557/pdf/ge1401303.pdf