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Why narrow leaves? Usually shorter flowering strains are also going to be more broad leaf but there will of course be exceptions. I've heard herijuana has a short flowering time and has narrow leaf phenos from the Kentucky side of things
wonder if C99 doesnt trigger fast/easy?. as would think it would be a good outdoor var esp for the north. I have heard guys doing herijuana outdoor in canada as does finish fast. may have problems with mold depending were ur at but heri c99 cross might be cool. prob select a nice fast cut. get more flavor for the heri and less mold issues.
I don't quite understand why you want narrow leaves... do you want a cultivar with a sativa effect and a short flowering period?
Otherwise...
Critical mass has a very narrow leaf phenotype. An "indica" over a "sativa" structure.