tripple berry but no thc

so i have a tripple berry thats about 12 feet tall outdoors and its prob in week 4 or so of flowering and there is hardly any thc on the flowers. so my question is what can i do to help this plant out or is it the genetics (im sure i spelled that wrong) just shit? it was a hand me down so im not sure if its just a bad clone. but i have been doin what i did to my other strains and they were way ahead of this one at the same stage.

most strains start trichome production on about 4th week , but no trichs doesnt mean no thc tho , w8 another week and then u ll see where it is going to

ok. it has been rainning the last few days so im trying to be carefull on feeding them but its goin to be sunny for the next week so ill start giving them some more food