nop ..
in general you don't need to correct PH in soil ...
PH down/up is for the hydro guys .. soil hold more then 40,000 DIFFERENT bacterias per gram of soil .. it will take care of it ..
with that said .. make sure the soil you grow in have a nice PH between 6 and 7 (not the cheap soil mix from the supermarket that contains 80% peetmoss and have a PH on 5-6 that is not for weed plants (diffrent plants need diffrent grow medium/PH .. weed like it between 6 and 7 in order to take up all the nutrients it needs)
and may I suggest you plant it in the ground if possible ?
pots are for indoor growing or for Ppl. that have to move em inside at night for security (bad wether/thieves/police)
if you decide to grow em in the ground (and even if you don't)
I would advice you to start em inside a few week before you plan to plant em out .. to give em a good head start .. so you have nice small strong seedlings when your wether allow you to plant em outdoors ..