It looks like the soil still are moist from your last watering... I cant give u any advice in when and how, i am just on my second grow. Still a noob. But touch the soil with your fingers. Feel how heavy the pot is. How does the soil look like, that is how i do... What strain is it? If u gonna grow out door i think its better to have more then just a few... Maybe some get eaten, die or something but then u still got some extras.