I have a 2 year old lavender plant growing in a 5 gallon wicking bucket. I have been watering it through a one inch pvc reservoir pipe. I put a TBS of a water soluble fertilizer in the reservoir pipe once a month. It is made for vegetative growth, It has a high nitrogen ratio. I will switch to Bloom in the spring.I've never tried to put it in a planter. I've only ever sowed or direct planted it in the ground.