We have rented a house in southeast Melbourne that has a nice paved courtyard in which has a beautiful lemon tree. When we came, the tree was 25-30 feet tall and had hundreds of lemons on it. I have since cut it back to around 10 feet. My dilemma is the tree has been planted and then the ground has been paved, leaving a 1 m. square hole for the tree. I cannot fertilize the drip line. Is it possible to still possible to fertilize my lemon tree correctly?