How to Fertilize a NorfolkIslandPine Tree. Norfolkpine trees don’t require a lot of fertilization. If you are lucky enough to be able to grow these trees outdoors, they should be able to take care of themselves, especially once they have become established. Fertilize during growing phases. In the spring, summer, and early fall, feed the NorfolkIslandpine with a balanced fertilizer every two weeks. When the plant needs to be watered, add some liquid fertilizer to the water and feed the tree. Watering and Fertilizing. Water your NorfolkIslandPine thoroughly when the upper third of the soil dries out.Do not allow the plant to sit in water. Your NorfolkIslandPine should be fertilized every 3 to 4 weeks from spring through fall. Do not fertilize during dormant periods. NorfolkIslandPines aren't too picky fertilizer-wise, and many people use 10-10-10 with okay results. Grow NorfolkIslandpine in a medium to bright spot in your home. The less light it gets, the slower it will grow. But avoid very low-light situations. If it doesn't get enough light (natural or artificial), your NorfolkIslandpine will be weak, spindly, and unattractive. Fertilizing your NorfolkIslandPine is a bit like feeding a pet - you need to know what to give, how much, and when. Let's break it down.When it comes to blooming, timing is everything. Fertilize your NorfolkIslandPine during its growing season, but ease off during low-light periods. FertilizeNorfolkIslandPines with a mild balanced fertilizer in spring and summer, but stop fertilizing in the fall and winter. When NorfolkIslandpines appear in holiday stores, they're in the resting period of their annual growing cycle. They get the most attention, but need the least amount of water and fertilizer during this time between fall and spring. NorfolkIslandpines love high humidity and bright light. These remarkable, adaptive plants can be kept as indoor trees well beyond the holidays, but they’re more than comfortable reaching greater heights outdoors. Water your NorfolkPine at least every two weeks indoors. Test your tree's soil pH and amend for acidic soil. NorfolkIslandpines are capable of growing both indoors and outdoors. While they have preferred growing conditions, they are quite forgiving and can thrive in various settings.