We recommend that you fertilize your Spicebush twice during each growing season. The best times to do this are in early spring before their growing season begins and then again in midsummer as a pick-me-up dose. When choosing a fertilizer for your Spicebush, use a fertilizer that is specifically formulated for deciduous shrubs. Doing so will ensure your shrubs thrive and grow to their fullest potential that growing season. Be sure to stop fertilizing during their growth dormancy seasons of fall and winter. Fertilizing during this time of year could do more harm than good to your plants and negatively impact their next growing season.