How to Fertilize Ailanthus?
For optimal growth, ailanthus benefits from a balanced, slow-release fertilizer with equal parts nitrogen (N), phosphorus (P), and potassium (K), like a 10-10-10 NPK formula. Nitrogen supports leaf development, but excessive nitrogen should be avoided to prevent lush foliage at the expense of blooms. In the growing season, apply fertilizer every 4-6 weeks. As ailanthus enters dormancy, reduce fertilization to encourage natural seasonal rest. In spring, resume fertilization to support new growth. Note that ailanthus is sensitive to over-fertilization, so moderation is key.