Rose of Sharon (Hibiscus syriacus) trees thrive in well-drained soil with good fertility. Here's a breakdown of the best fertilizer types and a simple feeding schedule:
Best Fertilizer Types:
* Balanced Fertilizer: A balanced fertilizer with an NPK ratio of 10-10-10 or 12-12-12 is a great starting point. This provides the essential nutrients of nitrogen (N), phosphorus (P), and potassium (K) in equal amounts.
* Acid-Loving Plant Fertilizer: Since Rose of Sharon prefers slightly acidic soil (pH 6.0-6.5), you can use a fertilizer specifically formulated for acid-loving plants. These often have a higher phosphorus content to promote blooming.
* Organic Fertilizer: Consider using organic options like compost, manure, or fish emulsion. These release nutrients slowly and improve soil structure over time.
Feeding Schedule:
* Early Spring: Apply fertilizer once in early spring, just before new growth emerges.
* Mid-Summer: Apply another dose in mid-summer to support blooming.
* Late Summer: You may apply a light feeding in late summer if needed, but avoid fertilizing too close to autumn.
Important Tips:
* Soil Test: Before applying fertilizer, consider getting a soil test. This will help determine the specific nutrient needs of your soil and avoid over-fertilizing.
* Water Well: Always water your Rose of Sharon deeply after fertilizing to help the nutrients reach the roots.
* Avoid Over-Fertilizing: Too much fertilizer can lead to excessive foliage growth at the expense of flowers and even damage the roots.
* Mulch: Apply a layer of organic mulch around the base of the tree to help retain moisture, regulate temperature, and suppress weeds.
Remember: Rose of Sharon is a relatively low-maintenance tree. If your soil is already fertile and well-drained, you may not need to fertilize at all.