Please Explain the Protocol for Using Horse Manure on Roses
There are numerous horse properties not too far from where I live. I have contemplated acquiring horse manure from their stables to use on my roses next year. My questions are:
1. I have always heard it needs to be well rotted or aged prior to use on roses? What is the best method of storage and the optimal time frame for aging in a mild winter climate?
2. Mulch is supposed to be kept away from rose canes. How should the manure be used and is it a top dressing only?
3. Are there any issues I should be on alert for regarding the quality of the manure?
Thank you in advance.