If you plant your rose in the Fall wait until Spring to begin fertilizing. Start fertilizing with liquid fertilizer at strength or use fish fertilizer at full strength. If you plant in the Spring or Summer: start about one month after planting and continue monthly until August. Always make your last fertilizer application in August so that the roses may harden off for winter.
The second year you may use granular fertilizer sparingly or liquid fish at full strength monthly until August.
The third year you can use granular fertilizer. The third year use all fertilizers at full strength.
出差在外,正好有空钻研,翻译如下: