To fertilize roses effectively, follow these guidelines based on the type and growth stage of your roses:
Frequency of Fertilizing Roses
- Established Roses:
- Fertilize every 2 to 4 weeks during the growing season, typically from early spring when new leaves appear until late summer or early fall
* Apply a slow-release fertilizer with low nitrogen in late summer to early fall to promote root growth and next year's blooms
* Reduce or stop fertilizing 6 to 8 weeks before the first expected frost to allow the plant to harden off for winter
- Newly Planted Roses:
- Start fertilizing about one month after planting once the plant shows growth.
- Feed every 3 to 4 weeks with a mild fertilizer such as fish emulsion or a high-phosphorus slow-release fertilizer to encourage root development
* Avoid full-strength fertilizers initially to prevent root burn
- Container Roses:
- Fertilize every 4 to 6 weeks during the growing season using water-soluble or slow-release fertilizers formulated for container plants
* Container roses require more frequent feeding due to nutrient leaching from watering
Seasonal Fertilizing Schedule
- Spring: Begin fertilizing as soon as new growth appears using a balanced or high-nitrogen fertilizer to support foliage and root growth
- Early Growing Season: Switch to fertilizers higher in phosphorus to promote bud and flower development
- Summer: Continue feeding every 4 to 6 weeks to support blooming, focusing on potassium to enhance flower quality
- Fall: Apply slow-release fertilizer with low nitrogen and stop feeding 6 to 8 weeks before frost
Additional Tips
- Always water roses well before and after fertilizing to help nutrient absorption and prevent root burn
- Mulching after fertilizing helps retain moisture and makes nutrients more available
- Watch for signs of nutrient deficiency (yellow leaves, poor blooms) or over-fertilization (excessive leafy growth with few flowers) and adjust feeding accordingly
In summary, fertilize roses approximately every 2 to 4 weeks during active growth, taper off feeding before winter, and adjust frequency for new or container roses. This balanced approach promotes healthy growth and abundant blooms year after year
