Hi Francis –
Roses aren’t too choosy about the type of fertilizer they receive, as long as they are being fed. Roses grown in containers should be fed with a water-soluble liquid fertilizer on a regular basis.
When choosing the best fertilizer for your roses, look for a balanced, high-quality fertilizer (4-4-4) that includes macro and micronutrients. Roses require the following micro-nutrients for healthy growth:
• Calcium (Ca): Builds cell wall strength, which helps your plants fight off predators
• Magnesium (Mg): Promotes dark green leaves, flower color, flower production, and can help flush harmful salts through the soil; we recommend Epsom Salts
• Sulfur (S)
• Copper (Cu)
• Iron (Fe)
• Manganese (Mn)
• Zinc (Zn)
For your best blooms, we recommend using Alaska Fish Fertilizer, Neptune’s Harvest Fish & Seaweed or Neptune’s Harvest Fish Fertilizer.
Happy gardening!