10 Best Rose Fertilizers 2025 in the United States

Neptune's Harvest offers two liquid fertilizer formulas beneficial for rose growers: a Fish & Seaweed Fertilizer with a 2-3-1 N-P-K ratio and a Rose & Flowering Formula with a 2-6-4 ratio. Both are organic, making them gentle on plants and soil while providing natural nutrients. The Fish & Seaweed option promotes strong flowers and lush foliage through a blend of fish protein and seaweed-based micronutrients, supporting overall plant health. The Rose & Flowering formula, with its higher phosphorus content, encourages more blooms and vibrant flowers, making it well suited for roses and other flowering plants.

These fertilizers are easy to apply using sprayers, hand application, or drip irrigation, accommodating different gardening preferences. They also help plants manage stress, such as drought conditions. As liquid concentrates, they require proper measurement and mixing for optimal results. Compared to slow-release granular fertilizers, they may need more frequent applications, which some gardeners might consider a trade-off for their organic and natural benefits.

For gardeners who prefer organic, easy-to-use fertilizers that support strong growth and abundant roses, Neptune's Harvest products present an effective option, especially for those comfortable with liquid feeding routines and seeking natural solutions.

The BioAdvanced All-In-One Rose and Flower Care Fertilizer is a liquid concentrate designed not only to nourish roses but also to protect them from common pests and diseases. This product combines fertilizing with insect and disease control, which is convenient for gardeners looking to simplify rose care. It contains synthetic active ingredients like Imidacloprid and Tebuconazole, offering effective protection against pests such as aphids and Japanese beetles, and diseases including Black Spot and Powdery Mildew.

The product is rainproof for up to six weeks, meaning you don't have to reapply frequently, which is helpful for busy gardeners. Application is straightforward—mix the concentrate with water and pour it at the base of your roses, avoiding leaf contact to prevent damage. If you prefer organic fertilizers, this product would not fit since it's synthetic.

This fertilizer is well-suited for gardeners who want an easy-to-use, multi-purpose product that feeds roses and protects them from pests and diseases without frequent reapplications. However, if you’re looking specifically for an organic option or a product focused solely on feeding with detailed micronutrients, this might not fully meet those needs.

Scotts Super Bloom Water Soluble Plant Food is formulated with an NPK ratio of 12-55-6, making it particularly high in phosphorus, which is essential for promoting blooms. This makes it a strong choice for not only roses but also a variety of outdoor flowers and fruiting plants. The fertilizer is water-soluble, which ensures that it feeds plants instantly when applied, a key advantage for gardeners looking for quick results. Additionally, being water-soluble reduces the risk of burning plants when used as directed, making it safer than some other fertilizer types.

The recommended application frequency is every 1-2 weeks which can be convenient for those who regularly tend to their gardens. However, the high phosphorus content might not be necessary for all stages of plant growth, and overuse could potentially lead to an imbalance in soil nutrients over time. This product is synthetic rather than organic, which may not appeal to those seeking natural gardening solutions.

Nonetheless, it is highly rated by users, with a 4.6 out of 5-star rating from over 4,000 reviews, indicating general satisfaction with its performance. It is also versatile, suitable for use in containers and bed areas, and for a variety of plant types beyond roses. For those who prioritize quick and robust bloom development and can follow a regular feeding schedule, Scotts Super Bloom is a solid choice. However, users looking for an organic option or a more balanced nutrient profile might need to explore other products.