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.

The BioAdvanced All-In-One Rose and Flower Care is a well-rounded choice for those looking to enhance their rose plants' health with minimal effort. Priced for convenience, this granule-based fertilizing product also serves as an insect killer and fungicide, making it a three-in-one solution. It works by promoting strong roots and vibrant blooms thanks to its effective formulation. The fertilizer is synthetic, which ensures a quick uptake of nutrients by the plants but may not be suitable for those specifically seeking organic alternatives.

The product also controls pests like Japanese Beetles, Aphids, and Leafhoppers, and combats diseases such as Black Spot and Powdery Mildew with its fungicidal properties. One notable advantage is its rainproof protection that lasts up to six weeks, reducing the need for frequent reapplication. However, the restriction in New York might be a limitation for some users.

The granule form makes it easy to apply, and it can be used for both indoor and outdoor plants, adding to its versatility. The product size is manageable (4 pounds) and should cover a reasonable number of plants. It's a strong choice for gardeners looking for an all-in-one rose care solution, especially those dealing with pest and disease issues, though it may not meet the needs of organic gardeners.