Fertilizer for rosemary ensures that either when growing rosemary in pots or growing rosemary indoors they will always supply enough nutrients to your plant all year round.

The best fertilizer for rosemary should be all-purpose fertilizer, which offers a wide array of nutrients to promote a healthy and disease-free rosemary plant.

Rosemary is a hungry plant; hence, it is only compatible with NPK fertilizers with a ratio of 20(N)-20(P)-20(K), which is strictly 100% non-acidic.

We did all the footwork for you, which includes testing and comparing the efficiency of different rosemary feeds and fertilizes on the market.

Below find our detailed reviews of rosemary fertilizer brands worth trying this season round.

Also, Check 7 Best Soils for Rosemary 

Reviews:7 Best Fertilizer For Rosemary

1. Osmocote 277160 Smart-Release Plant Food Rosemary Fertilizer Review

Looking for a better and long-term way to increase the growth of your rosemary.Well then, Osmocote Plant Food will be 100% compatible with your rosemary.

The granular nature ensures that your rosemary plants are provided with sufficient nutrients for up to four months by this Smart-Release Osmocote fertilizer.

Strong root development in rosemary promotes the overall leaf and plant size. Both the mint flavour and the pinelike scent will be enhanced by the high amount of potassium present. The combination ofthe  NPK ratio of nitrogen and phosphorus makes this to be compatible with perennials

High nitrogen ensures vigorous tips and top growth that will form more branches within a short period of time. The NPK ratio of this plant food for rosemary is 20(N)-20(P)-20(K). Application is as simple as using this Osmocote fertilizer designed to be directly used by the plant.

When sprinkling this fertilizer around the base of the rosemary plant, maintain an application rate of 1 scoopful of Osmocote fertilizer per every 4 square feet or per every 2 gallons.

When determining the fertilizer, keep in mind that 1 scoopful of Osmocote fertilizer is equal to 3 tablespoons of the same fertilizer.

2. Jobe’s Organics  Slow Release Fertilizer For Rosemary Plants Review

On this rosemary plant fertilizer, the list finds Jobe’s Organics 09686. Regardless of whether you will be growing your rosemary as annuals or perennials, the slow-release nature of this fertilizer ensures sufficient nutrient supply. It has a high phosphorus content to aid in strong root system formation.

It comes in granular form, making it the most preferred slow-release fertilizer for the rosemary plant. The granules are slightly coated with a quality organic layer to ensure that nutrient content in the fertilizer will only be released when your rosemary plant needs.

Since rosemary is an acid-loving plant, the high nitrogen content of these fertilizers ensures lush vegetation development. The low potassium and phosphorus content ensures that vegetative growth is efficiently promoted to increase the rosemary plant’s overall growth.

Being 100% organic rosemary blood meal, you will enjoy an organic scent free from inorganic compounds. It is also safe for pets and humans as the raw material was obtained from organic matter.

3. Osmocote 277160 Smart-Release Plant Food Rosemary Fertilizer Review

Looking for a better and long-term way to increase the growth of your rosemary? Well then, Osmocote Plant Food will be 100% compatible with your rosemary. The granular nature ensures that your rosemary plants are provided with sufficient nutrients for up to four months by this Smart-Release Osmocote fertilizer.

Strong root development in rosemary promotes overall leaf and plant size. The high amount of potassium enhances the mint flavor and pine-like scent. The combination of the NPK ratio of nitrogen and phosphorus makes rosemary compatible with perennials.

High nitrogen ensures vigorous tips and top growth that will form more branches within a short period of time. The NPK ratio of this plant food for rosemary is 20(N)-20(P)-20(K). Application is as simple as using this Osmocote fertilizer designed to be directly used by the plant.

Pros:

• Long-lasting effect
• Encourages root growth
• Enhances rosemary flavor
• Smart-release granules
• Easy to apply
• Promotes branching
• Improves plant resilience

Cons:

• Not organic
• Requires precise measurement
• Slightly expensive

4. Miracle-Gro Water Soluble All Purpose Plant Food Rosemary Fertilizer Review

If you need quick results and want lush rosemary growth, Miracle-Gro Water Soluble Plant Food is an excellent choice. It dissolves easily in water and immediately reaches the roots for fast absorption. This ensures that your rosemary benefits from essential nutrients without delay.

It contains a balanced NPK ratio of 24-8-16, making it highly effective for rosemary plants. The increased nitrogen content helps stimulate leaf and stem growth. Additionally, phosphorus supports strong root structures and healthy flower development.

Using this fertilizer weekly guarantees consistent growth and a healthier plant structure. Moreover, it is easy to apply using a watering can or garden sprayer. Just mix the required amount with water, and your rosemary will thrive effortlessly.

Pros:

• Quick absorption
• Easy to mix
• Boosts green growth
• Highly soluble
• Strengthens roots
• Can be used weekly
• Multi-purpose use

Cons:

• Not slow-release
• Can burn if overused
• Requires frequent application

5. Jobe’s Organics Herb Fertilizer Spikes Rosemary Fertilizer Review

For gardeners who prefer organic fertilizers, Jobe’s Organics Herb Fertilizer Spikes are an excellent option. These spikes provide a slow release of nutrients directly into the soil, ensuring rosemary plants receive continuous nourishment. Plus, they are environmentally friendly and free from synthetic chemicals.

The unique formula contains beneficial microbes that improve soil health and encourage better nutrient absorption. Additionally, the fertilizer is enriched with bone meal and feather meal, which promote strong roots and overall plant health. This makes it a great choice for rosemary plants in pots or garden beds.

Application is simple as you only need to insert the spikes into the soil. Since the nutrients are released gradually, the risk of overfeeding or burning the plants is minimized. As a result, rosemary receives a steady supply of essential elements for optimal growth.

Pros:

• 100% organic
• Improves soil health
• Slow-release formula
• Easy to use
• Contains beneficial microbes
• Enhances root growth
• Safe for all herbs

Cons:

• Can attract pests
• Takes time to work
• Needs reapplication

5. Dr. Earth Organic 5 Tomato, Vegetable & Herb Fertilizer Rosemary Fertilizer Review

Dr. Earth Organic 5 is a premium choice for those who want chemical-free nutrition for their rosemary plants. Made from natural ingredients, it supports strong plant growth while being safe for the environment. Additionally, it contains probiotics and mycorrhizae, which enhance soil structure and root development.

With an NPK ratio of 4-6-3, this fertilizer ensures balanced nutrition for rosemary plants. The high phosphorus content supports flower and root development, while nitrogen promotes lush green growth. The organic materials break down slowly, offering extended feeding.

Application is straightforward, as it can be mixed into the soil before planting or sprinkled around existing plants. This ensures steady nutrient availability without causing fertilizer burn. As a result, rosemary plants thrive and produce aromatic, flavorful leaves.

Pros:

• Fully organic
• Improves soil structure
• Long-lasting feeding
• Safe for all plants
• Enhances root health
• Contains probiotics
• Easy to apply

Cons:

• Slight odor
• Works slowly
• Higher price

6. Espoma Organic Garden-Tone Herb and Vegetable Food Rosemary Fertilizer Review

Espoma Organic Garden-Tone is specifically designed for herbs like rosemary, ensuring optimal growth and aroma. Its natural composition is ideal for gardeners who prefer chemical-free fertilizers. Additionally, it contains beneficial microbes that improve soil fertility.

The NPK ratio of 3-4-4 ensures a balanced supply of nutrients for rosemary plants. With moderate nitrogen, the leaves remain vibrant, while phosphorus supports strong root formation. The added calcium also enhances the plant’s overall strength and resistance to diseases.

Using this fertilizer is easy since it can be applied directly to the soil and watered in. It releases nutrients gradually, reducing the risk of overfeeding. Furthermore, it is safe for use in organic gardening and does not harm beneficial insects.

Pros:

• Organic certified
• Supports healthy roots
• Slow-release formula
• Enhances plant aroma
• Improves soil quality
• Safe for pollinators
• Easy to spread

Cons:

• Has a mild smell
• Needs regular application
• Can attract bugs

7. Down to Earth Organic Rose & Flower Mix Rosemary Fertilizer Review

Down to Earth Organic Rose & Flower Mix is a well-balanced fertilizer that works exceptionally well for rosemary plants. It contains organic materials like fishbone meal and alfalfa meal, which promote strong growth. Additionally, its natural formulation ensures that rosemary remains chemical-free.

With an NPK ratio of 4-8-4, this fertilizer supports both root and flower development. The phosphorus content strengthens the plant’s ability to absorb nutrients efficiently. Plus, potassium enhances rosemary’s resistance to environmental stress.

Application is simple as it can be mixed into the soil before planting or sprinkled on top. The slow-release nature ensures long-lasting feeding. As a result, rosemary plants grow vigorously and maintain their aromatic properties.

Pros:

• 100% organic
• Contains fishbone meal
• Strengthens plant resilience
• Supports flower growth
• Slow-release feeding
• Improves soil structure
• Safe for all herbs

Cons:

• Has a fishy smell
• Can attract animals
• Takes time to work

8. Root Supplement Fertilizer For Rosemary Bush-Best Roots Fertilizer For Rosemary

If you are growing your rosemary as a bush, root supplements and protectors will help establish a strong root system. Strong root systems ensure that your plant can access water and vitamins from the soil after fertilizer application.

Whether you grow rosemary indoors or outdoors, this root protection ensures that your plant’s roots remain free from root rot even during winter, when the temperature is extremely low.

The main ingredient of this fertilizer is phosphorus, which supports rosemary bushes’ strong root development. You are required to add the root supplement and protector content to your watering can and top it up with fresh water to the watering can level. Consider wetting both the root region and leaves for the best results.

The potassium present ensures that apart from enhancing the dark green color of rosemary bush.Also, the pine-like scent of the rosemary bush will also be a property, making it 100% suitable. One the rosemary plant care indoors task is maintaining healthy root which happens to be the main function   of this root supplement and protector

9. Bonide 099 40-Ounce Wilt Stop Rosemary Protector

Ensuring that your rosemary bush is free from wilting is considered using the Bonide 099 40-Ounce. The main ingredients in this fertilizer are phosphorus which ensures that strong roots re professionally established in both indoors, potted our outdoor rosemary plant varieties.

The Anti-transpirant plant protector nature of this rosemary fertilizer ensures that your plant is also effectively protected from insects, deer, and diseases. After using this plant, the establishment of strong roots is guaranteed, hence the rosemary plant shock is professionally protected.

The nutrient magnesium was sparingly added to ensure that the soil pH where you are growing your rosemary has been moderated to suit the slightly acidic soil pH requirement of this soil. The manufacturer added a slight amount of boron in this fertilizer to ensure that reviving rosemary will be easy.

10. Diatomaceous Earth fertilizer for rosemary bonsai

Finally, our last product on this list is the Diatomaceous Earth DE10 as we found o it to be 100% compatible with rosemary bonsai what  is more exciting is that  you will have cases of poisoning after using  this fertilizer  as it is 100%  organic. Comes with quality packaging that allows you to store the remaining fertilizer safely.

After the Institute of organic minerals review this Diatomaceous Earth DE10 it was 100% approved. High nitrogen content promotes lush vegetation growth. While the slightly low amount of phosphorus ensures the formation of the reliable rosemary root system.

This product is wholly produced on US soil, so its performance and expected results are 100% guaranteed. No additives were added to this fertilizer, thus ensuring that all the rosemary bonsai plants you are going to produce meet international and local market standards.

Fertilizer For Rosemary FAQS (Frequently Asked Questions)

1.What Kind Of Fertilizer For Rosemary

By being drought tolerant and 100% deer resistant, rosemary requires slightly less fertilizer, feed, and water than other hungry plants. If you will be growing your rosemary in pots, slow-release fertilizers that come in tablet, granular, or pellet form are preferred.

If you will be growing your rosemary as a shrub, consider liquid fertilizers, as they are easier to apply. For dark green leaves, fertilizer brands rich in iron will work great. Growing rosemary indoors requires strong root establishment, hence a fertilizer with a high phosphorus ratio in an NPK fertilizer will be the most appropriate.

2.How To Apply Fertilizer To Rosemary?

If you are not familiar with which method you should use to fertilize your rosemary, consider reading the instructions outlined by the individual fertilizer manufacturer’s container and specifications. If you are in a hurry to buy Fertilizer for Rosemary, consider going for a ready-to-use fertilizer with a spray container.

For liquid fertilizer, you can use spray containers, watering cans, Sprayers for ATV or UTV .But in case you are after a slow-release, consider getting pellets or tablets fertilizers, and spread the fertilizers around the base of the rosemary evenly. Such fertilizer is also efficient when growing rosemary indoors or when growing rosemary in pots

3.How Often To Fertilizer Rosemary?

Supply your rosemary with fertilizer during early spring as they are semi-woody perennial. The next rosemary fertilizing cycle should be carried out during the summer season as it is also the rosemary growing phase.

During this phase, rosemary fertilizer should have high nitrogen content. Other brands that have phosphorus content should also be allowed so as to promote strong rosemary plant roots.

3.When Is The Best Time To Fertilize Rosemary

So, to get your rosemary off to an amazing start of a blooming season, consider fertilizing it during early spring. Consider using a quality general-purpose fertilizer with a slightly high amount of nitrogen.

High nitrogen content during spring ensures that, since there is high growth, late lush vegetation will be achieved. To ensure that the mint pungent fragrance is enhanced in rose Mary consider going for iron-rich fertilizer during summer or even during late spring

4.How To Revive Rosemary?

If your rosemary is witling or drying and you are looking for ways to enjoy the pinelike scent or pungent flavor, consider treating, cutting back, transferring to a new, bigger pot, or adding the most appropriate NPK fertilizers for rosemary in a ratio of 20(N)-20(P)-20(K).

Rosemary with leaves turning yellow should be supplied with fertilizer with high iron content. The high potassium content in the NPK fertilizer ratio of 20(N)-20(P)-20(K) ensures that the pinelike scent will be enhanced. Wilting rosemary plants should be supplied with fertilizers rich in phosphorus to promote root growth and establishment.

Homemade Fertilizer For Rosemary

For that organic rosemary growing enthusiast coming up with a Homemade Fertilizer for Rosemary is very easy. You are only required to add 1 full tablespoon of organic apple cider vinegar to exactly 1 gallon of freshwater and mix thoroughly

When watering your plants, consider using the concoction or the mixture above on your plants. The role of apple cider vinegar is to ensure that nutrients will be available. It is recommended that for best results consider using this homemade fertilizer for rosemary when the soil is slightly dry

Conclusion

We found this to be the fertilizer brand compatible with rosemary grown in pots. But for individuals like me who prefer growing their rosemary as herbs, this fertilizer is definitely worth checking out.

Finally, if you will be growing rosemary as a quality perennial crop, ensure that rosemary roots are not disturbed. Consider using this fertilizer, which is a prime rosemary soil aerator, as it is as effective as mechanical tilling.

Resources

1. Fertilizer-Machine Fertilizer Production Line
2. Home Guides.Sfgate