Knockout roses aren’t hungry feeders. Yes! You read that right, and it is true. But this doesn’t mean they don’t need fertilizer.
Knockout roses also need fertilizer to thrive and produce healthy long-lasting blooms like all other flowering plants.
But the question:
Are all the fertilizer best for knockout roses? Obviously not. That’s why I am writing this article to introduce you to the top fertilizer for knockout roses.
Let’s stop wasting your valuable time, and see what is the best fertilizer for knockout roses today-
What's On the Page
- 1 Best Fertilizer for Knockout Roses- Comparisons
- 2 Best Fertilizer for Knockout Roses- Reviews
- 2.1 1.Jobe’s Organics 9425W Knock-Out Rose Organic Granular Fertilizer
- 2.2 2.Miracle-Gro Water Soluble Rose Plant Food
- 2.3 3.Osmocote 274850 Smart-Release Plant Food
- 2.4 4.Bayer Advanced 701110A All in One Rose and Flower Care Granules
- 2.5 5.Espoma RT4 4-Pound Rose-Tone Plant Food
- 2.6 6.Burpee Organic Rose and Bloom Granular Plant Food
- 3 How to Choose The Best Fertilizer for Knockout Rose?
- 4 When to Fertilize Knockout Roses?
- 5 How often Fertilize Knockout Roses?
- 6 What Is The Best Time to Fertilize the Knockout Roses?
- 7 How Do You Fertilize Knockout Roses?
- 8 Frequently Asked Questions
- 8.1 #Are coffee grounds good for knockout roses?
- 8.2 #Are eggshells good for knockout roses?
- 8.3 #Is Epsom salt good for knockout roses?
- 8.4 #How do I make my knockout roses bloom more?
- 8.5 #Why did my knockout roses stop blooming?
- 8.6 #What are the varieties of the knockout rose to grow more with less fertilizer?
- 9 Conclusion
In a hurry? Here is the best fertilizer for knockout rose that you may buy right now-
Best Fertilizer for Knockout Roses- Comparisons
|1.Jobe's Organics 9425W Knock-Out Rose Organic Fertilizer||3-4-3|
|Miracle-Gro Water Soluble Rose Plant Food||18-24-16|
|Osmocote 274850 Smart-Release Plant Food||15-9-12|
|Bayer Advanced 701110A Rose Care Granules||6-9-6|
|Espoma RT4 Rose-Tone Plant Food||4-3-2|
|Burpee Organic Rose and Bloom Granular Plant Food||4-6-4|
Best Fertilizer for Knockout Roses- Reviews
1.Jobe’s Organics 9425W Knock-Out Rose Organic Granular Fertilizer
If you are looking for easy to apply, nature-friendly fertilizer for your knockout roses? Here is the Jobe’s Organics 9425W knockout fertilizer for you. It is the most recommended fertilizer that is specially formulated for knockout roses.
It comes in granular form. According to the granular analysis, it contains 3% nitrogen,4% phosphate,3% potash, and some other macro and micronutrients.
The nutrients are coated for both quick release and slow-release. Quick-release nutrients dissolve fast and feed your hungry plant instantly. In contrast, slow releases nutrients release slowly and feed your plant continuously when the plant wants. Sound impressive, right?
Moreover, All the nutrients are derived from some organic and natural compounds that are completely safe for your plants, pets, kids, and environment.
You will be happy to know;
It has no toxic and harmful chemical that is proved by OMRI. Let’s see where the nutrients are derived and how they help you knockout rose plant-
Feather meal is the source of nitrogen in this fertilizer, and more nitrogen is essential for the beginning stage of the knockout rose plant. Because it plays an important role in photosynthesis and you know more photosynthesis means more green leaves and healthier plants.
Bone meal is the source of phosphorus and calcium. These macronutrients help your plant to root development and promote blooms.
Sulfate slat of potash is the source of potassium and potassium is essential for vigorous plant growth and health.
Also, it contains organic proceed manure that provides some macro and micronutrients and improves the soil health.
The best part of this fertilizer is
It contains Bizome. Biozome is a blend of healthy bacteria, Mycorrhizal fungi, and Archaea that improves the long-term soil quality promotes the plant growth, and makes your knockout plant disease, insect, and drought-resistant. Also, it has humic acid as environmental stress reviver.
To feed your established knockout rose plant-
Sprinkle 1 ½ cups of fertilizer per foot of plant spread and water the plants. Repeat the process after 4-6 weeks. It can also be used in soil preparation. Read the label for other dosages.
2.Miracle-Gro Water Soluble Rose Plant Food
Today, Miracle-Gro is providing a fertilizer that is best for every type of rose bushes including knockout rose.
What nutrients does this fertilizer contain and why is it best for knockout roses?
The NPK ratio of this fertilizer is 18-24-16. According to the NPK number, it contains 18% nitrogen and 16% potassium that accelerate the growth, lush foliage, and take care of the overall health of the knockout rose.
And it also contains a high amount of phosphorus and some other micronutrients that help you to get what you expect from your knockout roses. The beautiful, healthy, continuous, and long-lasting blooms.
It is water-soluble fertilizer that can feed your knockout roses instantly. Moreover, it may apply to other flowering plants.
Mix 1 tablespoon per gallon of water and feed your knockout roses to get healthy plants with more blooms.
3.Osmocote 274850 Smart-Release Plant Food
It contains 11 essential nutrients. All the nutrients release only the plants need. So, no need to worry about regular feeding. This fertilizer will take care of your knockout roses up to 6 months after applying once. Sounds impressive! Right?
And you know-
Plants need more fertilizer in the active growing season. Because of this, you have to apply fertilizer more rapidly. But this fertilizer is specially formulated for solving this problem. It can release faster in the growing season.
Let’s see what the ratio of three essential nutrients is-
According to the NPK number, It contains 15% nitrogen,9% phosphorus, and 12% potassium. Besides, it also contains 1.9% calcium,1.4% magnesium,4% sulfur, and in small amounts of boron, copper, iron, manganese, molybdenum, and zinc.
All the nutrients are essential in the growing and flowering stage of knockout roses.
Sprinkle the 20 grams fertilizer granule for 2 square feet, mix with the top inch of soil, and water the plant. Or mix 20 grams of granule into 1-gallon water and pour the solution on the rose plant.
4.Bayer Advanced 701110A All in One Rose and Flower Care Granules
You may know from the name-
It is an all in one rose fertilizer. That means it acts as a fertilizer, insecticide, and fungicide for your knockout roses. Isn’t it cool?
As a fertilizer, it has the 6-9-6 NPK number that promotes the growth of root, shoot, and blooms and also has 2% sulfur for chlorophyll formation.
As an insecticide, It contains imidacloprid that acts as an insect neurotoxin. It can kill most of the rose insects including aphids, beetle, bugs, caterpillars, thrips, whiteflies, and so on(see the affected insect list on the label)
And as a fungicide, it contains tebuconazole as an active ingredient. It can control the common fungal disease of knockout roses such as black spot, powdery mildew, rust, and southern blight.
In addition to that, it is also available in liquid form.
If you need fertilizer to get the healthy, disease and insect free knockout rose bushes and blooms, pick this fertilizer and apply it on plants by following the instructions.
Sprinkle 1 cupful granules (2 oz per quart water for liquid forms) on a rose bush, scratch the top inch soil, and water the rose bushes.
5.Espoma RT4 4-Pound Rose-Tone Plant Food
Espoma RT4 is a bio formulated fertilizer that especially manufactured for roses and flowers. The NPK number of this fertilizer is 4-3-2. Besides NPK, It has also 12 other nutrients including calcium and magnesium.
The good news for knockout rose lovers;
It contains 1.1% water-soluble nitrogen and 2.6% water-insoluble nitrogen.How will it help your plants? The water-soluble nitrogen instantly feeds your plant after applying but the insoluble nitrogen releases slowly and feeds your plant continuously for a long time.
Isn’t it convincing for buying this fertilizer? But- wait, it has another feature that you may like.
All the nutrients of this fertilizer are derived from organic materials such as feather meal, poultry meal, bone meal, alfalfa meal, and so on. It also contains some colony-forming units that increase the microbial activity of the soil.
Let’s be honest-
It has a smell like organic manure that you may not like.
To get healthy plants with long-lasting blooms-
Apply 1-1/4 cup around each of the knockout rose plants, scratch into the surface soil, and water the plant.
6.Burpee Organic Rose and Bloom Granular Plant Food
Burpee Rose and Bloom Granular Food is another best organic fertilizer for knockout roses that has 4% nitrogen,6% phosphorus, and 4% potassium. The perfect NPK ratio will help you to get healthy knockout roses with extra bigger blooms.
It also contains immediately and slow-release nutrients that can feed your plants continuously up to 3 months as well as instant feeding.
This is the OMRI listed organic fertilizer. The OMRI certified that it has no chemical substances and the active nutrients are derived naturally.
Sprinkle 1 cup per knockout rose plants, scratch into the surface soil, water the plant, and get healthy plants with vibrant blooms.
How to Choose The Best Fertilizer for Knockout Rose?
If you get a healthy knockout plant and bigger blooms, you should maintain a basic rule.
Spring is the growing season of knockout roses, and they need more nitrogen this time. Because nitrogen helps the plant to make bushy with dark green leaves and sturdy stems. That’s why you need to apply more nitrogen-containing fertilizer in spring. (Our recommended: Osmocote 274850 Smart-Release Plant)
On the other hand, Summer to fall is the flowering period of knockout roses. They need extra phosphorus at this time. Phosphorus needs for vibrant and bigger blooms. So, apply more phosphorus-containing fertilizer in summer to fall. (Our recommended: Bayer Advanced 701110A)
When to Fertilize Knockout Roses?
When to Start Fertilizing Knockout Roses?
Start feeding your knockout roses in spring. Remember you have to feed only the plants that have some true leaves. Never fertilize the roses when it has no leaves.
When to Stop Fertilizing Knockout Roses?
Stop feeding your roses in late summer before the frost comes. It’s preparing time for dormancy.
How often Fertilize Knockout Roses?
Many gardeners’ gurus recommend fertilizing the knockout rose once every 2-3 weeks. It should be followed. But the schedule must be varied. Some fertilizers can release nutrients slowly and some instantly.
So you should apply fertilizer more frequently for instant releasing water-soluble fertilizer. On the other hand, there is no need to apply fertilizer frequently if you apply slow-release fertilizer at once. The best idea to read the manufacturer’s instructions to avoid over-fertilizing.
What Is The Best Time to Fertilize the Knockout Roses?
Your plant can be damaged if you don’t apply fertilizer at the right time of the day. Because applying fertilizer in full sun can burn the plant leaves. That’s why fertilize your knockout roses when the weather is calm and the sun will get tired.
According to the experts, Early morning and early evening may be the best time to apply fertilizer on knockout roses. You can also change the application type. Just consider that the weather isn’t too hot.
How Do You Fertilize Knockout Roses?
You know how much and how often you have to apply fertilizer on knockout roses. Now it’s time to fertilize the plant. There are no hard and fast rules for feeding the plant. But for being safe, you should follow some basic rules.
For outdoor knockout roses-
Dig a hole about 10-12 inches across the plant. Fill the hole with the fertilizer granules, mix with the soil, and water the plant.
For potter knockout roses-
Sprinkle the fertilizer on the edge of the pot, work on the top 1-2 inches of soil, and water the plant.
Don’t apply fertilizer at the same place and avoid the base of the plants. Add water before and after fertilizing on the knockout roses. Because applying fertilizer under stress conditions is harmful to plants.
Frequently Asked Questions
#Are coffee grounds good for knockout roses?
Coffee grounds are good for knockout roses in the growing stage. Coffee grounds provide nitrogen to the plants. And you know, nitrogen is the essential plant nutrient that makes the plant healthy and bushy.
But the bad news; too much nitrogen promotes only vegetation without flowering.
#Are eggshells good for knockout roses?
Eggshells are the natural source of calcium and you know calcium is one of the required nutrients for plants. So, you can feed 1-2 tablespoons of ground eggshells to your knockout roses.
#Is Epsom salt good for knockout roses?
Yes, Chemically Epsom salt also called Magnesium sulfate. And it can provide magnesium to your plant that is an essential plant nutrient. You can mix 1 tablespoon of Epsom salt into a gallon of water and pour the solution on the plant once per month.
#How do I make my knockout roses bloom more?
Everyone loves to get the knockout roses with more and bigger blooms. But how to keep knockout roses blooming more and longer.
Apply 1 inch of water per week. Apply more if the weather is too hot. Don’t forget about the harmful effect of overwatering. Good drainage potting mix can help you reduce the chance of overwatering damage.
Feeding is necessary to make more blooms. Choose the best knockout rose fertilizer and feed your plant by following the instructions.
The insect can spread many fungal diseases and stunt plant growth. That’s why it is also necessary to get rid of insects. Organic neem oil or insecticidal soap may help you to keep the insect away from your knockout rose plants.
#Why did my knockout roses stop blooming?
It may happen for different reasons. Insects infestation, lack of watering, and feeding may be the main reasons.
But the most possible reason will be feeding incorrect fertilizer to the knockout roses. If you feed more phosphorus in spring, plants don’t develop roots and foliage. Because spring is the growing season, they need nitrogen more than phosphorus.
On the other hand, If you continue to feed more nitrogen in summer and fall, plants become bushy, and won’t produce flowers.
So feed more nitrogen in spring and more phosphorus in summer to fall. Hope your knockout roses start smiling with lots of blooms.
#What are the varieties of the knockout rose to grow more with less fertilizer?
There are different types of knockout roses. Almost every variety needs less fertilizer than regular rose plants. It is the main difference between knockout roses and regular roses.
Here is a list of some of most growing varieties of knockout roses–
- Pink Knockout Rose.
- Rainbow Knockout Rose.
- Double Knockout Roses.
- Blushing Knockout Rose.
- Sunny Knockout Rose.
Lastly, Never apply to overfertilize your knockout roses. Always read the directions dosage that manufacturers provide before applying fertilizer.
No more today!
I hope you have got the best fertilizer for knockout roses. If you get the fertilizer, don’t thank me NOW. Feed your knockout roses first and see the result.
If you get the healthy bushes with bigger blooms. Let me know. That will be the significance of my writing.