10 Best Rose Fertilizer And Disease Control Knock Out of 2026

Last updated on 04/04/2026
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Best Choice
1
9.8
Exceptional
Great Big Roses – Soil and Rose Fertilizer Booster to Grow The Best Roses and Flowers; Rose Food Compost Extract for Rose Bush, 1 Gallon Concentrate (Makes 32 Gallons)
Great Big Plants

Great Big Roses – Soil and Rose Fertilizer Booster to Grow The Best Roses and Flowers; Rose Food Compost Extract for Rose Bush, 1 Gallon Concentrate (Makes 32 Gallons)

Why we love it
  • Improves soil structure effectively.
  • Boosts fertilizer uptake significantly.
  • Easy to use and apply.
Main Highlights
  • IMPROVES SOIL: Our soil and rose fertilizer booster infuses soil with a combination of selected ingredients that work together to improve soil structure and optimize soil conditions for increased plant vigor.
  • IMPROVES ROSE FERTILIZER UPTAKE: Our compost extract boosts the effects of fertilizer for roses and nutrient-rich soils. The formula brings benefits right into the root zone of the rose bush to convert more rose bush fertilizer into plant usable forms. Proven to make rose fertilizer work better.
  • LOADED WITH UNIQUE INGREDIENTS: Our rose fertilizer booster's proprietary compost extract supplies all the benefits of traditional compost, plus bioavailable humic acids, over 70 chelated trace minerals and seaweed, for your rose bush.
  • STARTS WORKING RIGHT AWAY: Immediately flows to the root zone of your rose bush. Our formulation is a soil and rose food fertilizer booster that is designed to start working right away for fast results.
  • EASY TO USE: Just mix 4 ounces of our all in one compost extract with a gallon of water. Apply a pint or more of the soil and fertilizer booster around the base of the plant, depending on the size of the rose, plant, or bush. No digging or tilling required.
  • EARTH FRIENDLY: This rose fertilizer booster is registered as an Organic Input Material under the National Organic Program of USDA. Made in the USA by a family-owned, small business.
9.8
Exceptional
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Best Value
2
9.6
Superb
Nelson Plant Food Rose Food for All Types of Roses Climbing Tea Knock Outs Grandiflora with Five Sources of Nitrogen Nutri Star 18-14-10 (4 LB)
Nelson Plant Food

Nelson Plant Food Rose Food for All Types of Roses Climbing Tea Knock Outs Grandiflora with Five Sources of Nitrogen Nutri Star 18-14-10 (4 LB)

Why we love it
  • Promotes lush foliage and blooms.
  • Boosts tolerance to dry conditions.
  • Immediate results with lasting benefits.
Main Highlights
  • PLANT FOOD: Plant Food For All Roses featuring (NPK) Nitrogen (18%), Phosphate (14%), Soluble Potash (10%). Contains four sources of nitrogen and potassium to promotes lush foliage, strong stems and large, colorful blooms.
  • FERTILIZER FOR ROSES: Excellent source of nutrients and minerals for in ground and container growing roses including, but not limited to: Tea Roses, Antique Roses, Floribunda, Climbing Roses, Knockout Roses, Grandiflora Roses, Miniature Roses, Rose Banksias.
  • PLANT FERTILIZER: Helps roses to improve tolerance to dry weather conditions, in addition to promoting heavy flowering while increasing the size and strengths of the plant. Apply every 2 weeks in the beginning of spring and then every 60 days during the growing season.
  • IMMEDIATE RESULTS: NutriStar works with the soil and the soil biology to provide your flowering roses with the best nutrition at the right time and in the right amount. Plants get an immediate boost upon application, coupled with lasting benefits that continue to feed.
  • SUPERIOR QUALITY: The leading landscapers' choice for flowers for over 30 years. Nelson Plant Food builds products that are horticulturally correct for each type of plant. Extensive research is done to make sure that plants are fed correctly with each NutriStar or ColorStar product.
9.6
Superb
Amazon Logo
3
9.5
Superb
Great Big Roses – Soil and Rose Fertilizer Booster to Grow The Best Roses and Flowers; Rose Food Compost Extract for Rose Bush, 32 Ounce Concentrate (Makes 8 Gallons)
Great Big Plants

Great Big Roses – Soil and Rose Fertilizer Booster to Grow The Best Roses and Flowers; Rose Food Compost Extract for Rose Bush, 32 Ounce Concentrate (Makes 8 Gallons)

Why we love it
  • Improves soil structure effectively.
  • Enhances fertilizer absorption quickly.
  • Loaded with unique ingredients.
Main Highlights
  • IMPROVES SOIL: Our soil and rose fertilizer booster infuses soil with a combination of selected ingredients that work together to improve soil structure and optimize soil conditions for increased plant vigor.
  • IMPROVES ROSE FERTILIZER UPTAKE: Our compost extract boosts the effects of fertilizer for roses and nutrient-rich soils. The formula brings benefits right into the root zone of the rose bush to convert more rose bush fertilizer into plant usable forms. Proven to make rose fertilizer work better.
  • LOADED WITH UNIQUE INGREDIENTS: Our rose fertilizer booster's proprietary compost extract supplies all the benefits of traditional compost, plus bioavailable humic acids, over 70 chelated trace minerals and seaweed, for your rose bush.
  • STARTS WORKING RIGHT AWAY: Immediately flows to the root zone of your rose bush. Our formulation is a soil and rose food fertilizer booster that is designed to start working right away for fast results.
  • EASY TO USE: Just mix 4 ounces of our all in one compost extract with a gallon of water. Apply a pint or more of the soil and fertilizer booster around the base of the plant, depending on the size of the rose, plant, or bush. No digging or tilling required.
  • EARTH FRIENDLY: This rose fertilizer booster is registered as an Organic Input Material under the National Organic Program of USDA. Made in the USA by a family-owned, small business.
9.5
Superb
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4
9.3
Superb
Bonide Captain Jack's Rose Rx 4-in-1 Insect & Disease Control, 16 oz Concentrate Neem Oil for Organic Gardening
Bonide

Bonide Captain Jack's Rose Rx 4-in-1 Insect & Disease Control, 16 oz Concentrate Neem Oil for Organic Gardening

Why we love it
  • Four garden products in one.
  • Organic gardening approved formula.
  • Easy-to-use ready-to-mix spray.
Main Highlights
  • Rose Rx Ready-to-Use Spray from Captain Jack's acts as 4 garden products in 1. Protect your home garden from insects, nematodes, mites and common fungal diseases.
  • Clarified Hydrophobic Extract of Neem Oil protects your garden from common fungal diseases including rust, powdery mildew and more. Apply to house plants, roses, trees, shrubs and more for effective protection against garden diseases.
  • Rose Rx Spray is an effective insecticide that controls and repels many insect pests including fruit flies, beetles, aphids, caterpillars and other listed bugs.
  • Approved for Organic Gardening, Rose Rx 4-in-1 spray can be used up to the day of harvest. This product is specially formulated for use on roses, flowers, houseplants, trees shrubs, fruits, vegetables and more.
  • This product arrives ready-to-mix with water. To use, mix according to label instructions and shake well. Apply to affected plants as a foliar spray or a soil drench. For full use instructions, please see product label.
9.3
Superb
Amazon Logo
5
9.2
Superb
Save 13%
Jobe’s Organics Rose Fertilizer Spikes, 3-5-3 Time Release Fertilizer for All Flowering Shrubs, 10 Spikes per Package (2, Original Version)
Jobe's Organics

Jobe’s Organics Rose Fertilizer Spikes, 3-5-3 Time Release Fertilizer for All Flowering Shrubs, 10 Spikes per Package (2, Original Version)

13% Off
Why we love it
  • Organic certification assures safety.
  • Biozome enhances soil health.
  • No mess, easy application.
Main Highlights
  • Organic fertilizer spikes for roses and all flowering shrubs; Pre-measured spikes provide nourishment at the roots OMRI listed for organic gardening by USDA
  • OMRI listed for organic gardening by USDA; Certified organic means no synthetic chemicals
  • "Jobe’s Biozome improves soil conditions; Helps your garden resist disease, insects, drought and other unfavorable conditions within a growing season "
  • Contains Jobe Biozome; Extremely aggressive proprietary microorganism archaea that aggressively breaks down material for faster results
  • "No mess easy to use spikes; Prevents waste and run-off; Fertilizer analysis: (3-5-3) 10 spikes per waterproof resealable package "
9.2
Superb
Save 13%
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6
9.0
Superb
Jobe's 04102 Rose Fertilizer Spikes, 10, Multicolor (2 Pack)
Jobe's Organics

Jobe's 04102 Rose Fertilizer Spikes, 10, Multicolor (2 Pack)

9.0
Superb
Amazon Logo
7
9.0
Superb
Knock Out Rose - Double Knock Out #1
Star Roses Knock Out Series

Knock Out Rose - Double Knock Out #1

Main Highlights
  • With the same breeding and attributes of the original Knock Out Rose, but with a flower that looks like a traditional rose. Blooms last from spring to first frost.
9.0
Superb
Amazon Logo
8
9.0
Superb
Save 26%
Knock Out 2 Gal. Double Pink Rose Shrub
Generic

Knock Out 2 Gal. Double Pink Rose Shrub

26% Off
Why we love it
  • Stunning large double pink blooms.
  • Thrives in diverse climate zones.
  • Easy to maintain and care.
Main Highlights
  • Large, double pink blooms
  • USDA zones 5-11
  • Plant will ship dormant if ordered mid-fall to mid-spring
  • Deciduous - loses its leaves during the winter months
  • Water twice per week until established, then water once per week
9.0
Superb
Save 26%
Amazon Logo
9
8.8
Excellent
Save 36%
1 Gallon Easy Bee-zy Knock Out Rose
Generic

1 Gallon Easy Bee-zy Knock Out Rose

36% Off
Why we love it
  • Thrives in a wide range.
  • Beautiful blooms from spring through fall.
  • Perfect for any landscaping project.
Main Highlights
  • Thrives in USDA zones 4-11
  • Grows to mature size 36 inches W x 36-48 inches H
  • Deciduous – Foliage loss in winter and new growth in spring
  • Full Sun; blooms spring through fall
  • Used in containers, landscapes, and as accents
  • Recommended spacing 36 inches
  • Botanical Name: Easy Bee-zy Knock Out ‘SRPylwko’ PPAF
  • Ships Dormant winter through early spring
  • Plants are trimmed at times when shipped to promote plant health
8.8
Excellent
Save 36%
Amazon Logo
10
8.7
Excellent
Save 17%
Miracle-Gro Water Soluble Rose Plant Food, 1.5 lb
Miracle-Gro

Miracle-Gro Water Soluble Rose Plant Food, 1.5 lb

17% Off
Why we love it
  • Grows bigger, more beautiful roses.
  • Starts feeding instantly for results.
  • Safe to use without burning.
Main Highlights
  • Miracle-Gro Water Soluble Rose Plant Food grows bigger, more beautiful roses versus unfed plants
  • This rose food starts to feed instantly
  • Feed with our rose fertilizer every 7 to 14 days
  • Use with Miracle-Gro Garden Feeder or any watering can
  • Guaranteed not to burn when used as directed
8.7
Excellent
Save 17%
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📊We scanned 1471 products
🔍
We reviewed the most relevant Rose Fertilizer And Disease Control Knock Out offers across Amazon and leading retailers, covering major brands and models. Our shortlist features trusted names like Great Big Plants, Nelson Plant Food, Bonide, Jobe's Organics, Star Roses Knock Out Series, Generic, Miracle-Gro, known for dependable quality and smart design.
⭐
To determine today's best Rose Fertilizer And Disease Control Knock Out, we analyzed 7356 real customer and expert reviews, focusing on satisfaction, real-world performance and long-term reliability. We also weigh each review's relevance, authenticity and freshness for a fair comparison.

Here's what we found:

🏆 #1
Great Big Roses – Soil and Rose Fertilizer Booster to Grow The Best Roses and Flowers; Rose Food Compost Extract for Rose Bush, 1 Gallon Concentrate (Makes 32 Gallons)

Our overall winner is Great Big Roses – Soil and Rose Fertilizer Booster to Grow The Best Roses and Flowers; Rose Food Compost Extract for Rose Bush, 1 Gallon Concentrate (Makes 32 Gallons) by Great Big Plants. It stands out for the right balance of quality, performance and value.

✨ What sets it apart:
✓Improves soil structure effectively.
✓Boosts fertilizer uptake significantly.
✓Easy to use and apply.
💎 Best Value
Nelson Plant Food Rose Food for All Types of Roses Climbing Tea Knock Outs Grandiflora with Five Sources of Nitrogen Nutri Star 18-14-10 (4 LB)

The best value for most shoppers is Nelson Plant Food Rose Food for All Types of Roses Climbing Tea Knock Outs Grandiflora with Five Sources of Nitrogen Nutri Star 18-14-10 (4 LB) by Nelson Plant Food, with consistently high satisfaction across expert and customer reviews.

💰 Best Deal
1 Gallon Easy Bee-zy Knock Out Rose

The strongest deal right now for Rose Fertilizer And Disease Control Knock Out is 1 Gallon Easy Bee-zy Knock Out Rose at Generic, currently at 36% off.

🔄Our Rose Fertilizer And Disease Control Knock Out ranking is updated regularly to reflect new releases and price changes—check back for the latest picks and deals.