10 Best Impatiens Fertilizers for Vibrant, Long-Lasting Blooms

I’ve found that Miracle-Gro Water Soluble All Purpose Plant Food consistently delivers the best results for impatiens, promoting vibrant blooms with its balanced nutrient formula that feeds every 1-2 weeks. For enhanced flowering, I recommend Scotts Super Bloom with its high-phosphorus 12-55-6 ratio, while Miracle-Gro Pour & Feed offers convenient ready-to-use application. Osmocote Smart-Release provides six months of sustained nutrition, and Jobes Fertilizer Spikes deliver mess-free feeding for busy gardeners seeking spectacular displays throughout the growing season.

We are supported by our audience. When you purchase through links on our site, we may earn an affiliate commission, at no extra cost for you. Learn more. Last update on 11th September 2025 / Images from Amazon Product Advertising API.

Notable Insights

• Miracle-Gro Water Soluble All Purpose Plant Food offers excellent value with 4.7/5 stars and feeds every 1-2 weeks.
• High-phosphorus fertilizers like Scotts Super Bloom (12-55-6) promote vigorous blooming with visible improvements within days.
• Slow-release options like Osmocote Smart-Release provide up to six months of nutrition without risk of burning plants.
• Jobes Flowering Plant Fertilizer Spikes deliver pre-measured nutrition for 60 days with simple insertion application.
• Maintain soil pH between 6.0-7.0 and use balanced 10-10-10 fertilizers for optimal nutrient absorption and plant health.

Miracle-Gro Water Soluble All Purpose Plant Food (3 lbs)

When you’re seeking exceptional results for your impatiens without the complexity of specialized formulations, Miracle-Gro Water Soluble All Purpose Plant Food stands out as the top choice for gardeners who value simplicity and proven effectiveness. This 3-pound powder concentrate delivers essential nutrients that instantly feed your flowering plants, promoting bigger blooms and healthier foliage throughout the growing season. You’ll appreciate how easily it dissolves in water, creating a complete feeding solution that won’t burn your delicate impatiens when applied according to directions. With coverage extending to approximately 600 square feet and feeding schedules every 1-2 weeks, this versatile fertilizer guarantees your impatiens receive consistent nutrition for vibrant, long-lasting displays.

Best For: Gardeners seeking a simple, effective, and affordable fertilizer solution for all types of plants including flowers, vegetables, trees, and houseplants who want proven results without complicated application processes.

Pros:

• Easy-to-use water-soluble formula with clear instructions that works for all plant types and won’t burn when used as directed
• Excellent value with 3-pound container providing extensive coverage (600 sq ft) and lasting multiple growing seasons
• Outstanding customer satisfaction with 4.7/5 stars from over 64,000 reviews and #1 ranking in garden fertilizers

Cons:

• Risk of leaf burning if overused or applied at full strength to sensitive plants
• Requires consistent reapplication every 1-2 weeks throughout growing season for optimal results
• Some customers have reported occasional order fulfillment and shipping issues from certain sellers

Scotts Super Bloom Water Soluble Plant Food (2 lb, NPK 12-55-6)

Gardeners seeking explosive flower production will find Scotts Super Bloom Water Soluble Plant Food delivers exceptional results with its phosphorus-rich 12-55-6 NPK formula. The exceptionally high phosphorus content promotes vigorous blooming in your impatiens, while the balanced nitrogen and potassium support healthy foliage and root development. You’ll appreciate the convenient water-soluble formula that feeds instantly, requiring simple mixing with water every 1-2 weeks for peak performance. The 2-pound container provides medium coverage for containers and garden beds, ensuring your impatiens receive consistent nutrition throughout the growing season. Customer reviews consistently highlight quick visual improvements, with many gardeners reporting enhanced bloom quality and quantity within days of application.

Best For: Gardeners who want to maximize flower production and bloom quality in outdoor flowering plants, fruiting vegetables, and container gardens with a convenient water-soluble fertilizer.

Pros:

• High phosphorus content (55%) specifically designed to promote vigorous blooming and increased flower quantity and quality
• Water-soluble formula provides instant feeding with easy application every 1-2 weeks
• Safe for plants when used as directed and won’t burn, with many customers reporting visible improvements within days

Cons:

• Requires frequent reapplication every 1-2 weeks throughout the growing season for optimal results
• Medium coverage from 2-pound container may not be sufficient for large garden areas
• High phosphorus formula may not be ideal for plants that don’t require bloom enhancement or are sensitive to phosphorus buildup

Miracle-Gro Pour & Feed Plant Food Fertilizer (32 oz.)

Busy gardeners who want hassle-free plant care will find Miracle-Gro Pour & Feed Plant Food Fertilizer perfectly suited for maintaining vibrant impatiens without the measuring mess. This ready-to-use liquid formula eliminates mixing requirements, allowing you to apply fertilizer directly from the bottle to your container plantings. The 32-ounce size provides enough product for year-round feeding schedules, making it particularly valuable for extensive impatiens displays. You’ll need to feed your plants every one to two weeks throughout the growing season for ideal bloom production. With over 5,400 customer ratings averaging 4.5 stars, this fertilizer consistently delivers visible improvements in plant health and flowering performance within weeks of application.

Best For: Busy gardeners who want hassle-free plant care and need a ready-to-use liquid fertilizer for container plants without the mess of mixing.

Pros:

• Ready-to-use formula requires no mixing or measuring, making application quick and convenient
• 32-ounce size provides enough product for year-round feeding of multiple container plants
• High customer satisfaction with 4.5 out of 5 stars from over 5,400 ratings and visible results within weeks

Cons:

• Some users experience packaging issues with loose caps causing leaks during shipping or storage
• Requires frequent application every 1-2 weeks throughout the growing season
• Limited to container plants only, not suitable for in-ground garden beds

Miracle-Gro Shake N Feed All Purpose Plant Food (4.5 lbs)

For gardeners who prefer a single fertilizer that works across their entire garden, Miracle-Gro Shake N Feed All Purpose Plant Food delivers exceptional versatility in a convenient 4.5-pound package. You’ll find this granular fertilizer particularly effective for impatiens because it nourishes both above and below the soil, providing essential micronutrients that create stronger, more vibrant blooms compared to unfed plants. The application process couldn’t be simpler—you’ll sprinkle it evenly onto soil, work it into the top 1-3 inches for in-ground plants, then water thoroughly to activate feeding. With its three-month feeding duration, you’ll only need to reapply four times per growing season, making maintenance effortless while ensuring your impatiens receive consistent nutrition throughout their blooming period.

Best For: Gardeners who want a versatile, low-maintenance fertilizer that works across their entire garden for flowers, vegetables, and herbs both indoors and outdoors.

Pros:

• Long-lasting nutrition that feeds plants for up to 3 months, requiring only four applications per growing season
• Works for both in-ground and container plants with simple application process
• Contains natural ingredients and vital micronutrients that promote stronger, more vibrant plants

Cons:

• Requires physical work to incorporate into soil, especially for in-ground applications
• Generic all-purpose formula may not address specific nutritional needs of certain plant varieties
• Must remember to reapply every 3 months to maintain consistent plant nutrition

Miracle-Gro Water Soluble Bloom Booster Flower Food (1360011)

When your impatiens need an extra boost to achieve their full flowering potential, Miracle-Gro Water Soluble Bloom Booster Flower Food stands out as a powerhouse solution with its remarkable 10-52-10 N-P-K ratio. The exceptionally high phosphorus content directly promotes enhanced bloom production and vibrant color development in your impatiens. You’ll appreciate the versatile application methods, whether using a garden feeder that covers 500 square feet or mixing one tablespoon per gallon for watering can application. This dual-action formula feeds through both roots and leaves, delivering instant nutrition every 7-14 days for consistent flowering results throughout the growing season.

Best For: Gardeners who want to maximize bloom production and color intensity in their flowering plants, particularly those growing impatiens, annuals, and perennials in both containers and garden beds.

Pros:

• High phosphorus formula (10-52-10) specifically designed to promote abundant blooms and vibrant flower colors
• Versatile application methods including garden feeder and watering can options with clear mixing instructions for both indoor and outdoor use
• Fast-acting dual nutrition system that feeds through both roots and leaves for quick, visible results within 7-14 days

Cons:

• Product specifications show inconsistent weight and size information (listed as both 0.5 pounds and 1.5 pounds)
• Regular application every 7-14 days required throughout growing season, making it more maintenance-intensive than slow-release fertilizers
• Specialized bloom booster may not provide balanced nutrition for overall plant health and foliage development

Osmocote Smart-Release Plant Food Plus Outdoor & Indoor, 1 lb.

Gardeners who struggle with frequent fertilizing schedules will find Osmocote Smart-Release Plant Food Plus Outdoor & Indoor perfectly suited for their impatiens care routine. This convenient formula delivers 11 essential nutrients through smart-release technology, feeding your plants consistently for up to six months with just one application. You’ll appreciate the no-burn pledge that protects your delicate impatiens when you follow the directions, giving you confidence whether you’re growing them in containers or garden beds. The versatile formula works equally well for indoor and outdoor impatiens, adapting to different growing conditions while providing the fortified nutrition your plants need for vibrant, sustained blooming throughout the season.

Best For: Gardeners who want a convenient, long-lasting fertilizer solution that works for both indoor and outdoor plants without the hassle of frequent reapplication.

Pros:

• Feeds plants for up to 6 months with just one application, reducing maintenance time
• Contains 11 essential nutrients with smart-release technology for consistent feeding
• Comes with a no-burn pledge when used as directed, making it safe for delicate plants

Cons:

• 1 lb package size may not be sufficient for large gardens or multiple plantings
• Smart-release technology means you have less control over nutrient timing compared to liquid fertilizers
• Higher upfront cost compared to basic fertilizers, though this is offset by the long feeding duration

Jobes 05231T Flowering Plant Fertilizer Spikes 10-10-4, 1 Pack, Multicolor

Simplicity becomes your greatest gardening ally with Jobes 05231T Flowering Plant Fertilizer Spikes, especially if you’re seeking hassle-free nutrition for your impatiens without the mess of liquid fertilizers. These pre-measured spikes deliver a balanced 10-10-4 NPK formula directly to your plant’s root zone, eliminating guesswork and preventing over-fertilization that can damage delicate impatiens. You’ll appreciate the slow-release design that feeds your plants consistently for 60 days, reducing maintenance while promoting vibrant blooms and healthy foliage growth. The nitrogen supports lush leaf development, while phosphorus encourages abundant flowering that makes impatiens truly spectacular in your garden beds or containers.

Best For: Gardening novices and busy plant owners who want a simple, mess-free way to provide consistent nutrition to their indoor flowering houseplants without the risk of over-fertilization.

Pros:

• Simple insertion application eliminates measuring and mixing while delivering pre-measured nutrients directly to plant roots for 60 days
• Slow-release formula reduces runoff, odors, and hazards compared to liquid fertilizers while preventing over-fertilization
• Users report improved plant health with brighter colors, more abundant blooms, and successful revitalization of struggling plants

Cons:

• Limited to 60-day feeding cycles requiring regular replacement every two months
• May not address specific nutritional needs of plants requiring customized fertilizer ratios
• Some users report finding similar products available at lower prices in local stores

Miracle-Gro Water Soluble Bloom Booster Flower Food, 5.5 lb

The Miracle-Gro Water Soluble Bloom Booster Flower Food stands out as an excellent choice for gardeners who want reliable, instant nutrition for their impatiens and other flowering plants. This versatile formula works effectively for both container and in-ground plantings, delivering essential nutrients that promote increased blooms and vibrant colors compared to unfed plants. You’ll appreciate the instant feeding action that enhances your impatiens’ growth and flowering capabilities throughout the growing season. Apply this water-soluble fertilizer every 7-14 days by mixing it with water in a watering can for indoor plants, or use a Miracle-Gro Garden Feeder for outdoor applications. The generous 5.5-pound container covers approximately 2,200 square feet, making it suitable for extensive flower gardens.

Best For: Gardeners with annual and perennial flowers, including roses, hydrangeas, hibiscus, and impatiens, who want to promote increased blooms and vibrant colors in both container and in-ground plantings.

Pros:

• Provides instant feeding action that enhances plant growth and flowering capabilities throughout the growing season
• Versatile application methods allow for easy use with watering cans indoors or garden feeders outdoors
• Large 5.5-pound container covers approximately 2,200 square feet, making it cost-effective for extensive flower gardens

Cons:

• Requires frequent application every 7-14 days, which may be time-consuming for busy gardeners
• Garden feeder for outdoor use is sold separately, adding to the overall cost
• Water-soluble formula means nutrients may wash away quickly with heavy rain or overwatering

10-10-10 All Purpose Plant Food – Liquid Fertilizer (1x8oz)

Balanced nutrition becomes essential when you’re seeking one fertilizer that’ll work across your entire garden, from delicate impatiens to robust vegetables. This 10-10-10 liquid fertilizer delivers equal parts nitrogen, phosphorus, and potassium, creating the perfect foundation for healthy plant development. The nitrogen promotes lush foliage growth, while phosphorus strengthens root systems, and potassium enhances overall plant vigor and disease resistance.

What sets this formula apart is its seaweed extract enrichment, which provides important micronutrients and natural growth hormones that standard fertilizers often lack. The added 6% chelated iron prevents yellowing leaves across various soil conditions, ensuring your impatiens maintain vibrant green foliage.

Best For: Gardeners seeking a versatile, all-purpose liquid fertilizer that works effectively for both indoor houseplants and outdoor gardens, including vegetables, flowers, and lawns.

Pros:

• Balanced 10-10-10 NPK formula with seaweed extract and 6% chelated iron provides comprehensive nutrition in one product
• Easy to use liquid format that mixes with water, suitable for beginners and experienced gardeners
• Effective across various plant types and soil conditions, with users reporting significant improvements in plant health and yields

Cons:

• 8oz bottle size may require frequent repurchasing for larger gardens or regular feeding schedules
• Some customers experienced initial packaging issues, though these were resolved by the seller
• Limited to liquid application method, which may not suit all gardening preferences or irrigation systems

Organic Plant Magic Fast-Acting Water Soluble Plant Food (1/2 lb Bag)

Organic gardeners seeking an extensive, all-natural solution for their impatiens will find Organic Plant Magic Fast-Acting Water Soluble Plant Food delivers exceptional results through its unique blend of essential nutrients and beneficial microorganisms. This concentrate contains 55+ trace minerals, amino acids, humic acids, kelp, and GroBiotics including mycorrhizae, creating nutrient-rich soil that supports continuous feeding. You’ll appreciate its versatility—simply add directly to soil, transplant roots, or mix with regular watering for easy application. The half-pound bag treats up to 1,000 square feet or creates 32+ gallons of fertilizer solution, making it economical for extensive impatiens displays. Expect vibrant blooms with enhanced color intensity.

Best For: Organic gardeners who want a versatile, all-natural fertilizer that works effectively on flowers, vegetables, herbs, fruit trees, and indoor houseplants while promoting healthy soil with beneficial microorganisms.

Pros:

• Contains 55+ trace minerals, amino acids, humic acids, kelp, and beneficial GroBiotics including mycorrhizae for comprehensive plant nutrition
• Highly versatile application methods – can be added directly to soil, transplant roots, or mixed with regular watering
• Economical coverage with one half-pound bag treating up to 1,000 square feet or making 32+ gallons of fertilizer solution

Cons:

• Notable compost-like smell when mixing that some users may find unpleasant
• Can be messy if spilled and requires cleanup
• Label lacks clear organic certification information, requiring users to search for verification

Factors to Consider When Choosing Impatiens Fertilizer

When I’m selecting fertilizer for my impatiens, I consider several key factors that directly impact bloom quality, plant health, and garden success. The NPK ratio becomes vital since impatiens need balanced nutrition, while deciding between slow-release granules and fast-acting liquids affects my feeding schedule and maintenance routine. I also weigh organic versus synthetic options alongside application methods, whether I’m growing in containers or garden beds, since each choice influences nutrient delivery and plant performance.

NPK Ratio Requirements

Understanding the nitrogen-phosphorus-potassium (NPK) ratio becomes essential for achieving those spectacular impatiens blooms you’re hoping to cultivate in your garden. I recommend starting with a balanced 10-10-10 fertilizer, which provides equal parts of each nutrient for overall plant health and consistent growth. During your impatiens’ initial growth stages, you’ll want to take into account a slightly higher nitrogen ratio like 12-10-10, which supports robust foliage development and strong root establishment. When blooming time arrives, I suggest switching to a high-phosphorus formula such as 10-52-10, which enhances flower production and intensifies color vibrancy. Remember that low potassium ratios can weaken stems and reduce flower quality, so maintaining balanced nutrition throughout the growing season guarantees your impatiens will thrive beautifully.

Slow Vs Fast Release

Since your impatiens demand consistent nutrition throughout their growing season, choosing between slow-release and fast-release fertilizers becomes an essential decision that’ll directly impact your garden’s success. I recommend slow-release fertilizers for most gardeners because they provide nutrients gradually over 3-6 months, eliminating frequent applications while preventing nutrient burn. These fertilizers create a buffer against overfeeding, which protects your impatiens from damage caused by excessive nutrients. However, fast-release options deliver nutrients within one to two weeks, promoting rapid blooming when you need quick results. You’ll need to apply fast-release fertilizers every 1-2 weeks, requiring more attention but offering immediate gratification. For impatiens thriving in moist, nutrient-rich environments, slow-release fertilizers typically provide the consistent feeding these vigorous bloomers require.

Liquid Vs Granular Forms

How do you decide between liquid and granular fertilizers for your impatiens when both offer distinct advantages for different gardening situations? I find that liquid fertilizers deliver nutrients directly to your plants, creating faster absorption and quicker visible results in growth and blooming. You’ll need to mix these with water before application, but they’re instantly available to your impatiens regardless of soil conditions. Granular fertilizers, on the other hand, provide sustained feeding for up to three months, reducing your maintenance workload considerably. They spread directly onto soil without mixing, though they depend on adequate moisture to activate properly. Consider your N-P-K ratio preferences, application convenience, and whether you prioritize immediate results or long-term, consistent nutrition for your impatiens.

Organic Vs Synthetic Options

Beyond choosing between liquid and granular forms, you’ll face another important decision about whether to use organic or synthetic fertilizers for your impatiens. Organic options, containing compost, bone meal, or seaweed, improve soil health by enhancing microbial activity and nutrient availability over time. However, their lower nutrient composition requires more frequent applications compared to synthetic alternatives. Synthetic fertilizers deliver quick-release nutrients with specific NPK ratios, promoting rapid growth and abundant flowering in your impatiens. While they’re highly effective for immediate results, synthetic options can cause nutrient leaching and soil degradation if overused. Organic fertilizers support environmentally sustainable practices, minimizing chemical runoff while enhancing soil biodiversity. I recommend considering your gardening goals, environmental priorities, and maintenance preferences when choosing between these options.

Container Vs Ground Application

When choosing fertilizers for your impatiens, the planting location considerably influences your fertilization strategy, nutrient requirements, and application methods. Container plantings require more frequent feeding, typically every 1-2 weeks, since nutrients deplete faster in confined soil environments. I recommend using balanced 10-10-10 NPK fertilizers for potted impatiens, ensuring adequate foliage and root development through consistent nutrition. Liquid fertilizers work exceptionally well for containers, mixing easily with water for immediate nutrient absorption.

Ground plantings benefit from slow-release granular fertilizers that provide extended nutrition, reducing application frequency while minimizing nutrient leaching. These fertilizers should be mixed into the soil for effective uptake. Container growing mediums often lack essential micronutrients, so I always choose fertilizers containing trace minerals to support overall plant health and vibrant flowering.

Feeding Frequency Needs

Understanding your impatiens’ feeding frequency needs guarantees you’ll maintain those spectacular blooms throughout the entire growing season. I recommend fertilizing every 1-2 weeks during active growth periods, which provides consistent nutrient availability for vibrant flowers and healthy foliage development. When you’re starting with a new fertilizer regimen, begin with half-strength applications to observe how your plants respond before increasing to full concentration. This cautious approach prevents leaf burning and other negative effects from over-fertilization. Water-soluble fertilizers work exceptionally well for frequent feeding schedules because they deliver instant nutrition that impatiens can immediately absorb and utilize. Always follow manufacturer application rates carefully, adjusting frequency based on your plants’ visual cues, growth patterns, and seasonal changes in their nutritional requirements.

Soil Ph Compatibility

Soil pH compatibility plays a fundamental role in fertilizer selection, as impatiens perform best when growing in slightly acidic to neutral conditions between 6.0 and 7.0. I recommend conducting a soil test before choosing your fertilizer, since pH levels directly affect nutrient availability for your plants. When soil becomes too alkaline, your impatiens can’t absorb essential iron and manganese, leading to yellowing leaves and poor growth.

I suggest selecting fertilizers that include organic matter, which naturally buffers pH fluctuations while improving overall soil health. If your soil test reveals high pH levels, you’ll need to incorporate amendments like sulfur or peat moss alongside your fertilizer application. This approach guarantees your chosen fertilizer works effectively within the ideal pH range, promoting vibrant blooms and healthy plant development throughout the growing season.

On a final note

I’ve provided you with eight excellent fertilizer options that’ll help your impatiens produce vibrant, abundant blooms throughout the growing season. Whether you choose water-soluble formulas for quick nutrient delivery, slow-release granules for consistent feeding, or organic options for gentle nourishment, you’re well-equipped to make an informed decision. Remember to evaluate your garden’s specific needs, soil conditions, and your preferred application method when selecting the perfect fertilizer for your impatiens.