Best Slow Release Garden Fertilizers in 2026

OSMOCOTE’S HIGHEST TOTAL NUTRIENT FORMULA: NPK = 14-14-14. Favored for seasonal vegetables and perennials. Promotes strong roots as well as vigorous and bountiful above-ground growth.

OSMOCOTE’S DIRECTIONS FOR USE: 1 lb. covers 40 sq. ft. (approx. 6½’ x 6½’). Mix into 1 – 3” of soil. Applicator included. Apply to vegetable gardens and mulched areas around ornamental trees / shrubs, and raised beds.

OSMOCOTE QUALITY: Osmocote is the original slow-release plant food. Decades of rigorous field testing confirm product effectiveness with hundreds of plant species in a variety of climate and soil conditions.

Product 1: Proven Winners water Soluble fertilizer comes in an easy-to-use 2.5 lb.

Product 1: 24-12-17 fertilizer blend

Product 1: Following the application rates on the container, apply at least every week, or every third watering

Jobe's Houseplant Fertilizer Spikes 13-4-5 Fertilizer spikes feed trees at the roots, where they need it most

Slow release, Pre-measured fertilizer spikes nourishes at the roots; Time release fertilizer for all houseplants

Indoor Use, Easy to use fertilizer spikes; No wasteful runoff, no mess, hazards or smells

LIGHT APPLICATIONS - A balanced mix of essential nutrients with low NPK rates to gently feed your live cacti and succulents. Aids and enhances root development, color vibrancy, beautiful bloom, and stem growth in both plant types.

LASTS LONGER, FOR LESS - Easy, ready to use granular formula feeds your plants consistently for 9 months! Simply poke holes or sprinkle around your pot mix, water, and watch your succulent/cactus thrive! Perfect for pots with pumice, pebbles, gravel, perlite, and other organic potting soil mixes.

LIQUID ALTERNATIVE - Excellent alternative to liquid fertilizer in a spray bottle. Great for houseplants that need consistent nutrition year round but less watering.

LOW MAINTENANCE: Our vine fertilizer is perfect for all homeowners! This slow release fertilizer only requires feeding every 14 days till blooming begins. Once blooming begins, you only need to feed your plants once a month.

PACKED WITH NUTRIENTS: Our well developed bougainvillea plant food has a 17-7-10 formula promotes the development of healthy colorful blooms, while maintaining the health of your plants. With 4 sources of nitrogen and nutrients for maintaining plant health, this fertilizer allows for extended periods between feedings. This fertilizer works with soil biology to provide your vines with the best fertilizer and nutrition possible, at the right time.

MAINTAIN YOUR PLANT'S HEALTH: Feel the benefits of a formula that was created to maintain your plants health. With added sulfur and gypsum, our formula helps create acidic soil to improve overall soil structure around the roots.

Product 1: Pre-measured fertilizer spikes nourishes at the roots; time release fertilizer for all trees and shrubs

Product 1: Easy to use fertilizer spikes; no wasteful runoff, no mess, hazards or smells; apply early spring and late fall

Product 1: Continuous supply of nutrients below the surface, where the active roots are growing

Product 1: Pre-measured fertilizer spikes nourishes at the roots; Time release fertilizer for all trees and shrubs

Product 1: Easy to use fertilizer spikes; No wasteful runoff, no mess, hazards or smells; Apply early spring and late fall

Product 1: Continuous supply of nutrients below the surface, where the active roots are growing

The information below is per-pack only

Excellent for evergreens, dogwoods, hydrangeas, magnolias and many other acid-loving trees and shrubs

Encourages vigorous root growth and lush foliage

Eco-friendly

Slow Release, feeds up to 3 months

Aids in root development

Phosphorus-free fertilizer blend with fine particle size that includes humic acid, which helps increase turf quality and reduce nutrient requirements

Contains MUtech coated slow release nitrogen to provide uniform growth and extended feeding

DG particles do not rely on a physical coating to release nutrients. Coated fertilizers (used by our competitors) are very susceptible to damage from mowers, resulting in premature nutrient release.

Organic fertilizer spikes for container grown trees; pre-measured spikes provide nourishment at the roots

OMRI listed for organic gardening;

Contains Jobe's Biozome with the proprietary microorganism Archaea that aggressively breaks down nutrients for faster results

🌱 PERFECT BLEND OF NUTRIENTS - Give your bonsai trees everything they need to grow up healthy! Our 18-6-8 slow release fertilizer pellets have all of the essential nutrients that your plants crave.

🌱 6 MONTH TIMED RELEASE - A single application of our bonsai plant fertilizer lasts up to 180 days, thanks to its controlled release. This significantly minimizes waste and the need for upkeep.

🌱 SUITABLE FOR ALL VARIETIES - You can use our bonsai tree fertilizer pellets on just about any kind of bonsai tree, from Spruce to Cedar. It's also great for seedlings and mature plants alike.

ESSENTIAL NUTRIENTS - A balanced mix to feed your ficus that promotes strong root structure, growth and overall better health. Provides the proper nutrients to grow your small fiddleleaf or audrey ficus into a giant!

FOR GREEN GLOSSY LEAVES - Effective for all ficus varieties, indoors and outdoors, this easy to use formula promotes leaves that gloss and shine. Delivers the essential nutrients your plants crave that's lacking from standard organic soil mixes in pots and planters.

GENTLE, STEADY FEEDING - A great alternative to liquid fertilizers that can cause overwatering, our fertilizer pellets added to your plant pot gradually feed with every watering, protecting your delicate houseplant from fertilizer burns and too much water.

Organic results in less than 1 week

OMRI, CDFA and WSDA listed for organic gardening; No synthetic chemicals EVER

3-3-2 NPK General Purpose liquid organic fertilizer; Formulated for lawns, vegetables, greenhouses, herbs and everything else that grows; Derived from organic fish and grain

GROW WITH CONFIDENCE - Fully balanced fertilizer package with essential macro and micro nutrients that gently feeds and encourages strong root, trunk, and branch growth for sustainable long term plant health.

SLOW RELEASE GOODNESS - Long lasting granular formula to gradually nourish your bonsai plant 9 months at a time! Best alternative to liquid feeding, each bag contains over 35 applications for standard 6" training pots, over 20 applications for a 10" decorative pot.

STRESS FREE - Bonsai care made easy. No need to heavily mix our granular fertilizer into your potting soil. Just carefully place pellets around the base of your tree and watch it thrive with every watering! Great for pots with gravel, moss, pebbles, pumice, lava rocks and other organic soil mixes.

Perfect planting medium for indoor houseplants

Contains slow release fertilizer for balanced plant growth

Better plant growth due to the planting medium regulating the moisture content, acidity & nutrients

THE IDEAL FERTILIZER SPIKE for Trees and Shrubs including all types of deciduous trees/shrubs, Hydrangeas, Honeysuckle, Dogwood, Hibiscus, and more

SLOW RELEASE: Jobe's fertilizer spikes are slow release, meaning that they release a small steady amount of nutrients to your plants over time to keep your plants happy and healthy all season long

EASY-TO-USE: Whether you're a seasoned gardening pro or just starting your gardening journey, Jobe’s spikes are easy to insert around each plant’s dripline

🕣 SLOW-RELEASE PELLETS, 5oz — Easy, Nutrient-rich Plant Food that lasts 6 FULL MONTHS

✅ EASY TO USE — One Application Releases Consistent Nutrients over 6 Months

💚 13-11-11 RATE — for Vibrant, High Quality Phalaenopsis — Increase Bloom Size & Color Saturation

Down to Earth Vegan Mix is a five pound box of all natural fertilizer with 3-2-2 formula and is listed by the Organic Materials Review Institute (OMRI) for use in organic production

Contains essential nutrients derived from plant materials and natural minerals plus humic acids, with no animal products or by-products and is free of preservatives

Slow-release formula designed to continually nourish your vegetables, herbs and flowers, just mix into the soil at planting or top dress throughout the growing season

Pre-measured palm tree fertilizer spikes nourishes at the roots; Apply twice per year between March and October

Easy to use fertilizer spikes; No wasteful runoff, no mess, hazards or smells

Continuous supply of nutrients below the surface, where the active roots are growing

12-6-6

Slow release

Size: 3.5 lbs

Pro-grade, professional DIY results

1 Application = 3 lawn treatments; blocks crabgrass, kills weeds, feeds lawn

Kills 200+ tough lawn weeds; proprietary formula kills dandelions and seedling crabgrass at the same time

Perfect planting medium for indoor houseplants

Contains slow release fertilizer for balanced plant growth

Better plant growth due to the planting medium regulating the moisture content, acidity & nutrients

PLANT FERTILIZER: Promotes strong roots and enriches the soil

PLANT FOOD: Long lasting, slow-release feeding lasts up to 4 months

SPECIAL FORMULA: Special blend is formulated with Micro-nutrients for beautiful blooms

PREMIUM INDOOR ORGANIC CACTUS & SUCCULENT FERTILIZER — Stimulates robust root growth, stem development & color vibrancy for all live Cacti, Succulents, Aloe Vera, Jade & other arid / desert plants

NO MESSY LIQUIDS / NO CONFUSING MEASURING SPOONS / NO STINKY SMELL — 1 tube = 100 concentrated EarthPods (a 6-year supply for a single special plant or use on big collection of Succulent & Cactus species)

FAST & EASY TO APPLY — Push 1 EarthPod into potting soil mix near center of plant OR open capsule & spread contents if grown in bark / pebble substrate, then just water! (EarthPods break down & slow release nutrients direct to root zone)

SLOW RELEASE - Special blend fertilizes immediately and throughout a 2-3 month period.

FREE MEASURING SCOOP - Includes instructions on label by pot size.

12-4-5 High Nitrogen NPK For Fast Growth - Nitrogen (N) – for the growth of leaves on the plant. Phosphorus (P) – for root growth, flower and fruit development. Potassium (K) for overall plant health.

🌱【Grow Bigger & Healthier Plants!】Get the growth your plants deserve! Plantonix Neem Bliss Premium Neem Seed Meal helps improve soil texture, soil aeration, and water retention, which helps your plants grow healthy roots! Plantonix Neem Bliss 6-1-2 is composed of 6.0% Water Insoluble Nitrogen, 1.0% Phosphate, and 2.0% Soluble Potash.

💐【Protect Your Plants and Garden!】Neem Bliss is derived from cold pressed neem tree seeds (Azadiracta indica). After being extracted, the remaining material can be processed and turned into a soil amendment that protects plants against diseases, while also improving soil nutrients!

✅【OMRI Listed for Organic Fertilizer Use!】Plantonix Neem Bliss has been listed by OMRI (Organic Materials Review Institute) for use in organic production and complies with USDA standards. Neem Bliss restores and enhances overall soil health naturally, while also being a great source of slow release nitrogen.

Not Available for Sell in WA, USA

1.5 kg: Specially formulated for use on Magnolia trees.

Promotes long-term vitality through robust root development.

THE IDEAL FERTILIZER SPIKE for all types of Fruit and Citrus trees including Apple, Orange, Lemon, Grapefruit, Mango, and more

SLOW RELEASE: Jobe's fertilizer spikes are slow release, meaning that they release a small steady amount of nutrients to your plants over time to keep your plants happy and healthy all season long

EASY-TO-USE: Whether you're a seasoned gardening pro or just starting your gardening journey, Jobe’s spikes are easy to insert around each plant’s dripline

ULTIMATE LIQUID NITROGEN FERTILIZER: This liquid lawn food supplement has an ultra-high nitrogen formula to promote green grass and quick growth. Easily turn yellow & nitrogen deficient grass into a lush thick green!

28-0-0 QUICK & SLOW RELEASE TECHNOLOGY: This 2-in-1 liquid lawn fertilizer formula provides 70% quick-release nitrogen for rapid green and growth and 30% slow-release nitrogen for ongoing growth between applications.Get the best of both worlds in 1 easy application.

WORKS WITH ALL GRASS TYPES: Whether you have warm- or cold-season grass, this is the perfect liquid grass food for quick green-up. It's super-effective in making your lawn green and to achieve consistent growth. Ideal for both new and old lawns.