Quality ingredients and consistent release ensure superior performance, season after season
Osmocote controlled release fertilizer packs an abundance of technology inside a resin coated NPK nutrient core that reliably delivers vital nutrition throughout the growth cycle of the plant. Since 1966, it has been continuously trialed, refined, and improved as new research and technologies became available. Today, it’s the most scientifically advanced and widely used controlled release fertilizer in the world, with a diverse product range known and trusted by professional growers worldwide.
How it works
After irrigation, water penetrates the semi-permeable coating and starts to dissolve the nutrients. Once partially dissolved the release begins, regulated by ambient temperature and self-synchronizing to the plant’s growth cycle. Exactly the right amount of nutrients are released—at exactly the right time.
Benefits of controlled release fertilizer
- Controlled nutrient delivery promotes compact, uniform growth and rich color
- Fewer fertilizer applications are needed, resulting in lower labor costs
- Higher efficiency due to reduced nutrient loss
- Specialized formulations for every application
- Minimized environmental impact due to reduced volatilization, denitrification and leaching
Healthy growth means healthy profit
The costs associated with a fertilization program are a major consideration every grower is faced with. Over the course of a season, Osmocote will cut labor expenses while producing a superior product that demands a higher price at the point of sale. The guesswork is eliminated, and you gain the peace of mind that comes from using the most proven controlled release products available.
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51 Products found

Osmocote 13-13-13 is ideal for use in nursery, foliage and greenhouse production, container gardens, interiorscapes and landscapes.

Ideal for use in nursery, foliage and greenhouse production, container gardens, interiorscapes and landscapes. It is commonly added to heavy feeding greenhouse plants or used when multiple crops are grown together.

Osmocote 18-6-12 Lo-Start provides a nutrient boost at the end third of the growing cycle. Ideal for use in nursery, foliage and greenhouse production, container gardens, interiorscapes and landscapes.

Osmocote 19-6-10 Mini-prill has a smaller prill size (1/6 the size of regular Osmocote) that provides uniform distribution in smaller containers (4 inches and below).

Osmocote 19-6-12 is ideal for use in nursery, foliage and greenhouse production, container gardens, interiorscapes and landscapes.

Osmocote 19-6-12 Lo-Start provides a starter boost of nutrition at the beginning of the growing cycle. Ideal for use in nursery, foliage and greenhouse production, container gardens, interiorscapes and landscapes.

Osmocote 19-6-12 is ideal for use in nursery, foliage and greenhouse production, container gardens, interiorscapes and landscapes.

Osmocote 19-6-12 is ideal for use in nursery, foliage and greenhouse production, container gardens, interiorscapes and landscapes.

Osmocote Blend 12-6-6 Topdress with E-Max polymer coating regulates the release of nutrition based upon moisture and temperature, improving nutrient efficiency and offering predictable longevities. Ideally suited for outdoor production, it provides fast green-up for overwintered plants.

Osmocote Blend 12-6-8 Topdress with E-Max polymer coating regulates the release of nutrition based upon moisture and temperature, improving nutrient efficiency and offering predictable longevities. Ideally suited for outdoor production, it provides fast green-up for overwintered plants.

The Poly-S technology in Osmocote Blend 17-3-6 Topdress ensures that nutrients are delivered at a constant rate regardless of climate or temperature swings.

Osmocote Blend 17-5-11 contains resin-coated NPK cores pre-blended with Micromax® micronutrients. Can be used in conjunction with water-soluble fertilizers or alone, as an all-in-one nutritional program.

Osmocote Blend 17-5-11 contains resin-coated NPK cores pre-blended with Micromax® micronutrients. Can be used in conjunction with water-soluble fertilizers or alone, as an all-in-one nutritional program.

Osmocote Blend 17-5-11 contains resin-coated NPK cores pre-blended with Micromax® micronutrients. Can be used in conjunction with water-soluble fertilizers or alone, as an all-in-one nutritional program.

Osmocote Plus 17-5-11 contains resin-coated NPK cores pre-blended with Micromax® micronutrients. Can be used in conjunction with water-soluble fertilizers or alone, as an all-in-one nutritional program.

The Poly-S technology in Osmocote Blend 18-3-12 Quickstart ensures that nutrients are delivered at a constant rate regardless of climate or temperature swings.

Osmocote Blend 18-5-12 Quickstart is a mix of coated and uncoated NPK resin cores that provide a heavy supply of nutrition early in the growth cycle. Pre-blended with STEP Hi-Mag micronutrients to ensure strong growth and healthy plants.

Osmocote Blend 18-5-12 Quickstart is a mix of coated and uncoated NPK resin cores that provide a heavy supply of nutrition early in the growth cycle. Pre-blended with STEP Hi-Mag micronutrients to ensure strong growth and healthy plants.

Osmocote Blend 18-5-8 contains elevated nitrogen levels which lower costs by reducing application rates. Can be used in conjunction with water-soluble fertilizers or alone, as an all-in-one nutritional program.

Osmocote Blend 18-5-8 contains elevated nitrogen levels which lower costs by reducing application rates. Can be used in conjunction with water-soluble fertilizers or alone, as an all-in-one nutritional program.

Osmocote Blend 18-5-8 contains elevated nitrogen levels which lower costs by reducing application rates. Can be used in conjunction with water-soluble fertilizers or alone, as an all-in-one nutritional program.

Osmocote Blend 18-5-8 contains elevated nitrogen levels which lower costs by reducing application rates. Can be used in conjunction with water-soluble fertilizers or alone, as an all-in-one nutritional program.

The Poly-S technology in Osmocote Blend 19-5-8 ensures that nutrients are delivered at a constant rate regardless of climate or temperature swings.

The Poly-S technology in Osmocote Blend 19-5-9 ensures that nutrients are delivered at a constant rate regardless of climate or temperature swings.

The advanced Fusion technology in Osmocote Blend 19-6-9 binds the nutrient cores to the growing media, keeping them in place if the pot is tipped.

The advanced Fusion technology in Osmocote Blend 20-4-7 binds the nutrient cores to the growing media, keeping them in place if the pot is tipped.

Osmocote Blend 20-4-8 is resin-coated NPK blended with Poly-S and IBDU water-activated urea, nitrogen granules, and STEP Hi-Mag micronutrients. Provides early-season nutrition to areas with mild spring temperatures.

Osmocote Blend 20-5-5 is resin-coated NPK blended with Poly-S and IBDU water-activated urea, nitrogen granules, and STEP Hi-Mag micronutrients. Provides early-season nutrition to areas with mild spring temperatures.

Osmocote Blend 21-3-7 Topdress with E-Max polymer coating regulates the release of nutrition based upon moisture and temperature, improving nutrient efficiency and offering predictable longevities. Ideally suited for outdoor production, it provides fast green-up for overwintered plants.

The Poly-S technology in Osmocote Blend 21-4-8 ensures that nutrients are delivered at a constant rate regardless of climate or temperature swings.

The Poly-S technology in Osmocote Blend 19-5-9 ensures that nutrients are delivered at a constant rate regardless of climate or temperature swings.

The Poly-S technology in Osmocote Blend 22-3-8 ensures that nutrients are delivered at a constant rate regardless of climate or temperature swings.

Osmocote Blend 22-5-6 is Poly-S and IBDU water-activated urea combined with STEP Hi-Mag micronutrients. Provides early-season nutrition to areas with mild spring temperatures.

Osmocote Blend 23-4-8 with E-Max polymer coating regulates the release of nutrition based upon moisture and temperature, improving nutrient efficiency and offering predictable longevities.

Osmocote Blend 23-4-8 with E-Max polymer coating regulates the release of nutrition based upon moisture and temperature, improving nutrient efficiency and offering predictable longevities.

Osmocote Blend 23-4-8 with E-Max polymer coating regulates the release of nutrition based upon moisture and temperature, improving nutrient efficiency and offering predictable longevities.

The Poly-S technology in Osmocote Blend 24-4-9 ensures that nutrients are delivered at a constant rate regardless of climate or temperature swings.

Osmocote Blend 27-4-8 with E-Max polymer coating regulates the release of nutrition based upon moisture and temperature, improving nutrient efficiency and offering predictable longevities.

Osmocote Blend 27-4-8 with E-Max polymer coating regulates the release of nutrition based upon moisture and temperature, improving nutrient efficiency and offering predictable longevities.

Osmocote Blend 27-4-8 with E-Max polymer coating regulates the release of nutrition based upon moisture and temperature, improving nutrient efficiency and offering predictable longevities.

Specially formulated for plants with a fast (6-12 week) production time.

Polymer-coated E-Max Release Technology safely delivers aluminum sulfate and essential micronutrients to produce brilliant blue hydrangeas.

Recommended when growing a wide variety of plants. Can be used alone or in combination with water-soluble fertilizer for a steady source of nutrition throughout the season.

Osmocote Plus 15-9-11 Lo-Start delivers an extra boost of nutrition in the second half of the growth cycle—recommended for long-term propagation, fall plantings and overwintering.

Osmocote Plus 15-9-12 is recommended when growing a wide variety of plants. Standard release pattern delivers a steady stream of nutrition throughout the growth cycle.

Osmocote Plus 15-9-12 Hi-Start provides an extra boost of nutrition at the start of the growth cycle. Ideal for use on fast growing spring crops and early season bloomers.

Osmocote Plus 15-9-12 is recommended when growing a wide variety of plants.

Osmocote Plus 15-9-12 is recommended when growing a wide variety of plants. Standard release pattern delivers a steady stream of nutrition throughout the growth cycle.

Osmocote Plus 15-9-12 is recommended when growing a wide variety of plants. Standard release pattern delivers a steady stream of nutrition throughout the growth cycle.

Osmocote Plus 15-9-12 Hi-Start provides an extra boost of nutrition at the start of the growth cycle. Ideal for use on fast growing spring crops and early season bloomers.

Osmocote Plus 15-9-12 Lo-Start delivers an extra boost of nutrition in the second half of the growth cycle—recommended for long-term propagation, fall plantings and overwintering.
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