What makes Nature Safe 21-3-7 UFLEXX® a slow release lawn fertilizer?

Nature Safe 21-3-7 UFLEXX® uses UFLEXX® stabilized nitrogen technology to slow the release of nitrogen into the soil. Instead of delivering nutrients all at once, the fertilizer provides a steady feeding period that can last up to 6 to 8 weeks. This helps maintain consistent turf growth and color over time. It can also reduce the number of fertilizer applications needed during the growing season.

When should I apply UFLEXX fertilizer in Colorado?

UFLEXX fertilizer amendments can be applied during active turf growth periods in spring, summer, and fall. Many Colorado lawn care programs focus on spring green-up and fall root development. Because the product feeds for several weeks, it fits well into seasonal maintenance schedules. Always follow label directions and adjust timing based on your grass type and local conditions.

How much Nature Safe fertilizer should I apply?

The recommended application rate is 5 pounds per 1,000 square feet. At that rate, the product delivers 1 pound of actual nitrogen per 1,000 square feet. Proper calibration of your spreader helps achieve even coverage. Following label recommendations helps prevent overapplication.

Can Nature Safe 21-3-7 UFLEXX® be used on sports turf?

Yes. Nature Safe 21-3-7 UFLEXX® is commonly used on sports turf, commercial landscapes, and residential lawns. The slow-release nitrogen source helps support consistent turf performance under regular use. Its professional-grade formulation makes it suitable for a wide range of turf management programs. Always follow site-specific fertility recommendations.

Is Nature Safe 21-3-7 UFLEXX® approved for organic food production?

No. Although the fertilizer contains recycled animal-based ingredients, it is not intended for use in organic crop production or organic food production. It is formulated for turf and landscape applications. Always review the product label and SDS before use. Source information provided in the product specifications.

Nature Safe 21-3-7 UFLEXX® Coarse Grade Fertilizer

Close-up view of teal and brown fertilizer granules.

Nature Safe 21-3-7 UFLEXX®

$3,372.00 USD

Size

Quantity

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Nature Safe leverages a premium formula for this fertilizer to ensure proper nutrients and growth for your lawn care or sports turf needs. Consisting of urea, meat and bone meal, sulfate of potash and blood meal, the 18.2% urea nitrogen of UFLEXX® is stabilized and will release for up to 7 to 8 weeks. Not for use in organic crops and organic food production.

General information

Nature Safe 21-3-7 Blended with UFLEXX® is safely derived from recycled animal sources and blended with UFLEXX® for a stabilized nitrogen release. Not intended for use in organic crop and food production. Consult the product label and Safety Data Sheet (SDS) before use. Do not eat, feed to animals or apply to land used for grazing ruminant animals. Always wash hands thoroughly with soap and water after handling. For more information on particle size and customized formulations, please contact a Nature Safe sales representative.

Timing

Provides initial results in 7 to 10 days and continues to release nitrogen for 6 to 8 weeks after application.

Directions for Application

Apply 5 lbs. per 1,000 sq. ft. 1.0 lb. of actual Nitrogen per 1,000 sq. ft. Results are enhanced if used during aeration.

Details

Brand: Nature Safe

Weight: 50 lb

SKU: 10396

FAQs

Nature Safe 21-3-7 UFLEXX® uses UFLEXX® stabilized nitrogen technology to slow the release of nitrogen into the soil. Instead of delivering nutrients all at once, the fertilizer provides a steady feeding period that can last up to 6 to 8 weeks. This helps maintain consistent turf growth and color over time. It can also reduce the number of fertilizer applications needed during the growing season.

UFLEXX fertilizer amendments can be applied during active turf growth periods in spring, summer, and fall. Many Colorado lawn care programs focus on spring green-up and fall root development. Because the product feeds for several weeks, it fits well into seasonal maintenance schedules. Always follow label directions and adjust timing based on your grass type and local conditions.

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Nature Safe 21-3-7 UFLEXX®

General information

Timing

Directions for Application