Jack's Classic ClassiCote with CrystalGreen 15-8-23 Time-Release Fertilizer | 6lb Shaker Jar - (Case of 4)

Time-Release 15-8-23 Fertilizer with Crystal Green, 6lb Shaker Jar

Reapplying fertilizer every week or two isn't always practical across a large planting. Jack's ClassiCote with Crystal Green 15-8-23 releases nutrients gradually for up to 4 months of vigorous growth from a single application, blended with an enhanced micronutrient package for strong roots and green foliage.

6lb shaker jar, sold in a case of 4, 4-month time-release formula.

Key Features & Benefits

• 15-8-23 time-release formula — releases nutrients gradually for up to 4 months of vigorous growth.
• Crystal Green recovered-phosphorus technology — a renewable, slowly available source of phosphorus and magnesium recovered from wastewater treatment rather than mined.
• Enhanced micronutrient package — iron, manganese, molybdenum, magnesium, and sulfur for strong roots and green foliage.
• Highest safety factor to prevent burning — when applied as directed, reduces the risk of over-fertilization damage.

Who Should Use Jack's ClassiCote

This fits growers who want a long-window, single-application feeding program rather than a weekly or biweekly water-soluble routine, across indoor and outdoor plantings.

About Crystal Green Technology

Crystal Green is a recovered-nutrient technology from Ostara that captures phosphorus and magnesium from wastewater treatment into a highly pure crystalline compound, giving ClassiCote a renewable, slowly available nutrient source alongside its traditional time-release coating.

Frequently Asked Questions

How long does one application of this fertilizer last?

It releases nutrients gradually for up to 4 months of vigorous growth from a single application, so growers don't need to reapply on a short weekly or biweekly cycle. That extended window is built into the coating technology rather than requiring precise repeat dosing.

What is Crystal Green technology?

Crystal Green is a recovered-nutrient technology that captures phosphorus and magnesium from wastewater treatment into a highly pure crystalline compound, providing a renewable, slowly available nutrient source. It's blended into this ClassiCote formula alongside traditional time-release coating to extend the feeding window.

Is this fertilizer likely to burn plants if I apply too much?

JR Peters states it features the highest safety factor to prevent burning when applied as directed, which gives some margin for error compared to fast-release fertilizers. Following the labeled application rate is still the best way to avoid over-fertilization regardless of a product's built-in safety margin.

What size and packaging is this listing?

This is the 6lb shaker jar option, sold in a case of 4. All ClassiCote sizes share the same 15-8-23 formula and Crystal Green technology, so the choice comes down to how much product a grower needs on hand.