Jack's ClassiCote avec Crystal Green à libération prolongée - 4 lb

Ammoniacal Nitrogen (N) is a plant-available form of ammonium (NH₄⁺) that provides a steady, gentle source of nitrogen for healthy green growth. Unlike fast-release nitrogen types, ammoniacal nitrogen feeds plants slowly, helps stabilize root-zone pH, and works well in cooler temperatures. It is commonly used during early vegetative growth because it supports strong leaf development without burning young roots. If plants show pale leaves, slow growth, or weak stems, they may need more available ammoniacal nitrogen.

Available Phosphate (P₂O₅) supports root development, energy transfer, and early structural growth by providing a form of phosphorus that plants can absorb and use quickly.

Ferrous sulfate supplies iron in a fast-acting, reactive form that helps plants make chlorophyll properly, so new leaves can return to a deeper green when the yellowing is truly iron-related. It’s unique because it can work quickly but is highly dependent on root-zone pH and water chemistry, meaning it may only be a lasting fix when iron can stay soluble and available.

Molybdenum is important because it helps plants convert nitrogen into usable building blocks for chlorophyll and growth, and it’s unique from many nutrients because it mainly supports enzyme-driven “nutrient use” rather than directly building plant tissue.

Nitrate Nitrogen provides a stable, easy-to-absorb form of nitrogen that supports steady growth, strong foliage, and reliable plant development without sudden nutrient swings.

Soluble potash (K2O) is important because it helps plants control water use, move sugars to new growth and fruit, and build stronger, higher-quality structure under stress. It’s unique from many other nutrients because it acts more like a regulator and transport helper than a direct “building material,” so the biggest benefits show up as steadier growth, stronger stems, and better finishing instead of just bigger leaves.

Sulfur is important because plants need it to build key amino acids and proteins that drive real growth, strong structure, and efficient use of nitrogen, making it uniquely different from “look-alike” nutrients that may change leaf color without supporting the plant’s core building process.

Total magnesium is important because magnesium powers chlorophyll and energy use, helping plants stay green, turn light into growth, and use other nutrients efficiently—and it’s unique because its problems often come from nutrient balance and uptake competition, not just a simple shortage.

Total Nitrogen is important because it directly drives leafy growth, chlorophyll production, and overall growth speed, which sets the pace for the entire plant. It’s unique because the “total” number can include different nitrogen forms that behave differently in the root zone, meaning the same total amount can produce very different results depending on the nitrogen type and plant stage.

Urea nitrogen is important because it can supply a high-impact source of nitrogen that supports chlorophyll production and fast leafy growth, but it’s unique from other nitrogen forms because it usually must convert in the growing environment before roots can use it consistently, making correct application and conditions critical for avoiding loss, burn, or sudden imbalance.

Water soluble iron (Fe) is important because it becomes available quickly, helping plants produce healthy green new growth when iron is limited or locked out. It’s unique because it works fast in the root zone compared to less available iron sources that may exist in the medium but can’t be absorbed easily, especially when pH conditions reduce iron uptake.

Water soluble magnesium is important because it quickly restores the plant’s ability to make chlorophyll and produce energy, which helps stop interveinal yellowing on older leaves and improves overall nutrient use; it’s unique because it becomes available immediately in water, making it faster and more predictable than slower magnesium sources.

Water-soluble manganese is important because it becomes available quickly to power photosynthesis and enzyme activity, helping plants stay greener and grow more efficiently. It’s unique from many other nutrients because it acts like an internal “growth engine” that drives key reactions rather than simply serving as a building material.

Its magnesium, ammonium, and phosphate are locked into a stable hexahydrate crystal that dissolves gradually and responds to root-zone chemistry, so nutrients appear over time rather than all at once. That slow mineral-to-solution transition makes it valuable for steady background nutrition and uniquely different from fully soluble salts, but it also means problems show up as delayed deficiencies or precipitation-related “nutrient dropouts” if conditions push it into the wrong form.

Manganese sulfate supplies manganese, a micronutrient that helps plants run key photosynthesis and enzyme processes, so new growth stays properly green and growth doesn’t quietly stall. It’s unique because it delivers manganese in a simple, fast-available form that responds strongly to root-zone conditions, so getting pH and balance right matters as much as adding the nutrient.

Polymer-coated monoammonium phosphate is unique because the polymer layer slows nutrient release, creating a steady phosphorus and ammonium supply right where roots grow instead of a quick spike that can be wasted or cause stress. That controlled timing matters because phosphorus is easily tied up in the root zone, and a consistent trickle supports stronger rooting while reducing the chance of sudden burn or uneven growth compared with faster-release sources.

Polymer-coated potassium nitrate releases nitrate nitrogen and potassium more slowly because a polymer shell controls how water enters and nutrients diffuse out, which helps keep feeding steadier over time. That steady delivery is important because it can reduce nutrient spikes and shortages, making growth more consistent than fast-dissolving potassium nitrate.

Polymer-coated urea is important because it feeds nitrogen gradually, reducing sudden spikes that can cause soft growth or later shortages. It is unique because the polymer coating controls the timing of nitrogen release based on moisture and temperature, so the plant gets a steadier supply instead of a fast burst.

Sodium molybdate supplies molybdenum, a trace micronutrient that helps plants convert nitrate nitrogen into usable building material, so growth and green color stay steady; it’s unique because it works as a tiny-dose “nitrogen unlocker” rather than a bulk nutrient.

It feeds plants with potassium plus magnesium and sulfur at the same time, so you improve water control and sugar movement while also supporting chlorophyll and protein building. That combination is unique because it helps prevent the common imbalance where adding potassium alone can worsen magnesium-related leaf paling, especially during fast growth.