Newmarket, Ontario (Head Office)
1175 Stellar Drive, Unit #5
Newmarket, ON L3Y 7B8
- Mon10:00am–6:00pm
- Tue10:00am–6:00pm
- Wed10:00am–6:00pm
- Thu10:00am–6:00pm
- Fri10:00am–6:00pm
- Sat10:00am–4:00pm
- SunClosed
$0.00 CAD
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GreenPlanet Nutrients Horti Late Cal is a water-soluble dry fertilizer for late bloom support, built as a soluble mineral fertilizer that focuses on calcium and micronutrients when flowers are finishing and bulking.
Horti Late Cal is a zero-nitrogen formula designed for the late bloom phase. It’s positioned as Ca + micronutrients, delivering highly bioavailable calcium alongside essential micronutrients to support strong bulking, maintain plant health, and encourage vigorous development. That makes it an easy match for growers who want late-stage mineral support without adding nitrogen late in the cycle.
As part of the Horti commercial line, Horti Late Cal is made from water-soluble ingredients and is described as highly soluble and consistent in each batch. It’s also described as pH stable, with no fillers or contaminants, and zero sediment or organic material to block irrigation systems. Those chemistry-focused details matter in real gardens because they keep the product aligned with clean handling and dependable performance in modern feeding infrastructure.
On the system side, the Horti commercial line is described as a fully soluble fertilizer for use in day tank, injector, and dosing systems, which makes Horti Late Cal a practical fit for production-style setups that value consistency. It also fits late-stage programs that emphasize crop finish quality, where calcium support and a focused micronutrient profile can help keep development moving forward as flowering demand peaks.
This is a good fit for growers running late bloom programs who want a zero-nitrogen formula centered on Ca + micronutrients, with highly bioavailable calcium, strong bulking support, and a highly soluble, pH stable profile that stays clean in irrigation equipment.
Step-by-step mixing and feeding instructions for Green Planet Nutrients Horti Late Cal - 25 LBS.
Fill your reservoir or watering container with clean, room-temperature water first. Shake the bottle of Green Planet Nutrients Horti Late Cal - 25 LBS well before every use. Using the feeding schedule below, measure the recommended dose and add it directly to the water while stirring. Allow the solution to mix fully before adding any other fertilizers, additives, or supplements.
Always add nutrients to water — not the other way around. Mix thoroughly between products to ensure an even, stable nutrient solution.
Vegetative stage — Horti Late Cal
Flowering stage — Horti Late Cal
Warning – Important Safety Information
This product may cause mild skin irritation and eye irritation. Avoid unnecessary contact with skin, eyes, and clothing. Use only as directed.
General safety precautions
Read and follow all instructions on the product label and any accompanying documentation before use. Keep out of reach of children and pets. Do not ingest. Avoid breathing vapours, mist, or dust that may be generated during handling or use.
Wear appropriate personal protective equipment (PPE), such as protective gloves, long sleeves, long pants and closed-toe footwear. When there is a risk of splashing or airborne particles, use safety glasses or other suitable eye and face protection.
First aid – skin contact
IF ON SKIN OR HAIR: Remove contaminated clothing immediately. Rinse skin with clean water for several minutes, then wash with mild soap and water. If irritation or redness develops and persists, seek medical attention. Wash contaminated clothing before reuse.
First aid – eye contact
IF IN EYES: Rinse cautiously with clean water for several minutes, keeping eyelids open. Remove contact lenses if present and easy to do. Continue rinsing. If irritation persists, obtain medical advice.
First aid – ingestion and inhalation
IF SWALLOWED: Rinse mouth thoroughly with water. Do not induce vomiting unless instructed by a medical professional. Seek medical attention if you feel unwell.
IF INHALED: Move the person to fresh air and keep them comfortable for breathing. If coughing, breathing difficulty, dizziness or other symptoms occur, seek medical assistance.
Storage and handling
Store this product in its original closed container, in a cool, dry and well-ventilated area. Protect from extreme temperatures and direct sunlight. Keep container tightly sealed when not in use.
Avoid release to drains, natural waterways or outdoor soil. Dispose of unused product and empty containers in accordance with local regulations and the directions on the label.
Important: If medical advice is needed, keep the product label or container available. Always follow the specific instructions and safety recommendations provided by the manufacturer. This safety notice is intended as general guidance and does not replace official label directions or documentation.
| Total Calcium (Ca) | 10.0% |
|---|---|
| Calcium Acetate (Ca) | 7.0% |
| Calcium Chloride (Ca) | 3.0% |
| Boron (B) | 0.06% |
| Chelated Copper (Cu) | 0.02% |
| Chelated Iron (Fe) | 0.3% |
| Chelated Manganese (Mn) | 0.09% |
| Molybdenum (Mo) | 0.009% |
| Chelated Zinc (Zn) | 0.02% |
| Chlorine (Cl) | 7.0% |
Boron is essential because it stabilizes cell walls, supports root and shoot growth, and regulates sugar movement throughout the plant. What makes boron unique is its limited mobility and extremely narrow range between deficiency and excess, which causes new growth to show symptoms rapidly when levels fall out of balance.
Calcium acetate is important because it can provide fast-available calcium that supports strong new growth, smooth leaf formation, and resilient roots when plants are growing quickly. It’s unique because the acetate pairing helps it dissolve and behave smoothly in solution, making it useful for fine-tuning calcium supply without relying on slow breakdown, while still requiring balanced nutrition and healthy water movement to work.
Calcium chloride is different because it dissolves extremely fast and can deliver calcium quickly to new growth, which is where calcium problems show up first. It’s important because calcium supports strong new tissue and stable growth tips, but it’s unique because it also adds chloride and has higher salt strength, so it must be used carefully to avoid leaf burn or root-zone salt stress.
Chelated copper is important because it supports key enzyme systems that drive energy flow, strong tissue formation, and healthy new growth, while chelation keeps copper available and stable in the root zone. It’s unique because plants need it in extremely small amounts and it can become unavailable or toxic more easily than many other micronutrients, so chelated forms help deliver precise, predictable copper without big swings.
Chelated iron is important because it keeps iron usable for plants even when growing conditions would normally lock iron out, helping prevent the classic yellow-new-leaf symptom caused by low chlorophyll production. It is unique from other iron sources because the chelation protects iron from becoming insoluble, making it a more reliable way to correct iron-related chlorosis when regular iron can fail.
Chelated manganese is important because it keeps manganese available for photosynthesis and enzyme activity even when pH or water chemistry would normally lock it out, and it’s unique from similar micronutrients because it strongly supports the plant’s energy-processing systems that drive healthy, resilient new growth.
Chelated zinc is important because it keeps zinc available for uptake even when pH or root-zone conditions would normally lock zinc out, helping plants form normal-sized, healthy new growth—something that makes zinc uniquely different from many other nutrients that mainly affect older leaves or simple leaf color changes.
Chlorine, mainly as chloride (Cl⁻), helps plants control water balance and stomata function, supporting steady leaf pressure and efficient photosynthesis, and it’s unique from many nutrients because deficiency is rare while excess buildup is a more common risk that shows up as leaf-edge burn and salt stress.
Copper EDTA helps keep copper dissolved and available to roots longer, so plants can absorb it more consistently when copper would otherwise tie up in the growing medium. It’s important because copper supports enzyme activity and healthy new growth, and it’s unique because the chelate improves predictability while allowing very small, controlled copper dosing.
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.
Total calcium is important because it builds strong cell walls and supports healthy new growth, roots, and overall plant stability. It’s unique because plants can’t easily move calcium from old leaves to new growth, so calcium problems show up first at the tips and newest leaves when delivery through water movement and transpiration falls behind.
Iron EDTA keeps iron dissolved and available long enough for roots to absorb it, which is why it can quickly improve new growth color when iron is tied up in the root zone. It’s unique because the EDTA chelate balances stability and accessibility, making iron more reliably usable in mildly acidic to near-neutral conditions compared to many non-chelated iron forms.
Manganese EDTA is unique because the EDTA chelate keeps manganese stable and more available during delivery, helping plants absorb it more reliably when manganese would otherwise lock up. This matters because manganese drives key enzyme functions tied to photosynthesis and healthy new growth, so consistent availability can prevent pale, chlorotic young leaves and stalled vigor.
Sodium borate mainly supplies boron, a micronutrient plants need in tiny amounts to build healthy new growth and develop flowers and fruit normally, but it’s unique because the safe range is narrow and too much can quickly cause tip damage and leaf burn.
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.
Zinc EDTA is important because it keeps zinc available in the root zone when pH or water chemistry would normally tie zinc up, helping new growth develop normally before deficiency symptoms get worse. It’s unique from other zinc forms because the EDTA chelate shields zinc in solution, making delivery more consistent when conditions are not ideal.

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