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Pairs well with
Built to support every stage
Horti Cal by Green Planet is the backbone of a solid feeding plan. With 14-0-0 plus added calcium and magnesium, it keeps plants strong, upright, and firing on all cylinders from veg through to late flower. Whether you're growing in coco, hydro, or soil, this dry cal-mag formula fills in the gaps and fuels vigorous development at every stage.
🔹 Key Features
🌿 Full-Cycle Strength — Supports plant structure and health from seedling to harvest.
🥛 Ca+Mg+N Formula — Delivers calcium, magnesium, and nitrogen for balanced growth and cell strength.
🤌 Clean & Reliable — Dry and stable, perfect for precision growers and long-term storage.
🛠️ How to Use It
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Follow the Horti feeding schedule for your system.
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Mix thoroughly into reservoir or pre-blend into media.
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Use throughout both vegetative and flowering stages.
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For best results, pair with Horti Grow during veg and Horti Bloom/Late Bloom during flower.
🌟 Grow Guys Tips
Coco growers, this is your must-have. Horti Cal ensures you're never short on Ca or Mg when it counts. It's also a solid buffer when running soft water or dealing with yellowing between veins.
🥤 Perfect For
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Coco and hydro systems needing stable Ca+Mg support
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Soil growers using RO or low-Ca tap water
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Veg and bloom cycles needing extra strength and structure
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Fans of dry nutrients and full-spectrum programs
📦 Specs & Stuff
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NPK: 14-0-0
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Contains: Calcium and Magnesium
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Weight: 2.3 kg
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Use: Veg through to end of flower
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Form: Dry soluble supplement
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System Compatibility: Soil, Coco, Hydro
🚀 Stronger roots, thicker stems, better results
Give your plants the backup they need to grow strong and finish even stronger. Stock up on Horti Cal at The Grow Guys and keep your garden solid from start to finish.