Powder Feeding Cal Mag · Green House Calcium & Magnesium Supplement

Powder Feeding Cal Mag by Green House is a highly concentrated, 100% soluble calcium and magnesium supplement designed to fortify your cannabis plants and maximize nutrient uptake. By delivering these essential secondary macronutrients in a pure powder form, it ensures your crop builds robust cell walls and stays vigorously green, completely eliminating the risk of devastating deficiencies.

You are probably using reverse osmosis (RO) water or soft tap water to keep your grow clean, but suddenly your plants start showing rusty brown spots and pale, yellowing leaves.

Watching your prized genetics struggle with stunted growth and weak stems is incredibly frustrating. Liquid Cal-Mag supplements often feel like a rip-off because you are essentially paying for heavy bottles of water, and constantly measuring out weak liquid doses wastes your time while your plants continue to suffer from nutrient lockouts.

Powder Feeding Cal Mag steps in as the ultimate game-changer for your nutrient regimen. This ultra-concentrated powder instantly dissolves in water, delivering a precise, potent dose of calcium and magnesium that rescues your plants, restores their vibrant green color, and sets the stage for massive, heavy yields.

Why this Cal-Mag powder outshines your liquid supplements

If you are used to lugging around heavy jugs of liquid Cal-Mag, making the switch to this powder format will blow your mind. Liquid formulas are mostly water, meaning you burn through them quickly and spend more on shipping. With Green House's powder, you get pure, unadulterated active ingredients that last for multiple grow cycles.

Plus, the stability of this powder is unmatched. It won't degrade on your shelf like some liquid cannabis fertilizers do over time. You mix exactly what you need, when you need it, ensuring your plants always get a fresh, highly bioavailable dose of calcium and magnesium to keep their metabolism running at peak performance.

Key features you’ll notice from the very first grow

• Because it is a 100% soluble powder, you can mix it instantly without leaving residue, which means your irrigation lines stay clean and your plants absorb the nutrients immediately.
• Because it contains a highly balanced ratio of Calcium, Magnesium, and Nitrogen, you can correct deficiencies in record time, which means your leaves will regain their lush green color and photosynthesis will skyrocket.
• Because it is highly concentrated, you only need a tiny amount per liter, which means you save a ton of money and space in your grow room.
• Because it is compatible with all substrates, you can use it seamlessly in hydroponic and aeroponic systems as well as coco or soil, which means you have total versatility no matter how you choose to grow.

Who this product is especially interesting for

This supplement is a must-have in the arsenal of any serious grower who wants to push their plants to the limit without running into nutritional roadblocks.

• Growers using Reverse Osmosis (RO) water or rainwater who need to rebuild their water's base EC.
• Coco coir enthusiasts, since coco naturally binds to calcium and magnesium, requiring a constant extra supply.
• Budget-conscious cultivators who are tired of paying for water weight in liquid supplements.
• Growers dealing with heavy-feeding genetics that demand high levels of Cal-Mag during peak vegetative and early flowering stages.

How to integrate it into your routine without overcomplicating things

Using this powder is super chill and straightforward. The golden rule is to always add your Powder Feeding Cal Mag to your water before adding any other base nutrients or boosters. This ensures it dissolves completely and establishes a solid EC baseline.

If you are using RO water, simply mix the powder until your water reaches an EC of 0.3 to 0.4 mS/cm. Once that's dialed in, you can proceed to add your regular nutrients. It works perfectly whether you are growing in high-tech hydro setups or traditional soil for cannabis.

Frequently Asked Questions

When should I start using Powder Feeding Cal Mag?

You should start using it from the early vegetative stage, especially if you are using RO water or coco coir, and continue through the flowering stage to prevent any deficiencies.

Can I use this as a foliar spray?

Yes! If you spot a severe deficiency, you can mix a very light dose and use it as a foliar spray for rapid absorption, but root feeding is the best long-term solution.

How should I store the powder?

Keep it in a cool, dry place and make sure the bag is sealed tight. Since it's a dry powder, moisture is its only enemy. Stored correctly, it will last for years.

Personal Experience of Pevgrow’s CEO (Alan)

I used to be that guy buying massive 5-liter jugs of liquid Cal-Mag, thinking I was getting a great deal. Then I realized I was basically paying to ship water across the country. When I switched to Powder Feeding Cal Mag by Green House, it completely changed my workflow. I run a lot of coco coir setups with RO water, and this powder dissolves so cleanly that my drippers never clog. The plants respond almost overnight—those rusty spots stop dead in their tracks, and the stems get thick and sturdy. It's incredibly cost-effective, and honestly, once you go powder for your Cal-Mag, you'll never want to lug a heavy plastic jug into your grow room again. Highly recommended for anyone who wants professional results without the extra hassle.