Cal-Mag Emerald Harvest – Calcium and Magnesium Supplement with Kelp

Cal-Mag by Emerald Harvest is the structural insurance your crop needs to guarantee vigorous development and lush green foliage, acting as a powerful rescue against the most common deficiencies in cannabis cultivation. This professional supplement combines calcium, magnesium, and kelp extract to transform weak plants into robust nutrient-absorbing machines.

Are you seeing those dreaded rust spots on your leaves?

There is nothing more frustrating than watching your plants lose their color. You invest in the best lights and genetics, but suddenly, growth slows down, stems become brittle, and leaves turn pale or show necrotic spots. Does this sound familiar? It is the nightmare of every grower using soft water or LED lighting: the silent lack of Cal-Mag.

If you ignore these signs, the consequences are fatal: nutrient lockout, poor photosynthesis, and a harvest that weighs half of what it should. Your plants are crying out for building blocks, and if you don't provide them now, the stress will become irreversible, ruining weeks of hard work and dedication.

The solution is simpler than you think. Cal-Mag Emerald Harvest acts immediately to correct these imbalances. By providing the perfect ratio of calcium and magnesium, along with the bio-stimulant power of kelp, you not only fix the deficiency but also supercharge the plant's metabolism. It's the difference between a surviving plant and a thriving beast.

Why is this supplement essential for your setup?

This product isn't just "another bottle" on the shelf; it's a key tool, especially if you are an advanced grower. Using hydroponic and aeroponic systems or inert substrates like coco coir often means your base water lacks these essential micronutrients. This is where Cal-Mag shines, filling that gap and allowing your base nutrients to work at 100%.

Features, Advantages, and Benefits (FAB)

• Feature: Optimal ratio of Calcium and Magnesium enriched with Kelp extract.
• Advantage: It improves the regulation of water and nutrient transport within the plant while reducing environmental stress.
• Benefit: You will enjoy healthier, stress-free plants that focus all their energy on producing fat, resinous buds instead of fighting for survival.
• Feature: Contains essential Nitrogen and natural enzymes.
• Advantage: It stimulates the production of chlorophyll and activates the root zone.
• Benefit: Your grow room will look greener than ever, with a vegetative explosion that sets the perfect structure for a record-breaking flowering phase.
• Feature: Versatile formula compatible with any base nutrient brand.
• Advantage: You can integrate it into your current feeding chart without changing your favorite cannabis fertilizers.
• Benefit: It gives you total flexibility and peace of mind, knowing you have a "wildcard" that fixes problems regardless of the cultivation method you use.

How to use Cal-Mag Emerald Harvest correctly

Using this supplement is straightforward, but precision is key to getting the best results. It is designed to be used throughout the vegetative stage and the first weeks of flowering.

1. Shake well: Ensure the ingredients are mixed before opening.
2. Dosage: Add between 0.5 ml and 1.25 ml per liter of water. If you use reverse osmosis (RO) water, start with the higher dose to buffer the water before adding other nutrients.
3. Order matters: Add Cal-Mag to the water first, mix well, and then add your base fertilizers.
4. Frequency: Use it in every irrigation if you grow in Coco Mix 50L or hydro. In soil, alternate irrigations or use it when you detect the first signs of deficiency.
5. Stop: You can stop using it around week 6-7 of flowering, or when the plant stops demanding high levels of nitrogen.

Frequently Asked Questions

Can I use it as a foliar spray?

Yes, Cal-Mag is excellent for foliar application to correct acute deficiencies quickly. Use a lower dose (about 0.5 ml/L) and spray when the lights are off or just before they turn on to avoid burning the leaves.

Is it necessary if I grow in soil?

In nutrient-rich soil, it is not always mandatory, but it is highly recommended if you use powerful LED lights (which increase the demand for Cal-Mag) or if you water with very soft water. It acts as a preventative to ensure you never hit a wall during the stretch.

Does it affect the pH of the water?

It generally has a minimal impact, but because it contains minerals, it can slightly alter the EC and pH. Always measure and adjust your pH after adding all your nutrients to the tank.

Personal Experience of Pevgrow’s CEO (Alan)

"I've seen too many promising crops fall apart in the fourth week because the grower underestimated the importance of calcium. In my personal setups, especially when I'm testing fast-flowering genetics under high-intensity LEDs, Cal-Mag by Emerald Harvest is non-negotiable. I love that it includes kelp; you can really see the difference in the 'happiness' of the leaves, they stand up praying to the light almost immediately after watering.

For me, the key is using it as a buffer for RO water. I bring the EC up to 0.4 with this product before adding anything else. It stabilizes the pH swings in the tank and keeps the stems thick enough to support the heavy colas that come later. It's one of those bottles that lasts a long time but saves you a ton of headaches."