11 Best Cal Mag Supplements for Thriving Plants

Discover the best cal mag supplement for plants to boost growth and vitality. Unlock your garden’s potential with our top picks and savvy tips.
BrandMy RatingPrice
Gardenera
Top Affordable Choice
9.2/10
Humboldts Secret
Best for Hydroponics
9.2/10
Botanicare
Best for Indoor Gardens
9.4/10
Gs Plant Foods
Best for Vibrant Foliage
9.4/10
Bloom City
9.2/10

Best Cal Mag Supplement for Plants

In the vibrant world of gardening, ensuring your plants thrive requires the right balance of nutrients—a challenge easily met with the right calcium and magnesium (cal mag) supplement. These key minerals play a crucial role in promoting robust growth and lush foliage, making them essential allies for every green thumb. Dive into our curated selection of the best cal mag supplements for plants, and watch your garden blossom like never before.

Top Affordable Choice: Gardenera Cal-Mag Plus

𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 Grade Organic Cal-Mag Plus Growing Fertilizer Concentrate: Calcium, Magnesium, Iron & Micronutrients Supplement for Plant Deficiencies (9-0-0 NPK) - 8oz Bottle
Highlights
Professional grade quality
Easy to use
Contains multiple micronutrients

We absolutely love the Gardenera Professional Grade Organic Cal-Mag Plus!

It's our "Top Affordable Choice" for a reason.

This professional-grade supplement delivers essential calcium and magnesium, correcting common deficiencies with ease.

We appreciate how simple it is to use—just a spray on the leaves and stems during watering unlocks the full potential of your plants.

Plus, its rich blend of micronutrients enhances overall health without any harmful additives, making it a win for organic gardeners.

If you're looking for a reliable, cost-effective solution, this Cal-Mag is definitely worth considering to nurture robust growth. 🌱✨

Be sure to also check out the best iron supplement for lawns for more options! Also, here is the price history so you know exactly when to buy!

Price history for Gardenera Cal-Mag Plus on Amazon

Best for Hydroponics: Humboldts Secret

Humboldts Secret Calcium, Magnesium and Iron Supplement – Hydroponic Supplies – Liquid Nutrient Fertilizer – Supports Vegetative and Flowering Stage – 1 Gallon
Highlights
Corrects nutrient deficiencies
Great for hydroponics
Responsive customer support

We’ve crowned Humboldts Secret Calcium, Magnesium, and Iron Supplement as our top pick for hydroponics, and here’s why!

This powerful elixir is engineered to correct common nutrient deficiencies in flowering plants, ensuring your green friends thrive during both vegetative and blooming phases.

With a well-balanced formula, it not only enhances nutrient uptake but also supports your plants’ growth, whether in hydroponic systems, soil, or container gardens.

Plus, it’s perfect for coco coir mediums and reverse osmosis water.

Just keep in mind that precise mixing is key.

Say goodbye to plant woes and hello to lush greenery! 🌱✨

Be sure to also check out the best animal repellent for yard for more options! Also, here is the price history so you know exactly when to buy!

Price history for Humboldts Secret on Amazon

Best for Indoor Gardens: Botanicare Cal-Mag Plus

Botanicare Cal-Mag Plus, A Calcium, Magnesium, And Iron Plant Supplement, Corrects Common Plant Deficiencies, Add To Water Or Use As A Spray, 2-0-0 NPK, Quart
Highlights
Highly effective formula
Easy to mix and use
Improves plant health

When it comes to nurturing your indoor garden, Botanicare Cal-Mag Plus stands out as our top pick!

Designed to tackle common deficiencies, this supplement is a powerhouse packed with calcium, magnesium, and iron.

With its user-friendly liquid formula, just mix it with your water for beautifully healthy plants.

This versatile product shines whether you’re using containers, soil, or hydro systems.

Our team loves how it promotes robust root development and vibrant plant growth.

Just keep in mind, you'll need to follow the specific mixing guidelines for optimal results.

Overall, this is a must-have for any indoor gardening enthusiast!

Be sure to also check out the best animal repellent for gardens for more options! Also, here is the price history so you know exactly when to buy!

Price history for Botanicare Cal-Mag Plus on Amazon

Best for Vibrant Foliage: GS Plant Foods Cal-Mag

GS Plant Foods Cal-Mag 420 Dry Super Concentrate, Makes 420 Gallons of Nutrient Solution, 18 Ounces, Calcium/Magnesium Fertilizer
Highlights
Water soluble for easy use
Suitable for all plant stages
Value for money

When it comes to enhancing plant health, GS Plant Foods Cal-Mag 420 truly stands out as our pick for Best for Vibrant Foliage.

This concentrated nutrient solution is a game changer with its impressive formulation—packed with Calcium (13%), Sulfur (4%), and Magnesium (3%)—that supports lush growth in all stages of development.

We love how convenient this completely water-soluble powder is; one container mixes enough solution for 420 gallons of irrigation or foliar spray.

Just remember, precise mixing is key!

Overall, for plants craving robust nutrition, this is a solid choice that won't disappoint!

Be sure to also check out the best floating shelves for plants for more options! Also, here is the price history so you know exactly when to buy!

Price history for GS Plant Foods Cal-Mag on Amazon

Bloom City Cal-Mag Fertilizer

Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, Quart (32 oz)
Highlights
Easy mixing directions
Nutrient-focused formula
Suitable for any skill level

When it comes to keeping your plants in tip-top shape, the Bloom City Cal Mag supplement is a breath of fresh air!

With easy mixing directions—just add 2-5ml per gallon of feedwater—it slots effortlessly into your plant care routine.

This nutrient-focused formula packs a punch with calcium and magnesium, crucial for strong stems and lush leaves.

We love its versatility; whether you’re nurturing houseplants or cultivating an outdoor garden, it adapts to your needs.

Ideal for gardeners of any skill level, this supplement supports consistent growth and vibrant leaf color.

Just remember, you might need to use it frequently for the best results!

Be sure to also check out the best frost blanket for plants for more options! Also, here is the price history so you know exactly when to buy!

Price history for Bloom City Cal-Mag Fertilizer on Amazon

TPS Nutrients Cal-Mag

TPS NUTRIENTS Organic Cal-Mag OAC Plant Nutrient and Supplement, Plus Iron and Micronutrients 1 Quart (32 oz)
Highlights
High calcium content
Organic formulation
Versatile for all plants

When it comes to boosting your plants' health, we think the TPS Nutrients Cal Mag Supplement is a fantastic choice!

With a simple mixing solution—just 5-10 ml per gallon of water—it's perfect for both newbies and seasoned green thumbs.

Packed with essential nutrients like calcium, magnesium, and iron, this organic formula addresses common growth concerns, ensuring your plants thrive.

While it does have a bit of a strong vinegar smell and requires precise mixing, the benefits outweigh these minor issues.

So, if you're looking to enhance your garden's vitality, we wholeheartedly recommend adding this gem to your routine!

Be sure to also check out the best misting system for patio for more options! Also, here is the price history so you know exactly when to buy!

Price history for TPS Nutrients Cal-Mag on Amazon

Nutriling Cal Mag Cal Mag Supplement for Plants

Cal Mag for Plants. Boost Your Plants Health. Earth Force 2-0-0 CalMag Fertilizer with add it Liquid Kelp and Seaweed Plant Nutrients Perfect for Soil, Coco Coir, and Hydroponic Garden Nutrients. 32OZ
Highlights
Promotes robust growth
Versatile for various setups
Easy to use measuring tools

When it comes to giving your plants the best support, we believe the premium Cal Mag for Plants is a standout choice!

This meticulously crafted formula provides essential nutrients that promote robust growth and vibrant blooms.

Whether you’re nurturing tomatoes in soil or experimenting with hydroponics, its versatility shines.

We’re particularly impressed by how it activates plant enzymes, boosting nutrient absorption and fortifying immunity against deficiencies.

However, be mindful that it can spill easily from its bottle and may gum up supply lines; a bit of care goes a long way.

Overall, this Cal Mag supplement is perfect for both novice and experienced gardeners aiming for a flourishing garden!

Be sure to also check out the best repellent for lizards for more options! Also, here is the price history so you know exactly when to buy!

Price history for Nutriling Cal Mag on Amazon

General Hydroponics CALiMAGic

General Hydroponics CALiMAGic 1-0-0, Concentrated Blend of Calcium & Magnesium, Secondary Nutrient Deficiencies Helps Prevent Blossom End Rot & Tip Burn, Clean, Soluble, 1-Quart
Highlights
Prevents nutrient deficiencies
Works well in hydroponics
Easy to mix and use

When it comes to providing essential nutrients for your plants, CALiMAGic 1-0-0 is a top contender.

We love how this concentrated blend of calcium and magnesium effectively tackles nutrient deficiencies in fast-growing plants.

With its ability to prevent blossom end rot and tip burn in calcium-hungry beauties like tomatoes and lettuce, it’s a gardener's best friend.

Plus, it mixes easily with other fertilizers and won’t clog your equipment—big win!

Just keep in mind that while the potency is unmatched, it doesn’t come with a measuring tool, so be prepared to estimate your doses.

Overall, a solid choice for thriving greenery!

Be sure to also check out the best amino acids for plants for more options! Also, here is the price history so you know exactly when to buy!

Price history for General Hydroponics CALiMAGic on Amazon

Cal-Mag Complete

Cal-Mag Complete, Calcium Magnesium Iron and Micronutrients Fertilizer and Supplement by TPS Nutrients, 1 Quart (32 oz)
Highlights
Complete nutrient profile
No harmful EDTA
Sustainable ingredients

When it comes to enhancing plant growth, TPS Nutrients CalMag Complete delivers a comprehensive package.

We love that it includes a complete array of calcium, magnesium, and essential micronutrients, ensuring your plants thrive from vegetative growth to blooming.

What sets it apart?

This fertilizer is energy-dense and truly shines with fast-growing plants, effectively tackling issues like blossom end rot.

Plus, you can rest easy knowing it’s free from harmful EDTA and designed with sustainability in mind.

However, be cautious with your measurements to avoid overuse.

Overall, it’s a fantastic choice for anyone looking to nourish their greenery!

Be sure to also check out the best garland for mantle for more options! Also, here is the price history so you know exactly when to buy!

Price history for Cal-Mag Complete on Amazon

FoxFarm Cal-Mag Cal Mag Supplement for Plants

FoxFarm BushDoctor Cal-Mag - Liquid Calcium & Magnesium Supplement, Prevents Blossom End Rot & Tip Burn - Formula with 3% Calcium, 0.9% Magnesium for Gardening- NPK 1-0-0 (Pint)
Highlights
Prevents tip burn
Easy application process
Nutrient-rich formula

We’re excited to highlight FoxFarm Cal Mag for plants, an essential supplement that can transform your garden.

Say goodbye to tip burn troubles—this nutrient-rich formula is a game-changer for vibrant, healthy plants.

With a clever blend of 3% calcium and 0.9% magnesium, we’ve noticed remarkable improvements in fruit and vegetable quality.

The application is as easy as 1-2-3: just mix 1 tsp per gallon of water, and you’re set!

While some pH monitoring is necessary, the rewards are worth it as your plants develop resilience and robust structures.

For thriving growth, FoxFarm is a must-try!

Be sure to also check out the best algaecide for fountains for more options! Also, here is the price history so you know exactly when to buy!

Price history for FoxFarm Cal-Mag on Amazon

Lotus Nutrients

15oz Cal-Mag Supplement for Enhanced Plant Growth - Naturally Derived Premium Powdered Nutrient with Calcium and Magnesium for Soil, Hydroponic, and Coco Coir - Lotus Nutrients for Indoor and Outdoor
Highlights
Natural ingredients
High effectiveness
Affordable price

When we tried Lotus Nutrients Cal-Mag Supplement, we were impressed by its natural formulation and effectiveness.

This powder blends effortlessly into your garden routine, promoting robust growth from seed to harvest.

Designed for the diverse needs of both soil and hydroponics, it truly caters to various setups.

We did notice that it requires some mixing and has limited coverage per ounce—so, if you're not a fan of DIY blends, this might slow you down a bit.

Overall, if you're seeking to boost the potency and yield of your plants, Lotus Nutrients is a solid choice!

Be sure to also check out the best large indoor plant pots for more options! Also, here is the price history so you know exactly when to buy!

Price history for Lotus Nutrients on Amazon

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