Calcium and magnesium supplements for coco, hydroponic and soil gardens. Brands include Botanicare, Emerald Harvest, Roots Organics, Cutting Edge, FoxFarm, Flying Skull and House & Garden, in sizes from 1-quart bottles to bulk jugs.
Cal-Mag Supplements
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Drip Hydro Drip Hydro Cal Mag - GAL
• Our highly-concentrated Calcium and Magnesium supplement. • Designed to be used throughout both the vegetative and flowering stages of any fruit or flower-producing plants. • Also contains Nitrogen and Iron. • Dilution: 1-2 mL (0.03-0.07 fl. oz) per 4 L (1 gallon) of water, through Weeks 1-5 of any fruit or flower producing plants. With a Calcium to Magnesium ratio of 4:1, CaMg is more concentrated than most other cal-mags on the market. This formulation of Calcium and Magnesium, as well as additional Nitrogen and Iron, provides your plants with the additional micro-nutrients they require and desire in Veg and Weeks 1-5 of Flowering. Calcium is critical to plant development. It is needed in large amounts by all plants for the formation of cell walls, cell membranes, and it plays a vital role in your medium’s structure. Due to the immobility of calcium in a medium and in plant tissues, a continuous supply must be present for your plants to access and uptake it. Magnesium is the powerhouse behind photosynthesis in plants. Without magnesium, chlorophyll cannot capture the light energy needed for photosynthesis. Even though there is Calcium and Magnesium in our Base A & B formulas, certain plant strains, growing mediums, and environments may require supplementation of a higher concentration of these micro-nutrients. Maximize your plants' genetic potential for growth and production in any growing medium.
$40.00 $23.80
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Drip Hydro Drip Hydro Cal Mag - 2.5 GAL
• Our highly-concentrated Calcium and Magnesium supplement. • Designed to be used throughout both the vegetative and flowering stages of any fruit or flower-producing plants. • Also contains Nitrogen and Iron. • Dilution: 1-2 mL (0.03-0.07 fl. oz) per 4 L (1 gallon) of water, through Weeks 1-5 of any fruit or flower producing plants. With a Calcium to Magnesium ratio of 4:1, CaMg is more concentrated than most other cal-mags on the market. This formulation of Calcium and Magnesium, as well as additional Nitrogen and Iron, provides your plants with the additional micro-nutrients they require and desire in Veg and Weeks 1-5 of Flowering. Calcium is critical to plant development. It is needed in large amounts by all plants for the formation of cell walls, cell membranes, and it plays a vital role in your medium’s structure. Due to the immobility of calcium in a medium and in plant tissues, a continuous supply must be present for your plants to access and uptake it. Magnesium is the powerhouse behind photosynthesis in plants. Without magnesium, chlorophyll cannot capture the light energy needed for photosynthesis. Even though there is Calcium and Magnesium in our Base A & B formulas, certain plant strains, growing mediums, and environments may require supplementation of a higher concentration of these micro-nutrients. Maximize your plants' genetic potential for growth and production in any growing medium.
$90.00 $53.55
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Drip Hydro Drip Hydro Cal Mag - Quart
• Our highly-concentrated Calcium and Magnesium supplement. • Designed to be used throughout both the vegetative and flowering stages of any fruit or flower-producing plants. • Also contains Nitrogen and Iron. • Dilution: 1-2 mL (0.03-0.07 fl. oz) per 4 L (1 gallon) of water, through Weeks 1-5 of any fruit or flower producing plants. With a Calcium to Magnesium ratio of 4:1, CaMg is more concentrated than most other cal-mags on the market. This formulation of Calcium and Magnesium, as well as additional Nitrogen and Iron, provides your plants with the additional micro-nutrients they require and desire in Veg and Weeks 1-5 of Flowering. Calcium is critical to plant development. It is needed in large amounts by all plants for the formation of cell walls, cell membranes, and it plays a vital role in your medium’s structure. Due to the immobility of calcium in a medium and in plant tissues, a continuous supply must be present for your plants to access and uptake it. Magnesium is the powerhouse behind photosynthesis in plants. Without magnesium, chlorophyll cannot capture the light energy needed for photosynthesis. Even though there is Calcium and Magnesium in our Base A & B formulas, certain plant strains, growing mediums, and environments may require supplementation of a higher concentration of these micro-nutrients. Maximize your plants' genetic potential for growth and production in any growing medium.
$16.00 $9.99
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Biobizz BioBizz CalMag 1 Liter
BioBizz CalMag is a liquid calcium and magnesium supplement for growers who need extra Ca and Mg, whether they water with soft tap water or RO water. BioBizz describes it as a 100% organic, certified formula that won't change your preferred feeding program. This listing is the 1 liter bottle. Key features Supplies calcium and magnesium, which play a key role in cell production and photosynthesis. For growing and blooming, indoors or outdoors. Works with regular watering and with hydroponics. Suitable for use in organic farming, according to BioBizz. How to use Add CalMag to your water first. Mix in your BioBizz fertilizers. Adjust the pH of the nutrient mix. Water as usual. BioBizz's current data sheet gives the dose as "on demand" rather than a fixed rate, so dose to suit your water and follow the label. Good to know The BioBizz feeding schedule calls for CalMag when you use soft or RO water. Store dry, at room temperature and away from direct light. Keep out of reach of children.
$34.99 $31.49
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Botanicare Botanicare Cal-Mag Plus - 5 GAL
Cal-Mag Plus is a highly fortified calcium, magnesium and iron plant supplement formulated to correct common deficiencies. Supplementing your preferred nutrient program with Cal-Mag Plus is strongly recommended when using reverse osmosis water and when growing in coco coir-based medias to compensate for natural calcium draw. Cal-Mag Plus can also be applied as a foliar spray to further enhance growth.
$257.59 $231.83
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FloraFlex FLORAFLEX® NUTRIENTS - CAL + MAG + IRON (1 GAL)
FloraFlex Cal + Mag + Iron is a liquid supplement from FloraFlex that adds calcium, magnesium and iron to a nutrient mix. It is for growers whose source water runs low in calcium and magnesium. This listing is the 1 gallon (3.78 L) size. Good to know FloraFlex's mixing guide says to treat cal-mag as an extension of Part A: add it first and let it dissolve before Part B goes into the tank. Follow the feed rate printed on the label.
$31.50 $28.35
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Botanicare Botanicare Cal-Mag Plus - 2.5 GAL
Cal-Mag Plus is a highly fortified calcium, magnesium and iron plant supplement formulated to correct common deficiencies. Supplementing your preferred nutrient program with Cal-Mag Plus is strongly recommended when using reverse osmosis water and when growing in coco coir-based medias to compensate for natural calcium draw. Cal-Mag Plus can also be applied as a foliar spray to further enhance growth.
$137.10 $123.39
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Botanicare Botanicare Cal-Mag Plus - 1 GAL
Cal-Mag Plus is a highly fortified calcium, magnesium and iron plant supplement formulated to correct common deficiencies. Supplementing your preferred nutrient program with Cal-Mag Plus is strongly recommended when using reverse osmosis water and when growing in coco coir-based medias to compensate for natural calcium draw. Cal-Mag Plus can also be applied as a foliar spray to further enhance growth.
$62.90 $56.61
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Botanicare Botanicare Cal-Mag Plus - 1 QT
Cal-Mag Plus is a highly fortified calcium, magnesium and iron plant supplement formulated to correct common deficiencies. Supplementing your preferred nutrient program with Cal-Mag Plus is strongly recommended when using reverse osmosis water and when growing in coco coir-based medias to compensate for natural calcium draw. Cal-Mag Plus can also be applied as a foliar spray to further enhance growth.
$24.13 $21.72
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FoxFarm FoxFarm Bush Doctor Cal-Mag - 1 qt
Cal-Mag Supplement1 - 0 - 0, 3% Calcium 0.9% MagnesiumNobody likes blossom end rot or tip burn. That’s why FoxFarm brings you BUSH DOCTOR CAL-MAG. Calcium and magnesium help strengthen cell walls and aid in fruit development, helping you avoid the costly and frustrating deficiencies that cause these problems. OMRI Listed and CDFA Registered for Organic Gardening.
$26.75 $24.07
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Roots Organics Roots Organics CalMag - 1 GAL
Roots Organics CalMag is a pure and all natural blend of calcium, magnesium and sulfur to support plants during fast growth. By creating a product free of added nitrogen, phosphate, and potassium, Roots Organics give you control to supplement as needed without affecting primary fertility input ratios. Use in combination with high quality base fertilizers like Roots Organics Buddha Grow and Buddha Bloom.Free of added nitrogen, phosphate, and potassiumIdeal for fast-growing and heavy feeding plantsDerived from Kieserite, Gypsum
$96.39 $86.75
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Roots Organics Roots Organics CalMag - 1 QT
Roots Organics CalMag is a pure and all natural blend of calcium, magnesium and sulfur to support plants during fast growth. By creating a product free of added nitrogen, phosphate, and potassium, Roots Organics give you control to supplement as needed without affecting primary fertility input ratios. Use in combination with high quality base fertilizers like Roots Organics Buddha Grow and Buddha Bloom.Free of added nitrogen, phosphate, and potassiumIdeal for fast-growing and heavy feeding plantsDerived from Kieserite, Gypsum
$28.90 $26.01
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Flying Skull Flying Skull Cal Mag Extreme - 1 QT
During bloom, plants really need calcium and magnesium. Although they're technically classified as micro-nutrients, calcium and magnesium are just as import to the success of your plants and yield as NPK. Flying Skull have also added Vitamin B1 and Iron to Cal-Mag eXtreme. Cal-Mag eXtreme can also be used as a leaf feed to correct leaf curl.
$13.95
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FloraFlex FLORAFLEX® NUTRIENTS - CAL + MAG + IRON (5 GAL)
FloraFlex Cal + Mag + Iron is a liquid supplement from FloraFlex that adds calcium, magnesium and iron to a nutrient mix. It is for growers whose source water runs low in calcium and magnesium. This listing is the 5 gallon size. Good to know FloraFlex's mixing guide says to treat cal-mag as an extension of Part A: add it first and let it dissolve before Part B goes into the tank. Follow the feed rate printed on the label.
$147.40 $111.95
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Cutting Edge Solutions Cutting Edge Cal Mag Amplified - 1 QT
Cal-Mag Amplified is an ideal choice for supplementing your native soil with pure, rapidly absorbable forms of calcium and magnesium.Coco coir growers will greatly benefit from the use of Cal-Mag Amplified by providing additional calcium to buffer the coco and maximize cation exchange capacity. Higher levels of magnesium are necessary for some plant varieties and heirlooms that originate from equatorial regions. The additional source of magnesium in Cal-Mag Amplified will drive chlorophyll production and maximize photosynthesis. Plants fortified with calcium and magnesium exhibit lush green leaves and reward the farmer with heavy fruits.Foliar application is also highly recommended as a way to provide the plants with direct sources of calcium to fortify cell walls through the apolplast pathway, freeing mobile calcium to be used for fruit set. Spray when the sun is first rising or setting for the night to ensure stomata are fully dilated.
$23.99
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Cutting Edge Solutions Cutting Edge Cal Mag Amplified - 1 GAL
Cal-Mag Amplified is an ideal choice for supplementing your native soil with pure, rapidly absorbable forms of calcium and magnesium.Coco coir growers will greatly benefit from the use of Cal-Mag Amplified by providing additional calcium to buffer the coco and maximize cation exchange capacity. Higher levels of magnesium are necessary for some plant varieties and heirlooms that originate from equatorial regions. The additional source of magnesium in Cal-Mag Amplified will drive chlorophyll production and maximize photosynthesis. Plants fortified with calcium and magnesium exhibit lush green leaves and reward the farmer with heavy fruits.Foliar application is also highly recommended as a way to provide the plants with direct sources of calcium to fortify cell walls through the apolplast pathway, freeing mobile calcium to be used for fruit set. Spray when the sun is first rising or setting for the night to ensure stomata are fully dilated.
$61.99
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House & Garden House & Garden Commercial CalMag, 5 lbs Pouch
House & Garden Commercial CalMag is a readily available calcium/magnesium fertilizer designed to encourage rapid growth and reduce problems associated with calcium and magnesium deficiencies. Commercial CalMag is designed to be used with House & Garden Commercial grow throughout the vegetative phase, and it should be used with House & Garden Commercial Bloom during the flowering phase. Recipe charts are available online at https://house-garden.us/.House & Garden Commercial CalMag can also be used as a supplement with other nutrient regimens and is highly recommended for use with reverse osmosis water and when growing plants in coco coir.
$55.00 $49.50
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Advanced Nutrients Sensi Cal Mag Xtra 23L
Advanced Nutrients Sensi Cal-Mag Xtra is a calcium and magnesium supplement that also supplies iron, manganese and zinc, plus kelp. Use it to correct deficiencies, or preventively when you grow in coco, use RO or soft water, or run a high-demand garden. This listing is the 23 L size. Key features NPK 4-0-0, per Advanced Nutrients. Chelated calcium and magnesium, plus chelated iron. Chelated manganese and zinc. Kelp supplies vitamins and amino acids. For the vegetative and blooming stages, indoors or outdoors, with hand watering, watering systems, hydroponics, coco coir and foliar application. Designed for hydroponic media and continuous liquid-feed systems, including aeroponics, drip irrigation and emitters, NFT, flood and drain, and deep water culture. How to use To correct deficiencies: 2 mL per liter. Repeat after 1 week if necessary. Routine feeding: follow the Advanced Nutrients feeding chart for your stage. Good to know Advanced Nutrients says it is compatible with pH Perfect and non-pH Perfect base nutrients and supplements, including other brands'.
$351.80 $281.44
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Flying Skull Flying Skull Cal Mag Extreme - 2.5 GAL
During bloom, plants really need calcium and magnesium. Although they're technically classified as micro-nutrients, calcium and magnesium are just as import to the success of your plants and yield as NPK. Flying Skull have also added Vitamin B1 and Iron to Cal-Mag eXtreme. Cal-Mag eXtreme can also be used as a leaf feed to correct leaf curl.
$79.95 $71.96
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Flying Skull Flying Skull Cal Mag Extreme - 5 GAL
The need for Calcium and Magnesium in bloom is great. While being classified as micro-nutrients, calcium and magnesium are just as important as NPK. We have added Iron and Vitamin B-1 to help magnesium’s role play with phosphorous. Flying Skull will always be trying to find better ways for the master gardener to better his crop and continue to manufacture only the finest formulations for plant growth and insect/fungus control. Use Cal-Mag eXtreme as a leaf feed to correct leaf curl. Leaf curl or leaf deformation can occur after an application of soil or foliar fed plant food, pesticide or fungicide. To do this, add Cal-Mag eXtreme to water until you have added 200 PPM/0.4 EC. Flush the growing media with Cal-Mag eXtreme until the runoff matches the EC/PPM of the flush. Add Z7 to the water before adding the Cal-Mag eXtreme. When feeding the soil make sure the EC / PPM of the fertilizer feed match the runoff from the pot. This is critically important to maintain the proper osmotic transfer of minerals and water into the roots. Use an EC/PPM meter to make the match.
$139.95 $125.96
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Flying Skull Flying Skull Cal Mag Extreme - 1 GAL
During bloom, plants really need calcium and magnesium. Although they're technically classified as micro-nutrients, calcium and magnesium are just as import to the success of your plants and yield as NPK. Flying Skull have also added Vitamin B1 and Iron to Cal-Mag eXtreme. Cal-Mag eXtreme can also be used as a leaf feed to correct leaf curl.
$34.95 $31.46
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Emerald Harvest Emerald Harvest Cal-Mag - 1 QT
Keep your plants productive and green with Cal-Mag, a calcium and magnesium supplement from Emerald Harvest®. Containing top-quality ingredients, Cal-Mag is designed to nourish crops with extra calcium and magnesium and create the right conditions for abundant flowering and a heavy yield. This is especially important when growing in some media, such as coco coir, but any garden can benefit. Use Cal-Mag as a supplement to a base nutrient series for guaranteed professional results.
$23.00 $20.70
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Emerald Harvest Emerald Harvest Cal-Mag - 1 Gal
Keep your plants productive and green with Cal-Mag, a calcium and magnesium supplement from Emerald Harvest®. Containing top-quality ingredients, Cal-Mag is designed to nourish crops with extra calcium and magnesium and create the right conditions for abundant flowering and a heavy yield. This is especially important when growing in some media, such as coco coir, but any garden can benefit. Use Cal-Mag as a supplement to a base nutrient series for guaranteed professional results.
$70.00 $56.00
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Emerald Harvest Emerald Harvest Cal-Mag, 2.5 gal
Cal-Mag: USE CAL-MAG SUPPLEMENT TO: Reduce the risk of calcium or magnesium deficiencies. Promote chlorophyll production in plants to keep them green and healthy vigorous. Activate enzymes in plants that help plants uptake nutrients. Keep your plants productive and green in any growing medium with this calcium-magnesium supplement. Containing top-quality ingredients, Cal-Mag is designed to nourish crops with extra calcium and magnesium and create the right conditions for abundant flowering and a heavy yield. This is especially important when growing in some media, such as coco coir, but any garden can benefit. Growers use calcium-magnesium supplements to correct nutritional deficiencies inherent to some popular growing media. Calcium supports growth and encourages plant development, while magnesium is essential for chlorophyll production, so the garden takes enough energy from light. Magnesium also helps to build the enzymes plants need to uptake nutrients. Emerald Harvest’s Cal-Mag also contains kelp, which is a rich, natural source of nutrients that can be beneficial for crops.
$130.00 $104.00
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