Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, Quart (32 oz)
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Availability:
In Stock.
Arrives
Sep 7 – Sep 16
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Size: Quart (32 oz)
Features
- Easy Mixing Directions: Simply add 2-5ml per gallon of feedwater, then water your plants as you normally would. A straightforward addition to your plant care routine, suited for all types of plants.
- Nutrient-Focused Formula: This Cal Mag fertilizer contains calcium and magnesium that plants use for maintaining strong stems and vibrant leaves. Suitable for both indoor and outdoor use.
- Adaptable for Different Growers: Whether tending to houseplants, outdoor gardens, or hydroponic setups, this CalMag for plants fits into a variety of growing conditions and plant care styles.
- Supports Plant Nutrition: Many gardeners turn to Cal Mag for plants to help address nutrient needs, aiming to support consistent growth and leaf color, linked to calcium and magnesium intake.
- Suitable for Growers of Any Skill Level: From beginners to experienced gardeners, this Cal Mag fertilizer is easy to integrate into any plant care routine, providing essential nutrients in an accessible format.
Brand: Bloom City
Item Weight: 32 Ounces
Item Form: Liquid
Coverage: Full
Liquid Volume: 32 Fluid Ounces
Package Dimensions : 8.98 x 3.35 x 3.23 inches; 2 Pounds
Date First Available : July 17, 2017
Manufacturer : Bloom City
Country of Origin : USA
Best Sellers Rank: #1,701 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #69 in Garden Fertilizers
#69 in Garden Fertilizers:
Customer Reviews: 4.6 4.6 out of 5 stars 6,526 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sep 7 – Sep 16
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: Quart (32 oz)
This is the only general micronutrient supplement I ever buy. I first got it when my younger plants started showing signs of nutrient deficiencies outside of NPK nutrients. My plants showed signs of recovery after one watering and a few foliar applications. Some people might not need it, especially if they are growing in properly enriched soil, but I have water that's softened at a municipal level. As a result, some minerals have been removed from my water; this product helps restore those and add others that are good for all plant growth stages, from new plants to blooming plants. Use is simple. Just measure out however much I want to add to my 2-gallon can, dump it in, add water, and water my plants as usual. No worrying about presoaking anything or lots of stirring to mix in powders. (for simplicity, I use a different fertilizer bottle's cap to measure out ~8ml when filling my watering can) The bottle cap/lid and recommended measurements have changed from the previous bottle I bought. The ingredients list is the same, as well as the concentration percentages of the minerals. They also separate the use guidelines/directions differently between them. I'll only mention the amount differences. New: watering can: 1tsp (2.5-5ml)/gallon Hose end sprayer: 1tsp (5ml) approx 1:750 ratio Foliar spray: 2-4tsp (10-20ml)/gallon Old: Grow phase: 2-4ml/gallon Bloom phase: 3-5ml/gallon Sprayer instructions: 20-40ml/gallon Not sure why they changed the amounts, but it's helpful to know the ratio for using with a hose end sprayer. Overall, great value for money in my opinion.
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Reviewed in the United States on June 12, 2025 by gage
Size: Quart (32 oz)
Got blossom end drop? This product is 100% needed to stop that from happening.
Reviewed in the United States on June 23, 2025 by Beverly Coffey
Size: Quart (32 oz)
I've only had it for a day. Just mixed up in a spray bottle and misted my whole garden. Very easy
Reviewed in the United States on June 15, 2025 by Betsy
Size: Quart (32 oz)
I grew about 10 tomatoes outdoors in 10 or 15 gallon fabric pots this year. I used a calcium rich fertilizer when I started the plants because I knew that nutrients wash away in pots and aren't replenished and calcium loss can cause blossom end rot. I have had it before. The foliage looked good but when they set fruit, almost all except cherry tomatoes showed end rot, some fairly serious. I assume the fertilizer wasn't concentrated enough or washed away to quickly, I bought the cal mag supplement, mixed it 15-20ml to a gallon water and sprayed it on the entire plants in the evening. I live in a hot dry location and was worried about burning the plants so tested it on one plant first. When it didn't burn that one I did the rest. I continued treat the plants, sparying in the evening, about once a week. The end rot did go away, I can't actually confirm the product did it. We had gone through a very hot spell well into the 90s most days and with 20% humidity when I first noticed the problem. The weather let up a bit at the same time I stopped seeing the end rot. I might have changed the watering a bit too. It's possible it would have gone away on it's own. But I continue to spay once a week, it hasn't come back, and we have had some hot days since. So it didn't hurt the plants and maybe it helped.
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Reviewed in the United States on August 20, 2024 by COLLINS Reuben
Size: Quart (32 oz)
Good
Reviewed in the United States on June 27, 2025 by Norman Nicholson
Size: Quart (32 oz)
I've used frequently almost daily. Best year I've had avoiding blossom rot on tomatoes. I'll be using it from now on.
Reviewed in the United States on June 12, 2025 by Paw Paw Dude
Size: Quart (32 oz)
good
Reviewed in the United States on June 23, 2025 by gmart
Size: Quart (32 oz)
I have several bell pepper plants in a large square container. They are way too close so I will have to thin them out even though they are producing peppers. Blossom end rot started on several of the larger bell peppers. After using Cal_Mag and some liquid fertilizer it appears the rot has stopped appearing on new peppers. This container had some of my best soil mixture: worm castings, kelp meal, pearlite and some good container soil. Probably the PH is still a little off also. My other in ground raised beds have plenty of home kitchen compost so those tomatoes are blemish free and one cherry tomato is about 8 foot long now.
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Reviewed in the United States on April 15, 2025 by Everglades