Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, Quart (32 oz)
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Availability:
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Saturday, Jan 31
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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
Liquid Volume: 32 Fluid Ounces
Specific Uses For Product: Organic
Package Dimensions : 8.82 x 3.27 x 3.11 inches; 2 Pounds
Date First Available : July 17, 2017
Manufacturer : Bloom City
Best Sellers Rank: #3,970 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #139 in Garden Fertilizers
#139 in Garden Fertilizers:
Customer Reviews: 4.6 4.6 out of 5 stars (6,755)
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Jan 31
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)
I grow bell peppers and other types of peppers in my garden. Sometimes they need calcium and magnesium to fertilize them or they start getting the source fights on them. I decided to try this one to see if it would work. I use this and within a week, my plants perked up really well. The pepper started looking very nice and green and healthy. I’m very satisfied with this product. I would suggest this for anybody this fertilizer is good quality it’s effective and being organic makes it even better.
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Reviewed in the United States on September 18, 2025 by MikeyJay
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)
I initially got this for my raised garden tomatoes. When I noticed my bell pepper plants in growbags were experiencing end rot, I used this on them. Probably 2 doses in a month. From that point forward, it cured the end rot in the new bells. Seemed to act quick and I haven't had the need to add anymore this season. This was great to have on hand. Would order again.
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Reviewed in the United States on October 9, 2025 by W. Huber
Size: Quart (32 oz)
Works great
Reviewed in the United States on August 28, 2025 by timheinlein
Size: 1/2 Pint (8 oz)
Keeps those tomatoes from splitting or having root rot
Reviewed in the United States on December 14, 2025 by Lisa
Size: Quart (32 oz)
Great product I had the best tomatoes this years than ever before.got rid of all blossom rot
Reviewed in the United States on October 9, 2025 by Bill sickles
Size: Quart (32 oz)
I grow my tomatoes in pots and before using this I had blossom end rot even though I fertilized regularly with water solutions I still had this problem. Since I started using this with my fertilizer the problem went away. I use it all liquid fertilizers on a 10 day fertilizing schedule and I get a bumper crop of everything. A quart, for me lasts a season.
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Reviewed in the United States on October 3, 2025 by Kogabear
Size: Quart (32 oz)
Tomato garden report: I usually use Fox Farm Big Bloom and Tiger Bloom for my tomato garden with good results. This year, I added Cal Mag to the fertilizer blend and have had my best crop ever! Mid to late season, I always feel like the garden needs a little more nitrogen. This adds just enough. The cal mag part really does a lot to strengthen the fruit skin. Besides resisting pests in the garden, it makes it easy to slice or remove the skins when cooking the harvest. The red tomatoes are Granny Cantrell. This plant has produced over 50 lbs--so far. The yellow one is called Kellogg's Breakfast. It wasn't quite as productive, but the giant yellow globes have really impressed the neighbors.
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Reviewed in the United States on September 8, 2025 by Jim R. Baumgartner Jim R. Baumgartner