Bloom City Cal Mag Plant Supplement with Micronutrients - Concentrated Calcium Fertilizer for Garden & Hydroponics - Calmag for Plants, Gallon (128 oz)

I noticed improvement in my plants as early as 1.5 weeks! I am very happy that I came across this to try! Hopefully we completely avoid blossom end rot this year !

a must for my tomatoes

This finally solved my problem of Blossom End Rot, but it took a few weeks.

I’ve been having problems with blossom end rot on tomatoes for years while using things like bone meal with mixed results started this years plants and started seeing problems developing luckily found this product after using for 3 applications over 1 1/2 weeks plants have completely turned around and are now thriving and no end rot and now have a whole lot more flowers appearing while this product must have what the plants needed it’s also more readily absorbed because it’s water based if your tomatoes are just soso get some highly recommend

I'm a professional horticulturist, with decades of growing all kinds of plants. Regular fertilizers usually don't contain much, or any, Calcium and Magnesium because it often binds with other nutrients. Calcium and Magnesium deficiency is common in potted plants, which deplete what is in the soil. During dry periods, tomatoes can get blossom-end rot from Calcium deficiency. Alternate Cal-Mag, maybe once every two weeks, with regular fertilizer and see the difference. Follow label directions. This is very helpful for plants in containers for long periods, like potted citrus, orchids, cacti and ornamentals.