What is the Best Calcium Fertilizer?

Written by Amir Tajer


Posted on October 15 2021

Calcium is classified as an essential nutrient, both for the vitality of plants and the structure of the soil in beds where they grow.

This means that it's critically important for plants to have access to a consistent supply of calcium throughout the growing season.

Here, we'll break down why calcium is so important and some of the ways you can ensure that your garden gets enough of it.

What Does Calcium Do for Plants?

Hand in soil

Calcium is a large component of the cellular structure of plants, so calcium deficiency can keep plants from growing as strong as they could — or bearing an optimal output of healthy produce.

And, as mentioned, calcium isn't just important for the plants, but also, the soil around them.

It provides critical structure to the soil, allowing water and nutrients to flow through it freely to the roots of the plants growing there.

Signs of Calcium Deficiency

Blossom end rot tomatoes calcium deficiency

There are a few signs that hint that your plants may not be getting enough calcium:

  • Death of the plant's growing points
  • Blossom and bud shedding
  • A disease that commonly affects apples, called bitter pit

Tomato growers will be familiar with another common consequence of insufficient calcium — blossom end rot.

When plants are afflicted with blossom end rot, the bottom of the fruit will form a large brown, rotten spot, effectively rendering it unusable for sale or consumption.

How a Calcium-Rich Fertilizer Can Help

If your plants are low in calcium, it's only logical that you'd look for a way to provide an increase in this important nutrient.

This is the primary role of a calcium-rich fertilizer. But there are several to choose from. How can you decide which one is best for your unique case?

Here are several factors that you'll find in a range of the highest quality calcium fertilizers:

Different Plants Have Different Needs

Different types of plants in different types of soil need different degrees of nutrient support. There are calcium fertilizers for tomatoes that may not be as effective for other plants.

For example, Greenway Biotech's Cal Mag fertilizer has a range of benefits for plants receiving an inconsistent supply of calcium, while our other fertilizers like Azomite and Dolomite are better for optimizing the nutrients in the soil earlier in the growing season.

A Diverse Array of Nutrients

Dolomite Fertilizer to raise soil pH 22% calcium 11.8% magnesium

In addition, a high-quality calcium fertilizer will offer a broader spectrum of nutrients.

Nutrient deficiencies in plants are often co-occurring — that is, plants that get insufficient calcium are also more likely to be low in other critical nutrients like magnesium.

Greenway Biotech sells calcium-rich Dolomite Fertilizer which provides a larger concentration of calcium in tandem with ammonium and nitrogen.

Different Concentrations for Different Needs

Not every calcium deficiency is as severe as the next, which is why you need a range of different products with different amounts of calcium in concentrations with other essential nutrients.

Greenway Biotech carries a range of calcium fertilizers, including:

- Cal Mag Plus 2-0-0 Concentrate, 3.2% calcium
- Calcium Nitrate 15.5.-0-0, 19% calcium
- Crustacean Meal 4-0-0, 12% calcium
- Azomite 0-0-0.2, 1.8% calcium
- Dolomite fertilizer, 22.7% calcium

To learn more and shop a wide variety of natural options to support the needs of every plant in your garden, explore our fertilizer collection or shop our calcium-rich fertilizers below!



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