Calcium nitrate and Azomite for supporting mid-summer plant growth, fruiting, and flowering

Calcium nitrate and Azomite serve very different purposes in the garden, but both help plants remain healthy during the demands of summer.

One provides immediately available nutrients for active growth, while the other supplies a broad spectrum of trace minerals that support overall plant health over time.

Calcium Nitrate 
It is highly valued for promoting robust vegetative growth.  Supports strong plant structure and is a fast-acting fertilizer that provides two essential nutrients:

• Nitrogen (15.5%) – Promotes vigorous leafy growth and supports chlorophyll production, helping plants maintain their rich green color.
• Calcium (19%) – Strengthens cell walls, improves root development, and supports the formation of healthy flowers and fruit.

During summer, calcium nitrate is especially beneficial for:

• Tomatoes, peppers, eggplants, and squash to help reduce the risk of blossom-end rot, which is linked to inadequate calcium reaching developing fruit.
• Lettuce, spinach, and other leafy greens that benefit from steady nitrogen for continued growth.
• Fast-growing annual flowers that need a nutritional boost to keep blooming.

Keep in mind: Blossom-end rot isn't always caused by a lack of calcium in the soil. More often, it's the result of inconsistent watering that prevents the plant from moving calcium into the fruit. Consistent soil moisture is just as important as adequate calcium.

Azomite
Azomite is a natural volcanic rock dust mined in Utah, containing over 70 trace minerals. It is widely used as a soil re-mineralizer and organic fertilizer to improve root systems, crop yields, and plant health without burning foliage or altering soil pH.

• Iron
• Zinc
• Manganese
• Copper
• Boron
• Molybdenum

These trace elements support many plant processes, including enzyme activity, nutrient uptake, root development, and stress tolerance. Azomite is not a fertilizer in the traditional sense - it contains very little nitrogen, phosphorus, or potassium - but it helps replenish minerals that may be depleted in heavily cultivated soils.

Best Uses During Summer
Azomite can be applied around:

• Vegetable gardens
• Flower beds
• Trees and shrubs
• Lawns
• Container plants (according to label directions)

Because it releases minerals slowly, it's best viewed as a long-term soil amendment rather than a quick fix.

Can They Be Used Together?
Yes. Many gardeners use calcium nitrate to provide readily available nutrients during the growing season while applying Azomite to improve the soil's mineral diversity over time. Together, they can support healthy growth.

• Calcium nitrate provides a quick source of nitrogen and calcium to support leafy growth, strong cell walls, healthy roots, and fruit development.
• Azomite supplies a wide range of trace minerals that help build long-term soil health and support overall plant vigor.

How to Apply Calcium Nitrate
For vegetable gardens:

• Sprinkle 1–2 tablespoons around the base of each plant, keeping it about 3–6 inches away from the stem.
• Lightly work it into the top inch of soil if possible.
• Water thoroughly after application to help move the nutrients into the root zone.

For rows of vegetables:

• Apply about 1 pound per 100 square feet (or follow the product label), then water deeply.

When to apply:

• When plants begin active growth.
• Just before flowering or fruit set.
• Every 2–4 weeks during the growing season for heavy feeders like tomatoes, peppers, squash, cucumbers, and corn.

Avoid overapplying, as too much nitrogen can encourage lush foliage at the expense of flowers and fruit.

How to Apply Azomite
For garden beds:

• Spread 1–2 pounds per 100 square feet over the soil surface.
• Gently rake it into the top few inches of soil if possible.
• Water well after application.

Around established plants:

• Sprinkle a handful around the drip line (the area beneath the outer edge of the plant's canopy), then water thoroughly.

For containers:

• Mix 1–2 tablespoons per gallon of potting mix when planting, or lightly scratch a small amount into the surface of existing pots.

Because Azomite releases minerals gradually, one application per year is often enough, although some gardeners apply a light second application in midsummer.

Important Summer Tips

• Apply fertilizers during the coolest part of the day.
• Water before and after fertilizing if the soil is very dry.
• Never apply calcium nitrate to drought-stressed or wilted plants without watering first.
• Avoid fertilizing during periods of extreme heat (above 90–95°F) if plants are under significant stress.

Combined with consistent watering, proper mulching, and healthy soil, these products can contribute to stronger, more resilient plants throughout the summer growing season.