Strong and healthy plants always start with healthy soil. In gardening and farming, many common plant problems are not caused by insects or diseases but by poor soil balance, especially incorrect pH levels and lack of essential minerals. When soil becomes too acidic, plants struggle to absorb nutrients, even if fertilizers are applied regularly.
In this review, I will share my real experience using Organic Dolomite Lime 5LB by Cz Garden Supply, explain how it works, and discuss why it is an important soil amendment for organic gardeners, especially those growing tomatoes and peppers.
What Is Organic Dolomite Lime?
Organic Dolomite Lime is a natural mineral soil amendment made from finely ground dolomitic limestone. It contains two essential plant nutrients: calcium (Ca) and magnesium (Mg). These minerals are critical for plant structure, nutrient uptake, photosynthesis, and overall growth.
Unlike regular agricultural lime that mainly supplies calcium, dolomite lime provides both calcium and magnesium, making it especially useful for soils that are acidic and magnesium-deficient. It works by slowly neutralizing soil acidity and raising the pH to a healthier range for plant growth.
The Cz Garden Supply Organic Dolomite Lime is OMRI listed, which means it can be used in certified organic farming under USDA National Organic Program guidelines.
This product comes as a 5-pound resealable pouch, which is convenient for home gardeners and small-scale growers. The lime is processed into an ultra-fine powder, not pellets or coarse granules. This fine texture allows it to react faster in the soil, especially when watered in. Here are some key product details
- Brand: Cz Garden Supply
- Item Weight: 5 Pounds
- Form: Ultra-fine powder
- Country of Origin: USA
- Certification: OMRI Listed (2024)
- Primary Nutrients: Calcium and Magnesium
- Best Uses: Vegetables, flowers, container gardens, Earthboxes, lawns, worm composting
The packaging is strong and resealable, which helps with long-term storage. You can pour only what you need and keep the rest without moisture damage or spillage.
Pros & Cons of Cz Garden Organic Dolomite Fertilizer
| Pros | Cons |
|---|---|
 OMRI listed and approved for organic farming |
 Powder can be dusty during application |
| Supplies essential calcium and magnesium |
Overuse may raise pH too much if not measured |
| Raises and stabilizes acidic soil pH |
Requires watering for faster activation |
| Ultra-fine powder reacts faster than pellets |
Not a complete fertilizer (no NPK) |
| Effective in preventing and curing blossom end rot |
Needs soil testing for precise application |
| Made in the USA with high-quality ingredients |
Not ideal for already alkaline soils |
Why Organic Dolomite Soil Fertilizer Matters?
Soil pH plays a critical role in how plants absorb nutrients. Even if your soil contains nutrients, plants cannot use them properly if the pH is too low or too high. Many garden soils, especially those amended with peat moss or composted organic matter, tend to become acidic over time.
Acidic soils often lead to calcium and magnesium deficiencies, which cause problems like weak cell walls, poor root growth, yellowing leaves, and fruit disorders such as blossom end rot.
This is where dolomite lime becomes important. It corrects soil pH and replenishes essential minerals at the same time.
Dolomite lime works through a chemical reaction known as neutralization. When applied to acidic soil, calcium carbonate and magnesium carbonate react with hydrogen ions in the soil. This reaction reduces acidity and gradually raises soil pH.
Calcium strengthens plant cell walls and improves root development. Magnesium is a core component of chlorophyll, which is responsible for photosynthesis. Without magnesium, plants cannot produce enough energy to grow.
Scientific studies show that most vegetables grow best in soil with a pH range of 6.0 to 6.8. Tomatoes, peppers, cucumbers, beans, and leafy greens all benefit from balanced pH and adequate calcium availability. Some statistical trends & supporting research and latest facts & figures are here:
Recent agricultural research highlights the importance of calcium and magnesium in crop productivity:
According to USDA soil surveys, over 40% of garden soils in North America are moderately to strongly acidic, especially in regions with high rainfall.
Studies show that calcium deficiency is responsible for up to 70% of blossom end rot cases in tomatoes and peppers.
Research published in soil science journals indicates that proper liming can increase nutrient uptake efficiency by 20–35%.
OMRI-listed soil amendments are increasingly popular, with organic gardening product demand growing at 8–10% annually worldwide.
Container gardening and raised beds, which often rely on peat-based mixes, show faster pH decline, making dolomite lime especially important for these systems.
My Experience with Cz Garden Supply Dolomite Lime
I have used Cz Garden Supply Organic Dolomite Lime for more than one season. My soil tends to be acidic due to regular use of peat moss and organic compost. I mainly grow tomatoes, peppers, leafy greens, flowers, and some indoor plants.
In one season, I noticed severe blossom end rot on my tomato plants grown in containers. I had added compost, bone meal, and balanced fertilizer, yet the problem continued. Without waiting for soil test results, I applied this dolomite lime in powder form and watered it thoroughly.
The results were surprisingly fast. Within days, new fruits developed without signs of rot. The plants looked healthier, leaves became darker green, and overall growth improved significantly.
I also use this lime in my worm composting system. Worms need calcium for digestion and reproduction, and this product helped stabilize the bedding environment. The worms appeared more active, and compost quality improved.
Performance of Cz Garden Supply Organic Soil Fertilizer
In terms of performance, this product delivers exactly what it promises. Because it is in powder form, it reacts faster than pelletized lime. When watered in properly, it begins working almost immediately in container gardens.
For tomatoes and peppers, it significantly reduced blossom end rot and improved fruit quality. For leafy greens, it enhanced leaf color and growth consistency. In flowers, stem strength and bloom quality improved.
The lime does not burn plants when used correctly, and it blends easily into soil mixes. It works well in raised beds, pots, Earthboxes, and even indoor plant setups.
Practical Tips for Cz Garden Supply Organic Fertilizer
For most container plants, 1–2 tablespoons per gallon of soil is sufficient. For garden beds, follow soil test recommendations whenever possible.
- Always apply dolomite lime before heavy watering for faster absorption.
- Use smaller amounts in containers and increase gradually if needed.
- Avoid applying to alkaline soils without testing.
- Mix well into the topsoil for uniform distribution.
- Wear a mask during application to avoid inhaling dust.
- Combine with organic fertilizers for best results.
Comparisons with Alternatives Soil Fertilizer
| mendment | How It Compares |
|---|---|
| Dolomite Lime | Provides both calcium and magnesium while raising and stabilizing soil pH. |
| Regular Agricultural Lime | Supplies calcium but does not provide magnesium. |
| Gypsum | Supplies calcium but does not affect or correct soil pH. |
| Epsom Salt | Supplies magnesium but does not correct soil acidity. |
| Pelletized Lime | Easier to apply but reacts slower compared to ultra-fine powdered lime. |
| Organic Compost | Improves soil structure and biology but cannot correct soil pH quickly. |
Final Recommendations
Organic Dolomite Lime 5LB by Cz Garden Supply is a must-have soil amendment for organic gardeners, container growers, and vegetable farmers. It is reliable, fast-acting, and made with high-quality natural ingredients.
If you struggle with acidic soil, calcium deficiency, or blossom end rot, this product is a practical and affordable solution. Its OMRI certification adds confidence for organic use, and the resealable packaging makes it convenient for long-term storage.
Based on experience and results, this dolomite lime is a long-term staple in any serious organic gardening setup.
