Dolomite 0-5mm - pH Up - Plant Immune Boost

TerraSoil Dolomite (0–5 mm) is best used when soil is too acidic or lacking calcium and magnesium. Always test soil pH before application for best results.

Garden beds & open ground

• Apply 150–300 g per m², depending on soil acidity

• Incorporate into the top 15–20 cm of soil

• Apply several weeks before planting for best pH stabilisation

Containers & potting mixes

• Mix 2–5 g per litre of soil into the base mix

• Best applied before planting or during soil preparation

• Avoid repeated applications in small pots without pH testing

Best timing

• Autumn or early spring

• Allows slow pH adjustment and mineral availability before peak growth

⚠️ Dolomite works gradually, it is not an instant fix.

SiO2: 7.4-7.5%

CaO: 30-32%

MgO: 20-22%

pH: 7 - 8.5

These values reflect dolomite’s ability to buffer acidic soils and supply essential secondary nutrients.

✔️ Safely raises soil pH in acidic conditions ✔️ Supplies calcium for root strength & cell structure ✔️ Supplies magnesium for chlorophyll & photosynthesis ✔️ Improves nutrient uptake and fertiliser efficiency ✔️ Fine 0–5 mm grade ensures even soil distribution

Ideal for organic gardeners seeking long-term soil balance, not quick chemical correction.

• Helps correct soil acidity and stabilizes pH for sensitive crops.

• Supplies calcium & magnesium, critical for cell wall formation, photosynthesis, and stress tolerance.

• Improves cation exchange capacity (CEC) indirectly by stabilizing soil chemistry.

• Supports microbial and root health by creating a more hospitable chemical environment.

Can I use dolomite right before planting? It’s best applied several weeks before planting, as dolomite works gradually. Emergency use is possible in mild cases, but soil testing is recommended.

Can I use this in containers? Yes, but only in measured amounts and ideally before planting. Overuse in small pots can raise pH too much.

Is dolomite a fertiliser? No, it is a soil conditioner that improves pH balance and supplies calcium and magnesium.

Should I use dolomite every season? No. Apply only when soil pH or mineral levels indicate a need.

• ✅ Fine 0.5 mm dolomite for effective soil integration

• ✅ Supplies calcium & magnesium

• ✅ Gradual, safe pH adjustment

• ✅ Improves soil structure & buffering

• ✅ Long-lasting and natural

1. Your Soil Is Too Acidic

Before using dolomite, always test your soil pH.

• If soil pH is below ~6.0, dolomite can help move it toward neutral.

• Most vegetables, herbs, and ornamentals prefer a pH range around 6.0–7.0 for optimal nutrient uptake.

👉 Soil testing kits are inexpensive, and lab tests are even more accurate.

2. Your Soil Lacks Calcium or Magnesium

If a soil test shows low calcium and/or low magnesium, dolomite is a dual-purpose amendment, it adjusts pH and adds these nutrients at the same time.

3. Before Major Planting or Soil Preparation

Dolomite works slowly and needs time to react in the soil, often weeks to months, so the best time to apply is when preparing a bed before planting, especially in spring or fall.

Applying in fall gives it time to interact with soil over winter before plants emerge.

Do not add dolomite just because you think soil needs it. It should only be used when either:

✔ Soil pH is too low ✔ Calcium and/or magnesium are deficient

Because dolomite can raise pH, it should not be used on soils that are already neutral or alkaline (pH ≥ 7), as this can make certain nutrients less available and stress plants.

Also avoid on soils for plants that prefer acidic conditions (e.g., blueberries, azaleas, rhododendrons, strawberries).