If you’re growing acid-loving plants (like hydrangeas, blueberries, or azaleas), lowering soil pH can help. A simple approach is:

1. Test first: Use a pH test to see your starting point.
2. Choose an amendment: Granular elemental sulfur lowers pH gradually; ammonium sulfate adds nitrogen and can acidify more quickly. Acidic planting soils or ericaceous mixes are great for containers. Peat-based mixes can also lower pH in potting situations.
3. Apply per label: Spread evenly, water in, and avoid over-applying.
4. Retest in a few weeks: Adjust in small steps; soil type and climate affect results.

You’ll find soil acidifiers, low-pH planting soils, and container mixes in our Garden Center for pickup or delivery.

Acidic soil is simply soil with a pH below 7 on the pH scale. Many plants prefer slightly acidic conditions, while some (like blueberries, azaleas, and rhododendrons) thrive in lower ranges. pH influences nutrient availability, so getting it in the right range can support healthier growth.

• In-ground beds: You can lower pH over time with soil acidifiers that include elemental sulfur or ammonium sulfate.
• Containers and planting holes: Low-pH potting or planting mixes labeled for acid-loving plants offer a convenient start.
• Supportive amendments: Humic-acid products can aid nutrient uptake, though they’re not primary pH changers.

A quick pH test helps you pick the right product and amount for your garden.

Ericaceous means “for acid-loving plants.” Ericaceous potting or planting mixes are formulated with a lower pH to support plants like azaleas, rhododendrons, blueberries, and certain hydrangeas.

• How they differ: Your native garden soil may not be acidic; ericaceous mix is a bagged medium designed for lower pH.
• When to use it: It’s a convenient choice for containers or for backfilling planting holes.
• For entire garden beds: Consider using a soil acidifier to gradually adjust your native soil’s pH and retest as you go.

Both approaches can support acid-loving plants, but the best choice depends on whether you’re growing in containers or in the ground.

Visual clues can be mixed, so a pH test is the most reliable check. That said, some gardeners notice:

• Plant preferences: Acid-loving plants (blueberries, azaleas) growing well while neutral-preferring plants struggle.
• Leaf symptoms: Yellowing or poor growth on plants that prefer neutral to alkaline conditions (nutrient availability changes with pH).
• Hydrangea bloom color: Some hydrangeas may turn bluer in lower pH if aluminum is available, but bloom color depends on variety and other factors.

Tip: Confirm with a pH test before making changes. If pH is low and you need to raise it, use lime; if you need to lower it further for acid-loving plants, look for soil acidifiers and retest periodically.

Both can lower pH, but they work a bit differently.

• Elemental sulfur: Microbes convert it over time, so it’s a gradual, longer-term approach with no added nitrogen.
• Ammonium sulfate: Supplies nitrogen and can acidify more quickly, which can be helpful for feeding acid-loving plants. It may require more frequent monitoring.

How to choose: Let your pH test guide the decision. For steady, longer-term pH moves, sulfur can be useful; for feeding plus acidifying, ammonium sulfate is an option. Always follow label directions, apply modest amounts, water in, and retest to avoid overshooting your target pH.