How to Balance pH for Sneezeweed

Balancing the pH for sneezeweed (Helenium species) is crucial for the plant’s optimal growth and health. Sneezeweed thrives in slightly acidic soil with a pH range of 5.5 to 7.0. If your soil is too alkaline, you can amend it with acidic enhancers to create the ideal growing conditions for this vibrant, drought-tolerant perennial.

Soil pH Testing

The first step in balancing the pH for sneezeweed is to test your soil’s pH level. You can purchase a soil testing kit from a garden center or online retailer. Follow the instructions on the kit to collect a soil sample and determine the current pH level.

Acidic Soil Amendments

sneezeweedImage source: Pixabay

If your soil test reveals a pH that is too high (alkaline), you’ll need to add an acidic enhancer to lower the pH. Some effective options include:

  1. Elemental Sulfur: Elemental sulfur is a natural mineral that can lower soil pH over time. Follow the application rate recommended on the product label.

  2. Aluminum Sulfate: This chemical compound can quickly lower soil pH, but it should be used with caution as it can be harmful to plants in high concentrations.

  3. Sulfur-Containing Fertilizers: Fertilizers that contain sulfur, such as ammonium sulfate or sulfate of potash, can also help acidify the soil.

When applying any of these acidic enhancers, be sure to follow the instructions carefully and water the soil thoroughly after application. It may take several applications over time to achieve the desired pH level.

Monitoring and Retesting

After applying the acidic enhancer, wait a few weeks and then retest the soil pH. This will allow you to determine if additional applications are needed to reach the target pH range of 5.5 to 7.0 for optimal sneezeweed growth.

See also  How to Balance the pH for a Royal Fern

Plant Growth Regulators (PGRs)

sneezeweed 2Image source: Pixabay

In addition to balancing the soil pH, the use of plant growth regulators (PGRs) can also benefit sneezeweed during the plug production stage. Ancymidol, the active ingredient in Abide and A-Rest, can effectively control excessive stretch in sneezeweed plugs.

To use PGRs, apply a 5,000 ppm spray of Dazide / B-Nine after the plant has established for two weeks following transplanting.

Sneezeweed Planting and Care

When growing sneezeweed from seed, it’s important to provide the right growing conditions. Sneezeweed prefers full sun and well-drained soil. Sow the seeds directly in the garden after the last spring frost or start them indoors six to eight weeks before the last frost date. Keep the soil consistently moist but not waterlogged.

Here are some additional tips for growing sneezeweed:

  • Provide Plenty of Space: Sneezeweed can grow up to 4 feet tall and 2 feet wide, so give it ample room to spread.
  • Deadhead Spent Flowers: Regularly deadhead spent flowers to encourage more blooms.
  • Stake Tall Varieties: Taller varieties may require staking to prevent them from falling over.
  • Divide Every Few Years: Divide sneezeweed every three to four years to prevent overcrowding and promote healthy growth.

By following these steps to balance the pH and provide the right growing conditions, you can successfully cultivate vibrant, healthy sneezeweed in your garden.


  1. Helenium Species Information
  2. Growing Helenium: Tips for Planting and Care
  3. Annuals PGR Guide