How to Balance pH for Magnolia: A Step-by-Step Guide

Magnolias are beautiful flowering trees that require slightly acidic soil to thrive. The ideal pH range for magnolias is between 5.0 and 6.5. If your soil pH is too high or too low, it can lead to nutrient deficiencies and poor growth. In this article, we will guide you through the process of balancing the pH for your magnolia tree.

Step 1: Test the Soil pH

The first step in balancing the pH for your magnolia is to test the current soil pH. You can use a home testing kit or send a soil sample to your local extension service. To collect a soil sample, follow these steps:

  1. Use a clean trowel or spade to dig a hole 6 inches deep near the base of your magnolia tree.
  2. Remove a slice of soil from the side of the hole and place it in a clean bucket.
  3. Repeat this process in several locations around the tree to get a representative sample.
  4. Mix the soil in the bucket thoroughly and remove any debris, such as rocks or roots.
  5. Take a small amount of soil (about 1 cup) and place it in a plastic bag or container.
  6. Label the bag or container with the date and location of the sample.
  7. Send the sample to your local extension service or follow the instructions on your home testing kit.

Step 2: Adjust the Soil pH

magnoliaImage source: Pixabay

Once you have determined the current soil pH, you can take steps to adjust it if necessary. If your soil pH is above 7.0, you will need to lower it to the ideal range for magnolias (5.0-6.5). To lower the pH, you can use elemental sulfur or a sulfur-containing product. The amount of sulfur needed will depend on the current pH and the desired pH. A general rule of thumb is to add 1 pound of sulfur per 100 square feet for every point you want to lower the pH. For example, if your soil pH is 7.5 and you want to lower it to 6.5, you would need to add 5 pounds of sulfur per 100 square feet.

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Here are the steps to follow when applying sulfur to your magnolia tree:

  1. Calculate the amount of sulfur needed based on the size of the area you want to treat and the current and desired pH levels.
  2. Put on gloves and a dust mask to protect yourself from the sulfur.
  3. Spread the sulfur evenly over the soil surface around the base of the magnolia tree, extending out to the drip line (the edge of the tree’s canopy).
  4. Use a rototiller or shovel to incorporate the sulfur into the top 6 inches of soil.
  5. Water the area thoroughly to help the sulfur begin to react with the soil.

Step 3: Wait and Re-test

After applying the sulfur, you will need to wait several months for it to take effect. The pH will not change immediately, so be patient. The speed at which the pH changes will depend on several factors, including the type of soil, the amount of rainfall, and the temperature. In general, it takes about 1-2 pounds of sulfur per 100 square feet to lower the pH by one point, and it may take several months to a year for the full effect to be realized.

After 3-4 months, re-test the soil pH to see if it has reached the desired level. If the pH is still too high, you may need to apply additional sulfur. If the pH is within the ideal range, you can move on to the next step.

Step 4: Maintain the Soil pH

magnolia 2Image source: Pixabay

Once you have achieved the ideal soil pH for your magnolia, it is important to maintain it over time. To do this, you can use a slow-release organic fertilizer with a pH between 5-7. Look for fertilizers that contain ingredients such as cottonseed meal, bone meal, or blood meal, which are acidic and will help to maintain the pH level.

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In addition to using an acidic fertilizer, you should also ensure that your magnolia tree has adequate drainage. Magnolias do not like to sit in waterlogged soil, which can lead to root rot and other problems. If your soil is heavy or clay-like, you may need to amend it with organic matter such as compost or peat moss to improve drainage.

Finally, be sure to water your magnolia regularly, especially during dry spells. Magnolias prefer moist but not soggy soil, so aim to keep the soil evenly moist but not waterlogged. A good rule of thumb is to water deeply and infrequently, allowing the top inch of soil to dry out between waterings.

Home Remedies for Balancing Magnolia pH

In addition to using sulfur and acidic fertilizers, there are several home remedies you can use to help balance the pH for your magnolia tree. Here are a few options:

  • Coffee Grounds: Coffee grounds are acidic and can help to lower the soil pH. Simply sprinkle used coffee grounds around the base of your magnolia tree and work them into the top inch of soil. Use about 1 cup of coffee grounds per 10 square feet of soil.

  • Pine Needles: Pine needles are also acidic and can help to lower the soil pH. Collect fallen pine needles and spread them around the base of your magnolia tree, extending out to the drip line. Use a layer about 2-3 inches deep.

  • Vinegar: Vinegar is a mild acid that can help to lower the soil pH. Mix 1 cup of white vinegar with 1 gallon of water and use it to water your magnolia tree. Repeat this process once a month during the growing season.

  • Peat Moss: Peat moss is acidic and can help to lower the soil pH while also improving drainage. Mix 1 part peat moss with 2 parts soil and use it to amend the soil around your magnolia tree. Work the mixture into the top 6-8 inches of soil.

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When using home remedies to balance the pH for your magnolia, be sure to use them in moderation and monitor the soil pH regularly. Over-acidifying the soil can be just as harmful as having a pH that is too high.


Balancing the pH for your magnolia tree is an important part of ensuring its health and vitality. By testing the soil pH, adjusting it if necessary, and maintaining it over time, you can create the ideal growing conditions for your magnolia. Whether you choose to use sulfur, acidic fertilizers, or home remedies, be sure to monitor the soil pH regularly and make adjustments as needed. With proper care and attention, your magnolia tree will thrive and provide you with beautiful blooms for years to come.


  1. Magnolia Flowers – Growing Tips, Care & Maintenance
  2. pH Balancing in Magnolia, TX – The Woodlands – Lawn Doctor
  3. Feeding magnolias: how and when to do it – Plantura Magazin
  4. How to adjust the soil ph before planting a magnolia – Ask Extension
  5. Plant Health Care Recommendations for Southern Magnolia