- Yellowing of New Growth<\/a><\/li>
- Stunted Growth<\/a><\/li>
- Poor Root Development<\/a><\/li>
- Reduced Tiller Production<\/a><\/li>
- Delayed Spring Greenup<\/a><\/li>
- Increased Susceptibility to Disease<\/a><\/li>
- Poor Response to Nitrogen Fertilizer<\/a><\/li>
- FAQ About Sulfur Deficiency<\/a><\/li><\/ul> \t\t\t<\/div> \t\t<\/div><\/div>
Yellowing of New Growth<\/h2>
\u201cA lack of nitrogen can cause yellowing in new growth,\u201d says Brad Stokes, associate professor of horticulture at the University of Idaho Extension. A lack of \u201csulfur can also mimic this yellowing in young plants when it is not available in the soil profile.\u201d<\/p>
Sulfur can be considered the fourth macronutrient (alongside nitrogen, phosphorus, and potassium) for plant growth and development, Stokes adds. \u201cIt is a vital nutrient for the creation of amino acids, proteins, and chlorophyll production.\u201d<\/p>
So, when fresh grass blades appear pale, light green, or even yellow, it may be a sign of alkaline soil<\/a>. Since sulfur is vital for chlorophyll formation, new growth will show stress before the existing grass.<\/p>
To turn the pale grass blades back to green, you can lower the soil pH<\/a> by using elemental sulfur or synthetic sulfur (like iron sulfate or aluminum sulfate). But before applying a soil acidifier, you must first test your soil<\/a> to determine if its pH level is too alkaline and actually lacks sulfur.<\/p>
Pro Tip:<\/strong> Aim for a soil pH between 6 and 7 for ideal nutrient uptake, unless your soil is naturally alkaline. <\/em><\/p>
Naturally alkaline soils (common in sandy, arid regions of the Western U.S.) contain high levels of lime, giving them a natural pH of around 7.5 to 8.3. In alkaline soils, it\u2019s best to work <\/em>with<\/strong> your soil, planting grass that is well adapted to your area, rather than trying to make major adjustments with sulfur amendments.<\/em><\/p>
Stunted Growth<\/h2>
Without enough sulfur, your lawn can\u2019t convert nitrogen into proteins, leading to stunted growth. So, if your lawn doesn\u2019t seem to be growing, even during its active growing season, it may be suffering from sulfur deficiency. Your grass may appear short, thin, and weak.<\/p>
Apart from thinning spots and bare patches, you may also notice the following:<\/p>
- Dull or lifeless color:<\/strong> Your grass may lack its usual vibrancy.<\/li>
- Shallow root system:<\/strong> Grass roots less than 2 inches deep may struggle to absorb nutrients.<\/li>
- Slow to recover from foot traffic:<\/strong> Weak grass will be unable to bounce back quickly, even if you have one of the best grasses for high-traffic yards<\/a>.<\/li> <\/ul>
Using a sulfur fertilizer helps kickstart growth by improving photosynthesis efficiency and amino acid synthesis.<\/p>
Note:<\/strong> Research by the University of Tennessee states that a 15:1 nitrogen-to-sulfur (N:S) ratio<\/strong> is considered normal in turfgrasses with no nutrient deficiency, with sulfur levels typically ranging from 0.1% to 0.6%<\/strong>.<\/p>
See Related:<\/strong> When is the Best Time to Apply Sulfur to Your Lawn<\/a><\/p>
Poor Root Development<\/h2>
![\"Patchy](\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2025\/10\/bare-spots-grass.jpg\")
A patchy brown lawn could be a sign of poor root development. Photo Credit: Anna<\/a> \/ Adobe Stock<\/figcaption><\/figure> Stokes also mentions that, like nitrogen, a lack of sulfur can limit or stunt proper growth and development.<\/p>
If your lawn struggles to anchor itself, producing weak or shallow roots, sulfur deficiency may be the problem. With a poor root system, the grass will be easy to pull out. It can also cause the following:<\/p>
- Thin, dry, or patchy growth<\/li>
- An increase in weeds<\/li>
- Soil compaction<\/a><\/li>
- Standing water<\/li> <\/ul>
Grass roots are easily affected by nutrient imbalances, and sulfur plays a direct role in developing strong and deep root systems. Since it converts nitrogen into proteins necessary for strong root development, a lack of sulfur will cause excessive nitrogen to push top growth at the expense of a healthy root system.<\/p>
See Related:<\/strong><\/p>
- How to Fix Dry Patches on Your Lawn<\/a><\/li>
- 12 Ways to Get Rid of Standing Water in Your Yard<\/a><\/li> <\/ul>
Reduced Tiller Production<\/h2>
![\"Infographic](\"https:\/\/www.lawnstarter.com\/blog\/wp-content\/uploads\/2025\/10\/Grass-Tiller-infographic.jpg\")
Infographic by LawnStarter created using Gemini<\/figcaption><\/figure> Grass spreads primarily through rhizomes and stolons, but tillers are new grass shoots that increase the density and thickness of lawns.<\/p>
However, the grass won\u2019t be able to produce new shoots if the soil has insufficient sulfur levels (since it\u2019s essential for protein and chlorophyll synthesis).<\/p>
If your lawn is low in tillers, it will be thin, patchy, and less resilient to stress.<\/p>
Delayed Spring Greenup<\/h2>
The cold and wet soil conditions in early spring can make sulfur less available to the grass roots. Even if your soil is not sandy, winter rain or melting snow can wash out the sulfur.<\/p>
If your lawn is taking longer than usual to turn green in the spring, it may be a sign of sulfur deficiency. Sulfur helps kickstart grass growth after winter dormancy. And, without it, the transition of your lawn from dormant brown to vibrant green will be sluggish.<\/p>
Adding sulfur can help:<\/strong><\/p>
- \t\t\t\t\t\t\t \t\t\t\t\t
- 12 Ways to Get Rid of Standing Water in Your Yard<\/a><\/li> <\/ul>
- Standing water<\/li> <\/ul>
- Shallow root system:<\/strong> Grass roots less than 2 inches deep may struggle to absorb nutrients.<\/li>
- Stunted Growth<\/a><\/li>