What Is the 5-Round Fertilization Program for North Texas?
North Texas warm-season grasses need 5 to 7 fertilization rounds per year for optimal health and appearance. The standard professional approach is a lawn fertilization program that covers the full growing season from early spring through late fall in 5 rounds. This is not about dumping nitrogen on your lawn every month — each round has a specific purpose and formulation. Round 1 (March): Spring wake-up. A balanced fertilizer with pre-emergent weed control applied as soil temperatures approach 55 degrees. This feeds the grass as it exits dormancy and prevents crabgrass and other warm-season weeds from germinating. Round 2 (May): Growth fuel. Higher nitrogen to support the rapid growth phase. This is when your lawn is growing most aggressively and needs the most nutrition. Round 3 (June-July): Summer sustain. A slow-release nitrogen formula that feeds through the hottest months without burning. Iron supplement included or applied separately. Round 4 (September): Fall recovery. Balanced fertilizer to help the lawn recover from summer stress and build energy reserves before dormancy. Round 5 (October-November): Winterizer. Potassium-heavy formula that strengthens roots and improves cold tolerance. This round sets up next spring's performance.
What Is the Bermuda Grass Fertilization Schedule?
Bermuda grass is the most common lawn grass in North Texas, and it is a heavy feeder during its active growing season. Bermuda goes dormant (turns brown) in late November and does not green up until late March or April, depending on temperatures. During its active season, it grows aggressively and responds well to nitrogen. March (as grass greens up): Apply 0.5 to 1 pound of nitrogen per 1,000 square feet using a balanced fertilizer (15-5-10 or similar). Combine with pre-emergent herbicide. Do not apply until the grass shows active green growth — fertilizing dormant Bermuda wastes product and feeds weeds instead. May: Apply 1 pound of nitrogen per 1,000 square feet. This is the primary growth feeding. Use a quick-release formula for fast response or slow-release for extended feeding. Late June or early July: Apply 0.5 to 1 pound of nitrogen per 1,000 square feet. Switch to slow-release to avoid burning in summer heat. Add supplemental iron if yellowing is present. September: Apply 1 pound of nitrogen per 1,000 square feet to support fall recovery and root development. October (4 to 6 weeks before first expected frost): Apply a winterizer formula high in potassium (such as a 10-0-20). Bermuda uses this round to store energy in its root system for winter survival and faster spring green-up. Total annual nitrogen for Bermuda in North Texas: 3 to 5 pounds per 1,000 square feet.
What Is the St. Augustine Grass Fertilization Schedule?
St. Augustine is the second most common grass in the DFW area and has different nutritional needs than Bermuda. It requires less nitrogen overall and is more sensitive to over-fertilization. St. Augustine is also more shade-tolerant, which is why you find it in yards with significant tree coverage. April (after full green-up): Apply 0.5 to 1 pound of nitrogen per 1,000 square feet. St. Augustine greens up later than Bermuda — do not rush this first application. Wait until the lawn is fully green and actively growing. Pre-emergent can be applied separately in February-March before the grass needs its first feeding. June: Apply 1 pound of nitrogen per 1,000 square feet using a slow-release formula. St. Augustine is susceptible to fertilizer burn, so slow-release is strongly preferred. August: Apply 0.5 to 1 pound of nitrogen per 1,000 square feet. Iron supplement is especially important for St. Augustine, which shows iron chlorosis (yellowing) more readily than Bermuda in alkaline North Texas soils. October: Apply a winterizer with higher potassium. Keep nitrogen at 0.5 pounds per 1,000 square feet maximum — pushing nitrogen in fall on St. Augustine promotes disease. Total annual nitrogen for St. Augustine in North Texas: 2 to 4 pounds per 1,000 square feet. The key difference from Bermuda: less nitrogen, fewer rounds, and more emphasis on slow-release formulas.
Why Does North Texas Soil Need Iron Supplements?
This is the single most overlooked aspect of North Texas lawn care. The soil across the DFW region is naturally alkaline, with pH levels typically ranging from 7.5 to 8.5. At these pH levels, iron in the soil becomes chemically unavailable to grass plants. The grass cannot absorb it even though it is technically present in the soil. The result is iron chlorosis — the grass blades turn yellow-green while the veins remain slightly darker. Many homeowners see this yellowing and assume the lawn needs more nitrogen, so they apply more fertilizer. This makes the problem worse: excess nitrogen pushes rapid growth that demands even more iron the plant cannot access, and the yellowing intensifies. The correct treatment is supplemental iron. Ferrous sulfate (also called iron sulfate) is the most common form. It can be applied as a granular product or dissolved in water and sprayed directly on the grass blades (foliar application). Foliar iron produces the fastest visual response — often within 24 to 48 hours. Chelated iron products are more expensive but remain available to the plant longer in alkaline soil conditions. Most professional lawn fertilization programs in North Texas include iron supplements in at least 2 of the 5 rounds, typically the summer applications when iron demand is highest.
What Is the Difference Between Organic and Synthetic Fertilizer?
This is a common question, and the honest answer is that both work in North Texas — each with tradeoffs. Synthetic (chemical) fertilizers deliver nutrients in precise ratios, work quickly (you can see results in 3 to 7 days), and cost less per application. The downsides: they do nothing for soil biology, they can burn grass if over-applied or applied before rain, and they contribute to salt buildup in already-alkaline North Texas soil over time. They also require more precise application — too much in one spot creates dark green streaks or burn patches. Organic fertilizers (composted manure, bone meal, blood meal, milorganite, corn gluten meal) release nutrients slowly as soil organisms break them down. They improve soil structure over time, support beneficial microbial activity, and carry almost zero risk of burning. The downsides: slower results (2 to 4 weeks to see impact), higher cost per application, and less precise nutrient ratios. They also require larger volumes of product per application. The practical approach: Many lawn care professionals in DFW use a hybrid strategy. Synthetic fertilizer for the primary nitrogen feedings in spring and summer when rapid response matters, and organic or slow-release products for fall and winterizer applications when slow, steady feeding is more appropriate. If you are maintaining your lawn yourself, milorganite (a widely available organic option) is nearly impossible to over-apply and works well as a baseline product for North Texas lawns.
What Are the Most Common Fertilization Mistakes?
Fertilizing too early in spring. Applying fertilizer before the grass is actively growing wastes product and feeds weeds instead. Wait until you see consistent green growth across the lawn before the first application. In North Texas, that is typically mid-March for Bermuda and April for St. Augustine. Applying too much nitrogen. More is not better. Excess nitrogen causes rapid blade growth at the expense of root development, increases thatch buildup, and makes the lawn more susceptible to disease and heat stress. Follow the label rates — they exist for a reason. Skipping the winterizer round. Many homeowners stop fertilizing after September because the grass is slowing down. The fall winterizer application is arguably the most important round of the year. It strengthens roots and stores energy for winter survival and spring green-up. Ignoring soil pH. Fertilizing an alkaline lawn without addressing iron availability is like filling a car with gas when the fuel line is blocked. A $15 soil test from your county extension office tells you your pH and nutrient levels so you can fertilize intelligently instead of guessing. Fertilizing before heavy rain. A light watering after fertilizing is good — it activates the product. A heavy downpour washes the fertilizer off the lawn and into storm drains, wasting your money and contributing to water pollution. Check the forecast before you apply. Using the wrong product for your grass type. Some weed-and-feed products contain herbicides that can damage St. Augustine (particularly those containing atrazine at high rates or 2,4-D). Always verify the product is labeled for your specific grass type.
How Do You Build an Annual Fertilization Program?
Here is a simple annual calendar you can follow for a North Texas lawn. February: Apply pre-emergent weed control before soil temperatures hit 55 degrees (usually late February in DFW). This prevents crabgrass and annual weeds. No fertilizer yet. March-April: First fertilizer application when grass is actively green. Pair with core aeration for maximum nutrient absorption. May: Primary nitrogen feeding. This is the growth engine for the season. June-July: Slow-release nitrogen plus iron supplement. Deep watering is critical during this period. August: Light nitrogen application with iron. St. Augustine gets its main summer feeding. September: Fall recovery fertilizer. Balanced formula. Pre-emergent for winter weeds (henbit, annual bluegrass). October-November: Winterizer application. High potassium, moderate nitrogen. This is the last feeding before dormancy. December-January: No fertilizer. Grass is dormant. Focus on leaf cleanup and reducing foot traffic on the lawn. Professional fertilization programs in the DFW area typically cost $49 to $100 per application, or $250 to $500 for a full 5-round annual program. This includes product, application, and adjustments based on your lawn's specific needs.
How Does Your Irrigation Schedule Affect Fertilizer Effectiveness?
Fertilizer that is not properly watered in will not reach the root zone and may actually burn your lawn in summer heat. Water activates granular fertilizer by dissolving the granules and carrying the nutrients down through the soil profile to the root zone. Apply water within 24 to 48 hours of any granular fertilizer application. A quarter-inch of water from either irrigation or rainfall is sufficient to activate most granular products. Do not apply granular fertilizer immediately before a heavy rainstorm that will wash fertilizer off the lawn and into drainage systems — this wastes the product and contributes to water quality issues in local waterways. Avoid fertilizing during drought stress. When your lawn is drought-stressed, its root system is compromised and cannot efficiently absorb nutrients. Fertilizing a stressed lawn often produces burn rather than growth. Always water deeply before applying fertilizer if your lawn is showing heat or drought stress. Early morning is the best time to fertilize because irrigation before application allows the product to dissolve throughout the day without the evaporation losses of midday applications. In North Texas's twice-per-week watering restriction environment, coordinate your fertilization day with your scheduled irrigation day so you do not need a separate watering run. Liquid fertilizer dries quickly in summer heat, so applying in the early morning or evening and watering lightly afterward optimizes uptake. The connection between irrigation scheduling and fertilization timing is something a professional fertilization program manages automatically, which is a practical advantage beyond mere convenience.
What Are the Visual Signs Your Lawn Is Ready for Its Next Fertilization Round?
Beyond following the calendar, your lawn gives you visual signals that tell you whether it is ahead of or behind schedule on its nutrition needs. Uniform light green to yellow-green color across the whole lawn (not patches) during the growing season indicates nitrogen deficiency. The grass is actively growing but running out of available nitrogen. This is the most common sign that a fertilization application is due. Slow growth rate relative to the season — if your Bermuda lawn is growing noticeably more slowly than surrounding yards in May or June, it is likely under-fertilized. A well-fed Bermuda lawn in DFW spring grows fast enough to require mowing every five to seven days. Increasing weed visibility as the season progresses can indicate that the turf is thinning due to inadequate nutrition, giving weeds competitive room. Yellowing with green veins (chlorotic leaf pattern) specifically indicates iron deficiency, not nitrogen deficiency — this is the alkaline soil issue common in DFW. Iron supplements or an iron-containing fertilizer formula is the correct response. Conversely, very dark green color with rapid top growth indicates over-fertilization, which depletes root reserves and increases thatch. A properly fed lawn shows medium green color, steady growth, and good density — not the dark blue-green of a lawn pushed with excess nitrogen. Understanding these visual signals lets you fine-tune your fertilization program beyond the calendar schedule to match your specific soil conditions and grass performance.
How Do You Choose a Professional Fertilization Service in the DFW Area?
Choosing the right fertilization provider determines whether your lawn receives a generic four-bag-a-year program or one actually tailored to North Texas soil and grass conditions. Ask if they conduct a soil test or lawn assessment before the first application. A provider who treats every lawn identically without knowing your soil pH, existing nutrient levels, or grass type is applying a one-size-fits-all approach that may not address your specific deficiencies. Ask what iron protocol they follow. Iron management is the most DFW-specific part of a fertilization program, and a company that does not address iron in alkaline soils is leaving a significant performance gap. Ask how many applications are included in the annual program. A 3-round program is generally insufficient for Bermuda or St. Augustine in North Texas — 5 rounds is the standard. Fewer applications mean nutrients run out between visits and the lawn cycles through boom-and-bust nutrition rather than steady, consistent feeding. Ask whether pre-emergent weed control is included and at which rounds — this is the most cost-effective add-on because it prevents weed problems that are far more expensive to address after emergence. Ask about their guarantee. A confident provider will revisit and retreat between scheduled visits if significant weed breakthrough or yellowing occurs. CARE provides complete fertilization programs for North Texas lawns tailored to Bermuda and St. Augustine, with iron management built into the summer rounds and pre-emergent timed to the DFW germination calendar.
Need professional help? Contact CARE for a free quote on fertilization programs tailored to your lawn and grass type.
Related: fertilization services • weed control • lawn aeration