You should avoid fertilizing during drought stress, extreme heat (above 90°F), when grass is dormant, immediately before heavy rain, or when the lawn is diseased or newly seeded. Fertilizing at the wrong time wastes money at best and can seriously damage your lawn at worst. After 25 years of caring for Tulsa lawns, Complete Lawn Care has learned that timing is everything with fertilization. Our 7-step program applies the right nutrients at the right time for Oklahoma’s growing conditions.
During Drought Stress
When your lawn is drought-stressed (showing signs like wilting, blue-gray color, or footprints that don’t spring back), it’s in survival mode. Fertilizer encourages growth, but a stressed lawn can’t support new growth. Pushing it to grow when water is limited makes the stress worse and can burn the grass.
What to do instead: Focus on watering. Once the lawn recovers and is actively growing again, then fertilize.
During Extreme Heat
Oklahoma summers regularly hit 95-105°F. Fertilizing during these heat waves stresses grass that’s already struggling. The nitrogen in fertilizer promotes blade growth, which requires more water and energy than the plant can spare during extreme heat.
Safe temperature range: For warm-season grasses like Bermuda, fertilize when temperatures are consistently between 70-90°F. Avoid applications when highs exceed 95°F.
When Grass Is Dormant
Dormant grass isn’t actively growing or taking up nutrients. Fertilizing dormant Bermuda or Zoysia in winter is pointless because the grass can’t use the nutrients. The fertilizer either washes away (wasting money and potentially polluting waterways) or sits on the surface until spring.
For Bermuda/Zoysia: Don’t fertilize from November through March when grass is brown and dormant.
For Fescue: Don’t fertilize during summer (June-August) when Fescue goes semi-dormant from heat stress.
Before Heavy Rain
Light watering after fertilization helps activate the product. Heavy rain, however, washes fertilizer off your lawn and into storm drains before the grass can absorb it. This wastes your investment and contributes to water pollution.
Check the forecast: Avoid fertilizing if heavy rain (more than 1/2 inch) is expected within 24-48 hours.
When the Lawn Is Diseased
Fertilizing a diseased lawn often makes things worse. Many lawn diseases thrive when grass is pushed to grow quickly. The nitrogen in fertilizer can feed the disease as much as the grass, spreading the problem.
Treat the disease first: Identify and address the disease, then resume fertilization once the lawn is recovering.
On Newly Seeded or Sodded Lawns
New grass needs time to establish roots before heavy feeding. Too much nitrogen too soon produces weak, shallow-rooted grass that looks good briefly but struggles long-term.
For new seed: Use a starter fertilizer at planting, then wait 4-6 weeks before regular fertilization.
For new sod: Wait 3-4 weeks until roots establish before applying fertilizer.
Complete Lawn Care’s Approach to Fertilization Timing
For 25 years, Complete Lawn Care has refined our fertilization timing for Oklahoma’s unique conditions. Our 7-step program schedules applications when your grass can actually benefit from them, not on an arbitrary calendar. We monitor weather conditions and adjust timing as needed. This expertise comes from a quarter century of learning what works in Tulsa’s challenging climate. Let us take the guesswork out of lawn fertilization.
Contact Complete Lawn. Care:
Phone: (918) 605-4646 | Email: [email protected] | Online: completelawncaretulsa.com/get-a-quote