You thought there was only one type of lawn seeds… You must review your current knowledge! If you use seed grains that are appropriated to warmer regions where climate is temperate, you will never have good results. You have to choose seed appropriated to your environment.
You should be cutting your grass at least two times a week. If you cannot do it frequently, cut your green space every week at least. Grass will be denser. Further, a regular cutting reduces weeds proliferation.
Watering heavily your grass (late afternoon or overnight – following your municipality law) and not frequently is better, you’ll make it easier for underground roots to grow. Further, if grass is watered too much, lawn will be weakened and more vulnerable when dry day will come.
Your lawn needs efficient fertilizer. Use appropriate fertilizer for your type of lawn, at spring or/and fall. This feeding will give strength to your lawn while allowing it to maintain its appearance. Water immediately and generously after each fertilization.
Aerate with an aerator at least once a year (at spring). Spikes will sink into the ground allowing lawn to receive a sufficient quantity of air.
For lawn over 2 years, use a scarifier or a scarification blade on your lawn mower in order to eliminate dead lawn that lies on the ground. Do it every year and grass will grow faster. After this operation is done, rake to remove residue.
If you want to, you can use fertilizer with an herbicide that attacks these undesirables. You will also find selective products that only attack to dandelions, clovers or quackgrass for instance.
An insecticide will help you to get rid of ants leaving little mounds of earth. Therefore, they are not dangerous for your grass. You will also need insecticide to get rid of true bugs or white worms.
Having a domestic animal is nice but it’s an undesirable on your grass… Animal urine is particularly damaging. If your pet relieves itself on the grass, pour over enough water to dilute this high-ammonia liquid.
Get rid of rodents. They have a bad habit: de-rooting blade of grass, making it yellow.