Fertilizing Your Lawn
Read the label of any product you use to ensure the proper amount of material is used. Too much may injure your lawn, too little may cause less than satisfactory results. Each time a lawn is fertilized one pound of nitrogen should be used for every 1,000 square feet.
To calculate how much granular fertilizer you will need to use, look at the fertilizer package. There should be three numbers like 16-16-16, 25-0-2 or something similar. These numbers represent the percentage of Nitrogen, Phosphorus and Potassium contained in the product. The first number represents the percentage of nitrogen in a pound of the fertilizer blend. Since you want 1 pound of actual Nitrogen, divide the first number by 100 which will give you the number of pounds product you will put down per 1,000 square feet of grass. (e.g. 16 ¸ 100 = 6.25 lbs. or 25 ¸ 100 = 4 lbs.).
How often should you fertilize? We recommend treating your lawn every six to eight weeks to maintain a healthy, green lawn. Your first treatment should be done in March or April and your last treatment should be performed mid-October to November for early spring green-up.

Billbug & Crane Fly
Damage from Billbugs and Crane Fly eating the roots of your lawn can be unsightly. The best way to defend against this damage is prevention. We recommend three treatments each season with a quality insecticide. Be sure to read the label and follow the application rates recommended. Under-applying can result in low or no control. Over-applying can lead to the insect building resistance to the insecticide. It is also recommended that you change the insecticide (active ingredient) you use for each treatment to prevent resistance to any one product. The best time to apply treatment is May through August approximately four to five weeks apart. Lawns with past insect damage tend to need treatment each year.

Weed Control Part I - Common Weeds in Eastern Washington
Controlling weeds is essential in maintaining a beautiful and inviting lawn. There are many products and it can be confusing what to use. For lawns, we recommend using products that can be sprayed in liquid form since they provide better coverage and results than granular. 2-4D products are effective, but should only be used a maximum of two treatments per year. Other non-2-4D products should be considered for any additional weed control treatments. We recommend treating your lawn with weed control every six to eight weeks to maintain a virtually weed-free lawn all season, encouraging your grass to grow strong without competing with the weeds.

Weed Control Part II - Common Grass Weeds in Eastern Washington
Crabgrass and Barnyard grass is best treated by using a pre-emergent early in the spring before it germinates. Two treatments of crabgrass pre-emergent six to eight weeks apart give even better control. Once Crabgrass is established, it is very difficult to control. Fortunately, it will die off at the end of the season giving you another chance the following season to put pre-emergent down before it germinates.
Quackgrass, Orchard grass, and Bermuda grass cannot be selectively controlled. Ridding your lawn of these types of grass will require a complete kill and reseeding. Bermuda grass is an extremely aggressive grass that may take repeated kills over an entire season.
There are some products that can help reduce Bentgrass and Poa Annua but will require multiple and consistent treatments. Your local garden store can help. Always read and follow the label instructions.