Here are some professional tips from Mark on when and how best to fertilize your Kentucky bluegrass lawn in Utah. 

• Use Ammonium Sulfate 21-0-0 (pure nitrogen). Typically, phosphorus and potassium (the 2nd and 3rd numbers shown on a fertilizer bag) are usually good in Utah soil.
• Fertilize in the cooler growing months:
• end of March to green up the lawn
• May, Sept, November
• Skip the hot months June, July, August
• For winter: Apply ammonium sulfate 21-0-0 in November which will provide nutrients through the winter months.
• Starter fertilizer can be useful to kickstart growth for newly laid sod. However, when you order sod from Mark's Lawn and Garden Supply, the sod comes well fed, so no starter fertilizer is needed. Just keep the sod super squishy wet for 2 weeks, and it will take off for you.
• Pro Tip: Save yourself money. Ammonium sulfate is the cheapest bag of fertilizer you can find at garden centers and big box home improvement centers. So, there's no need to buy big expensive brands. For around $15-20 a bag, you'll have all you need to cover an average 3,000sf lawn. Some of the prices for fertilizer are super expensive and what you'll find on the bag is the 3 numbers are usually close to 21-0-0 (pure nitrogen) anyways. If you have problems finding Ammonium sulfate at a nursery or garden center, just order a bag online. Here is a helpful link.

Application Tips:

• Use a broadcast spreader on wheels and apply the fertilizer granules in long lines with slight overlap. If using a hand spreader, use same spreading method.
  
• Water in for 5 minutes after spreading

Weed control for Lawns

• Apply a weed pre-emergent in April and again in July to stunt the pesky airborne weed seedlings from germination in lawns or anywhere. It can also prevent crabgrass if applied early spring. This product can also control post-emergent crabgrass for up to 4 weeks.
• For broadleaf weeds that do end up appearing, simply apply a weed killer made for lawns. Effective weed killer ingredients to look for on the bottle are: Quinclorac, Dicamba, or 2-4-D.
• Pro Tip: Roundup FOR LAWNS: Or just take the guessing out of it and buy a great product I have used for years that kills most lawn weeds with great success. It's called Roundup FOR LAWNS. Just screw it onto your hose and spray the weeds in your lawn. Be careful not to overspray trees or shrubs. And be sure the bottle says FOR LAWNS on it or it will kill your lawn. You can simply buy it online using this quick helpful link.