I'm really frustrated with my backyard because it's so patchy, has over 10 types of grasses, and the grading is all over the place, leading to puddles after it rains. I want to completely redo it by grading the lawn, adding a small patio, and planting some quality grass seed. I found a company I'd like to hire for the regrading and patio work, but I need advice on how to prepare first. What's the best way to kill all the existing grass so it's gone before reseeding? I'm eager for any tips from those who have tackled similar projects. Thanks!
2 Answers
I just re-grassed a patch in southwest Ohio. If you’ve used a pre-emergent herbicide in the spring, wait until fall to spread new seeds. You should definitely kill the existing grass first. I spread a mix of compost and topsoil over the area, then used Pennington Smart Seed. I covered it with a permeable mesh to retain moisture and watered it almost every day. If you're thinking about summer planting, avoid it - it's too hot! Keep the seeds hydrated initially, and if you see bald spots, just add more seed. For a softer surface, Kentucky bluegrass sod could be a great option, but be ready to water it a lot.
Before you start, make sure to gauge how big your backyard is. It takes a lot of time and investment to get a great lawn. Oh, and don’t forget your location, since some grasses work better in warm climates versus cool ones. Just a heads-up!

Definitely make sure your patio installers clean up after themselves. You don't want leftover rocks or cement where your new grass is supposed to be!