How to Start Grass on a Steep Slope

Test the pH of the soil. In order to grow and thrive, grass requires a pH between 6.0 and 7.0. If the soil is less than 6.0 it is acidic, and if it is over 7.0 it is alkaline. If the pH readings are not optimal, you will need to fertilize the soil first before you plant your grass seed to ensure that it will be able to grow.

Till up the slope. Simple broadcast seeding will not always work on a slope because of rain and its effect on top soil. It will be necessary to till this soil up so that it is more receptive to your grass seed. Set the tiller to go to a depth between 1 and 3 inches and go over the soil once to break it up. If the soil is still in clumps, re-till it until the soil is smooth and fine. Use caution if using a pull behind tiller on a slope. Go in diagonals, not straight up and down, for safety.

Fertilize the soil. Keep your soil's pH reading in mind when selecting fertilizer. Choose one intended to balance your particular soil. Spread the recommended amount on the package over your freshly tilled soil and let it sit for five to seven days before proceeding.

Broadcast the grass seed. Most steep slopes will require a ratio of 4 lbs. of grass seed per 1,000 square feet of ground. Use a seed broadcaster to distribute the seed evenly on your slope. These can be rented from most hardware or garden supply stores.

Water the freshly planted seeds lightly. Do not flood the area because it will wash away the seeds. Use a mist setting on a sprayer and lightly go over the entire area that you planted.

Cover the grass seed with a light layer of straw. This will help keep the seed in place and assist it in the germination process. The straw can be removed once the seedlings begin to poke through the soil.

Water the seed lightly every day until it takes hold. Once again, do not flood the area with water. A light mist is all that is needed. Once the seeds begin to sprout, you can switch to watering every two to three days or as needed.