You totally can. You do have to do some research on the type of blade you need for the land you have.

Also keep in mind that although there are no moving parts or fuel. A scythe still takes maintenance. First you will want to hone the blade after about 5-10 minutes of use using a whetstone. Then you will eventually need to peen the blade with a hammer and anvil.

Also, it’s easier to mow grass with a scythe if the grass is a bit longer. And you may be asked to mow your grass more often if you live with an HOA or something similar. Last year I cut my grass twice after it got about 5 ft tall, which I timed to get better yields from my garden and fruit trees.