It need not be a big playground, it should be sufficient enough to have the space in the exterior either in the front or the back to play sometime with your kids. Well, but you should ensure that you do not let your kids get hurt because of the weeds that are grown in this area. Since your aim is not to attract others, you do not have to grow the grass in this area but at the same time you should ensure that your kids are not hurt. Hence is the reason, you should and must understand what best you could do in this situation so that kids do not fall down and you do not get an emergency call from home when you are in office attending some important meeting.
You could read how the weed control product could help remove all sorts of weeds that are grown in the barren land. Since you do not want to protect any other plants in this area as you want to treat it as a ground where no plants are required to be grown, you could definitely try the contact type of weed controls that would kill everything in the area it is sprayed. It would kill even the simple to complex weeds thus letting you relax at office without having to get panic each time you get a call from home.
You would already been suffering with lot of pressure, this level of pressure changing from time to time depending on the project you are working on, so why again take an additional tension of your kids getting hurt with weeds. You could have the website bookmarked so that each time you notice the weeds you could order the small volume of this product and have the premises clean from weeds.