Question
Aspen are spreading all over the front lawn at 5400ft. Is there a way to stop them from coming up without killing the few larger ones in the corner of the property?

Answer
Unfortunately, controlling root sprouts will be an ongoing, but ultimately futile task. Grubbing them is a short-term solution, but the sprouts will come back. Most people simply mow them regularly to keep them under control. In beds, mowing may not be an option and grubbing may be your only choice. Herbicides that will kill the root sprouts will greatly harm and likely kill the "mother" tree as well.

There are some growth hormones that will stop or slow the growth of these sprouts. One of these is called Sucker-Stopper a ready to use product. You might check with your local nursery/ garden type store for this product. Here is a link to information on Sucker- Stopper.

http://www.montereylawngarden.com/pdf/sucker_stopper_rtu02.pdf