I hate to admit this, but I'm not the best gardener there is and I did a pretty stupid thing. Around my landscape area I was having a big weed problem so I went around and sprayed this area with Round-up, including near the base of the crape myrtle I have that's about 3 years old. I planted it when it basically was nothing but a stem and it has been growing very well up until this point. I noticed the leaves are turning brown and it seems it is dying rather quickly. Is there anything I can do to save my crape myrtle?