Funny thing, I have about 30 palm seedlings just growing along the side of my driveway, looks like someone came a long and just dropped a seed every couple inches, right next to the drive way. This is what I have done today. I tried pulling the first six but I have a feeling they will be back. I happen to have concentrated round up, so not to hit anything else using the spray method, I poured a little in a container and added a drop of dawn dish soap (I have heard dish soap makes things stick to the culprit), I soaked a cloth and saturated the palm sprout. I will now keep a close eye on the spouts and see what happens and I will continue to repeat the above process for a while to see what happens.