Focus stacking is an excellent technique for creating ultra-sharp images with deep depth of field. This great video tutorial will show you how use focus stacking in your own landscape images.
Coming to you from Mark Denney, this excellent video tutorial will show you how to use focus stacking to create sharper landscape images. Normally, you might just close down your aperture more or use the hyperfocal distance. The problem with using a narrower aperture is that you will eventually start to run into issues with diffraction, which will rob your image of the very sharpness you're looking for. On the other hand, using the hyperfocal distance can be a very good compromise to get everything reasonably sharp, but if you really want to get everything in the image from foreground to background as sharp as possible, focus stacking is the best way to do it. It is not a particularly difficult technique either; check out the video above for the full rundown from Denney.
And if you really want to dive into landscape photography, check out "Photographing The World 1: Landscape Photography and Post-Processing with Elia Locardi," which is currently on sale, along with the rest of the Fstoppers library of tutorials!