Redwoods do tend to be tall, at least the old ones. One problem in making a redwood look tall in a photo is getting back far enough to get the whole tree in view. Other redwoods get in the way. If you get a view down a path that shows the whole tree, the scale is lost.
The Photomerge™ option in Adobe Photoshop Elements serves to stitch multiple images together into one. It usually works remarkably well, but sometimes it just doesn’t do the job. In those cases, the problem can often be solved by perspectively correcting the individual images before merging them.