We tried traditional raised beds and they were so far away from where we like to hang out in the yard, that we looked for something that looked better, but was large enough to retain water well in 100 degree dry weather. A local grocery store had a crazy good deal on half wine barrels so we tried a dozen and they are ideal for us. They can also be stacked in pyramids if the wood is in good condition, although 4 high might be a row too high. We have a 3-high stack with flowers right next to the deck and visitors seem to like it better than anything else.
Getting water in these is really easy - just run a 1/2” plastic line into the bottom or side of each one and up to the surface. Then branch off drip lines however you like. Going in over the top never seems to work or look quite right.