While you don't want to grab a hose and start watering which can cause foliage loss, spritzing the completed wreath with water from a spray bottle every other day or so will help to keep it moist and fragrant, especially in warmer climates. Remember to spray the back the back of the wreath to moisten the cut stems of the boughs. If your wreath is looking parched and droopy, soak it, cut branches side down, in a few inches of water (a bathtub works great) until it perks-up.