The best flowering shrub blooms all summer because it flowers on new growth, so it keeps making fresh buds from June through frost. If you want that kind of color in a dry yard, your top drought tolerant picks are Russian sage, butterfly bush, blue mist shrub, and abelia. All four hold their bloom for months on very little water, and they thrive in the hot, lean spots where softer plants give up.
From my kitchen window in August, a haze of blue Russian sage runs along the dry slope by the gravel driveway. The whole patch hums with bees from morning until the light fades. I planted it on the worst, rockiest strip of soil I had, and it has flowered there for three straight summers with no watering at all once it took hold.
These plants belong to a small group of long blooming shrubs that thrive on neglect. They want lean ground and full sun, not rich beds or daily water. Give them a pampered spot and they sulk and flop. Give them a hot, dry slope and they bloom for months. You get more flowers by doing less for them, which is rare in a garden.
Here is why they flower so long. Each one sets its buds on new growth that pushes out the same year. So every fresh stem turns into a flower stem. The plant keeps making new wood all season, which means it keeps making fresh blooms right behind it. You are not waiting on last year's branches to perform, the way you do with lilac or forsythia.
That growth habit is also why pruning matters so much for you. A hard cut in late winter or early spring wakes up a rush of new shoots. More new shoots means more flowers. I cut my Russian sage back to about 8 inches every March, and it comes back fuller and blooms harder each year. Do not prune in fall, since those old stems shield the crown through winter.
Each one fills a slightly different spot in your garden. Russian sage stands about 3 to 4 feet tall and takes the most cold, down to zone 4. Butterfly bush is the giant of the group at 5 to 8 feet, and it pulls in clouds of pollinators all day. Blue mist shrub stays low and tidy near 2 to 3 feet, which suits a small bed. Abelia runs 3 to 6 feet and keeps flowering into fall, often the last shrub still in bloom.
I planted a butterfly bush at the back corner of my front bed five years ago, and it has earned that spot. By July you can count six or eight kinds of butterfly on it at once. I prune it to knee height each spring, and by August it is taller than I am and loaded with purple spikes. Pick a named, low-seed type so it stays put and does not spread into wild ground near you.
These rank among the most reliable summer flowering shrubs you can plant in a hot, dry yard. Set them in full sun and skip the rich compost, since lean soil keeps them sturdy and packed with bloom. Soft, well-fed plants grow leggy and flower less. A little hardship makes them tougher and prettier, so resist the urge to baby them.
Water deep but rarely while the roots settle in that first year. A long, slow soak once a week beats a daily splash, because it pulls roots down where the ground stays cool and damp. Once your shrubs are settled, rain and the odd deep drink carry them through the worst heat. You end up with months of bloom for almost no work, which is the whole point of going water-wise.
Read the full article: Drought Tolerant Shrubs: 15 Water-Wise Picks
