A hydrangea for all time!
'Annabelle' smooth hydrangea (H. arborescens) is a true garden classic that combines beauty with a storied past. Discovered in 1960 growing near a horse path in southern Illinois by University of Illinois horticulture professor Dr. Joe McDaniel, it has since become one of the most widely-planted and beloved garden plants. 'Annabelle' hydrangea is essentially a mophead version of the North American smooth hydrangea, with big, full, round flowers. They begin white and age to green, and are nice to enjoy as cuts both fresh and dried. For all its good qualities, 'Annabelle' does have very weak stems, which cause it to flop over after a heavy rain storm or wind. For an improved variety with stronger, sturdier stems and virtually no flopping, choose Incrediball hydrangea instead.
What makes 'Annabelle' different from other smooth hydrangeas?
- Interesting back story; an heirloom plant for the ages
- The first mophead hydrangea of its kind
Name: Hydrangea arborescens 'Annabelle'
Hardiness: USDA zones 3-8
Height + width: 3-4' x 5-6'
Light: Full to part sun
Soil: Any well-drained soil will do. Though dry conditions are unlikely to harm an established plant, prolonged drought will severely limit floral life.
Pruning: Blooms on new wood; prune back by one-third in late winter/early spring for better habit and a slight improvement in stem strength.
Water: Average water needs. Does not tolerate wet conditions.
Fertilizer: Fertilize once in early spring with a rose fertilizer if desired.
Bloom time: Early summer
Bloom color: White, aging to green. Green color persists until frost.
Uses: Versatile 'Annabelle' can be used in many different landscape and garden applications, lending itself well to low hedges, specimen planting, flower gardens, and cut flower beds.
This super-hardy, super easy-to-grow hydrangea goes by lots of different names: smooth hydrangea, Annabelle hydrangea, wild seven bark, hills-of-snow hydrangea, wild hydrangea, native hydrangea, and probably a few more. Botanically, it is known as Hydrangea arborescens and it is native to much of the southeastern United States, from the south of Illinois to northern Florida and from New York state to Oklahoma. If you were to see a smooth hydrangea in the wild, though, you'd barely recognize it: naturally, its flowers are small and not very showy. It is thanks to avid gardeners and talented plant breeders that we have the big, colorful flowers that now characterize this practically fool-proof hydrangea.
Along with panicle hydrangeas, smooth hydrangeas are some of the most cold tolerant on the market, easily thriving and blooming even in chilly USDA zone 3. They are heat tolerant through about USDA zone 8, though can be grown in cool parts of zone 9, such as the Pacific Northwest.
With the recent work on the Invincibelle series done by Dr. Tom Ranney and his team at NCSU, the size range of smooth hydrangeas has gone from pretty much strictly 5'+ to a huge selection in the 2-3' range, and some as small as just 1-1.5' tall and wide. With a little research, you'll find the perfect variety for any space!
We recommend at least four hours of sun each day, or filtered light throughout the day. This makes a huge difference in the stem strength, as plants that are in too much shade will stretch toward the light, leading to thin, spindly growth that can't support the flower heads. For the pink varieties, sun also helps to bring out the purest, truest colors. Finally, in too much shade, you may find that mophead varieties don't fully develop and take on some characteristics of lacecap flowers. In hot climates, sun should only be in the morning, and during the hottest part of the day, they should be in shade.
Easy-going smooth hydrangeas aren't fussy about soil, but they do require it to be well-drained. They won't do well in soils that are too wet nor soils that are too dry. Soil pH is not an issue, as they can grow well in acidic to slightly alkaline conditions, and the color of the pink varieties will not change based on soil chemistry as they can for bigleaf and mountain types.
Smooth hydrangeas are naturally fast-growing, and need little to no supplemental fertilizer to do their best. One application of a granular (not liquid) rose fertilizer in early spring should be sufficient in most areas.
For many years, white was the only option for smooth hydrangeas, but that changed dramatically in 2010 when Proven Winners introduced Invincibelle Spirit hydrangea. It was the first-ever pink flowering smooth hydrangea. Since then, new and improved color options have been hitting the market, and now pure pinks, ruby reds, mauvey purples, and even greens are available. The color on these varieties is not impacted by the soil chemistry.
Smooth hydrangeas are one of the few types that bloom on new wood. This is one of the reasons why they are such a reliable performer even in cold climates! It's also what makes pruning them each spring the ideal way to maintain the plants, as it removes any thin buds at the tips of the stems and ensures the growth for the year comes from thicker buds that were created earlier the previous season.
Some people cut smooth hydrangeas like 'Annabelle' all the way to the ground. However, we recommend cutting the entire plant back by about one-third its total height in early spring. You can also remove any thin side branches at this time, as well as any wood that's not showing signs of life. If you prefer, you can do this in late autumn/early winter, you'll just want to wait until the plant is completely dormant before pruning. Our preference is generally to prune in spring, because this leaves the dried flower heads in place all winter, which are much nicer to look at than a bunch of cut-off branches. The plant will not be harmed with late autumn pruning if that's what you prefer.
Smooth hydrangea problems
Largely problem-free, any issues you do see on your smooth hydrangeas are most likely cultural - due to some conditions the plant is experiencing that aren't ideal for growth. That said, there are a couple of issues that may arise that you should know about.
The leaf spots that impact other hydrangeas are usually fungal in nature. However, the most common leaf spot for smooth hydrangeas is actually bacterial. It can be avoided in the same way as fungal leaf spots: avoid overhead watering, provide good air circulation, keep the plant free of stress, and remove any affected foliage when it falls in autumn.
There's only one insect that you are likely to find causing damage on a smooth hydrangea, and that's the hydrangea leaf tier. That's "tie-r," as in, "one who ties," because this little caterpillar makes itself a snug little home in the leaf shoots so that it can feed safely on the developing foliage. These native insects rarely cause any issues for the plant, but once the caterpillar develops into a moth, you may see the foliage is slightly disfigured. If you see the leaves clasped tightly together at the ends of the branches, you can peel them open and smash the green larvae.
Deer cause major issues for smooth hydrangeas: they especially love to eat the flower buds and may eat them before they are even noticeable to the human eye. They also eat the foliage, and smooth hydrangeas tend to be the type that are most severely damaged by deer. If you have deer in your yard, plants should be protected with netting or a spray, and this protection will need to be repeated - maturity does not seem to deter them.
NO RISK 60 DAY GUARANTEE
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Have a problem with your plant? We make it easy to place a claim via email or use the chat bubble. Simply send us a photo of your plant, your order number, and a brief description of the problem within 60 days of receipt of your order. Orders from US are eligible for refund or replacement; Canadian orders are eligible only for refunds. All refunds are based on the plant cost and do not include shipping charges. Allow up to 2 weeks for processing refunds.
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Did you receive an order after September 1? If so, it falls under our fall guarantee. We want to ensure your plants establish in your garden and return the following spring. Therefore, the warranty on your plants is extended to May 31 the next year. Ensure you contact us with images, your order number, and a description of the problem before May 31.
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After 60 days, we cannot be responsible for product that is in your care. This includes overwintering, animals, insects, diseases, poor planting, plants beyond their hardiness zone, drought, flooding, etc. Our expert staff is here to assist you with any problem you may be experiencing. Our goal is that you are successful with our product.
All 18(!) plants survived the winter and most have significant growth.
Can’t wait to plant soon….all plants arrived intact!!
These plants died shortly after delivery. They were supposed to be guaranteed but no refund yet.
Hello! Our customer service team has replied to your emails on 8/1, 8/2, and also 8/6. As they have already mentioned, please email photos of the dead plants to email@example.com, making sure to put your order number and name in the subject line so that we may provide the best assistance possible. Rest assured, we do have a 60-day guarantee on all of our plants. If you received your plants within that timeframe, we will be happy to apply your warranty once we receive the pictures. Happy Gardening!
of the 9 hydrangeas i got from you this year, all are dead
Hello! We're sorry that you've had trouble with your new hydrangeas. Please email pictures of the plant to firstname.lastname@example.org, making sure to put your order number and name in the subject line so that we may provide the best assistance possible. Rest assured, we do have a 60-day guarantee on all of our plants. If you received your plants within that timeframe, we will be happy to apply your warranty once we receive the pictures. Happy Gardening!
'Annabelle' Smooth Hydrangea