Hydrangeas are beloved by florists, brides, and backyard gardeners for their beauty and exotic hues. However, my husband Ken and I refer to these beauties as we grow over 1,000 plants in all the hydrangea groupings “They are so trouble-free and reliably deliver mid- to late-season color for many years that people refer to them as the lazy gardener’s plants.
This well-known plant is also simple to grow because it doesn’t appear to be susceptible to pests or diseases. Even the lack of fragrance, with the exception of paniculatas, is a benefit for gardeners who don’t want to entice bees.
In and of itself, the history of hydrangeas is a tale. The only indigenous plants from America are arborescens and quercifolia. The majority of the others were originally from Asia. They were transported to Europe and given to hybridizers, who fully developed them.
The plants have names in several languages since they are dispersed over the world. The names may be an acronym for a nation, a well-known garden, a nurseryman, his girlfriend, local birds, or a type of flower. It is interesting to look back on a particular plant’s past. Here, reference books are useful.
It is entertaining to bring a handbook to nurseries and look for dated varieties hidden in a forgotten spot. These books, according to Janice Becker of Harmony Hill Hydrangeas:
“by Toni Lawson-Hall and Brian Rothera, Hydrangeas: A Gardener’s Guide, Timber Press
We receive several inquiries about these conventional, carefree plants. We have been producing hydrangeas for the nursery industry and other shops for 16 years, which explains why. Although we are not hydrangea experts, I often make the point that we know what works for us in western Oregon.
Though I adore every kind, I must admit that I find the older plants to be more reassuring than the fresher, more intriguing imports. We began with cuttings from a Blue Wave hydrangea that was grown in my grandmother’s garden in old Oswego, so that may be the reason. I hold it in the highest regard.
There are numerous hybrids of each type, including Macrophylla, Quercifolia, Paniculata, Aspera, and Arborescens, and they all have distinctive traits. What kind of plants should one plant?
The delicate aspera groups and the traditional, vibrant macrophyllas (mop-head and lacecap) are our favorites. These are typically cultivated in partially shady locations.
Sunny environments are preferable for the whites, quercifolia (oakleaf), arborescens (giant white heads), and paniculata (an erect plant with towering flower trusses) groupings.
Our traditional tastes may evolve. Numerous commercial nurseries continue to astound us with new types that outperform the more established ones, making them worthwhile of further investigation.
Here are some of our seasonal hydrangea care suggestions so you may be that lax gardener while still taking advantage of a long season of beauty:
In our region, midwinter is the ideal time to plant or relocate woody shrubs like hydrangeas. The plants will have plenty of time to grow new feeder roots to support them throughout the summer, barring a hard winter.
Before inserting the plant, it’s a good idea to fill the hole with water and let it drain a few times. Soil at the bottom of the hole will have moisture, which will promote the development of new roots.
Wait until the second season to fertilize; give the plant a year or two to get used to the chemistry of the new location.
The majority of these bushes aim to reach heights and widths of at least 4 feet each. But in order to maintain ours healthy and blooming, we give them a nice grooming every winter.
A simple reminder is to groom them in February and early March, just before the new growth emerges, much as you would roses. While the rest of the kinds are deciduous and will have naked stems in the dead of winter, the oakleaf varieties will retain their fall hues until new growth replaces it in the spring.
It is not necessary to cut the shrub all the way to the ground in our environment; if you prune the shrub too severely, you run the danger of losing flowers for the next season.
By cutting away roughly one-third of the plant each winter, the aim is to renew the shrub and expose it to light and air. Be dependable. It is not enjoyable to attempt to recover an old shrub that has grown to a height of 8 feet, has hardy old stems, and only has a few flowers on the edges.
Three to five old, woody stems that are no longer robust enough to produce blooms should be pruned down to the top while grooming. Slug breeding places should be removed from the crown all the way to the ground. Ladybugs are frequently found gathering in the plants as they wait for spring.
Trim all the dated flowers at the same time. Find a spot on the stem that is strong enough to hold several flower heads by looking down the stem. Normally, I cut the old flower back to the second set of leaf buds.
You should receive two flower stems from these leaf nodes in the spring, increasing the quantity of blooms each season.
Macrophyllas have the ability to produce new growth anywhere on the stem in addition to producing new shoots from the crown.
Select a stem piece with three to five sets of leaf buds that is medium-firm wood—not too woody and not too fragile. With only the top two sets of buds and leaves remaining visible, remove everything but the little top leaves and bury the plant in damp soil.
You ought to have a rooted cutting in between four and six months. It has to be transplanted into a 2-gallon container to produce roots. After a year of keeping it damp and out of the sun, plant it in the garden.
The Northwest is the ideal environment for hydrangea development. They have rhododendron-like shallow root systems. They therefore value an annual layer of mulch applied late in the fall after the ground has cooled and a springtime application of 2 to 4 inches of compost.
The blooming season for hydrangeas is from June to October, and they come in a wide range of shapes and hues. Typically, they will keep adding new blossoms all season long. Some stick to one color, while others use a variety.
They don’t need chemicals, but you might be able to enhance their natural hues by adding an alkali (lime) for pinks or an acid (aluminum sulfate) for blues.
As people age, many develop richer hues naturally. Whites cannot be changed.
Flowers might endure most of the winter. The quercifolia group will offer extra interest with its textured, oakleaf-shaped leaves in rich burgundy and bronze, which persist until the spring when new growth appears.
The resilience of hydrangeas is incredible. They’ll probably wake up the next morning if they wilt in the heat of a summer afternoon. But don’t put them through too much hardship; otherwise, the cell structure will disintegrate, and the leaves might not regrow until the fall or even the next spring.
When in doubt, prune a plant and wait until spring to see whether any new buds or crown branches appear.
Overhead watering is preferred to drip irrigation. Apply a low-nitrogen acid fertilizer sparingly at the drip line, away from the crown.
It is ideal to cut and prepare fresh flowers very early in the morning while the flowerheads are still moist from the previous night. Remove all the leaves from long stems that have been cut just above a cluster of buds, then place them in deep buckets of cool water away from the sun. Before you wish to recut and arrange them, give them two to three days to rest.
We even transported flower-filled tubs to Central Oregon in the late summer to decorate for weddings and other festivities.
If the flowers begin to wilt, submerge the entire flowerhead, stem included, in a tub of lukewarm water, and let it there for up to several hours. They ought to hydrate again and revive.
I wait for dried flowers until the bloom cycle is complete, which occurs when the entire head feels somewhat leathery to the touch and all the tiny, fertile blooms in the center have flowered.
You should be able to dry the flowers at this stage, which is late in the summer (lacecaps do not dry well).
Individual stems should be placed in a container with an inch of water (do not refill), kept in a dark, cool location, and allowed to dry completely for a week or two. Spray hairspray on the dried flowers to bring out their color. Away from direct sunlight, keep the dried flowers.
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What hydrangea has the earliest blooms?
This hydrangea, appropriately named, has leaves that mimic oak trees as accents. One of the hydrangea species with the earliest blooming times also has stunning fall foliage. This woodland plant is native to North America and has adapted well to the American environment. Oakleaf hydrangeas thrive in full sun to light shade in northern or cooler areas, but in southern or warmer climates, some afternoon sun protection is required. Rich, well-drained soils that are somewhat acidic are excellent for their growth.
Many customers ask why their hydrangeas aren’t blooming. The primary reasons hydrangeas don’t bloom are incorrect pruning, bud damage due to winter and/or early spring weather, location and too much fertilizer.
There are hydrangea kinds that bloom on either fresh or old wood, or even both. Both new and old wood are the growth of the following year (spring), respectively.
- Consider that this year, you bought a Nikko Blue Hydrangea. For the next year, Nikko’s produce blooms in the fall. Your Nikko is therefore creating blooms this fall that will blossom in the spring.
- Therefore, you wouldn’t want to completely prune your Nikko Blue Hydrangea this fall while you are pruning your perennials. Pruning the Nikko Blue Hydrangea this fall would effectively mean cutting off your hydrangea flowers for the upcoming spring.
- The idea behind Endless Summer, a hydrangea variety that blooms on both old and new wood, is that the plant will set blooms this fall to blossom not only in the spring of the following year, but will also keep producing blooms in the spring of the following year to extend the blossoms into the summer.
- Once more, pruning your Endless Summer hydrangea in the fall would mean removing some of the flowers that would blossom in the spring.
The hydrangea’s plant tag will indicate whether it blooms on fresh wood, old wood, or both. It is typically preferable to wait until spring to prune your hydrangeas. As the plant grows, you’ll see stems that are fragile when bent and lack any leaves. Since these stems are dead and won’t produce any flowers, they should be clipped close to the plant’s base.
The second reason why your hydrangeas aren’t blooming is probably the weather. Buds of hydrangeas are extremely susceptible to cold. Therefore, it is a good idea to wrap your hydrangea for the winter if it is an old wood hydrangea. Keep in mind that old wood hydrangeas establish their blooms for the following spring in the fall. Therefore, you won’t have blossoms in the spring if the fall-produced buds are frozen in the winter.
You can wrap anything with regular burlap. Burlap should be wrapped around the plant and filled with mulch or leaves after the first hard frost and after the hydrangea’s leaves have dropped. In order for the buds to survive the winter and sprout the following spring, the plant receives insulation from this. Never wrap your hydrangeas in plastic. When warmer winter days arrive, the plant cannot breathe since plastic, unlike burlap, doesn’t breathe. As a result, the plant can heated to such high temperatures that it cooks within the plastic and perishes.
The second most frequent weather-related cause hydrangeas do not blossom is late spring killing frosts. We saw really chilly temperatures in April both this year and last year after beautiful spring days. When springtime temperatures drop below freezing, hydrangeas need to be covered with an old beach towel or sheet. Because of the temperature dip, there won’t be any blossoms.
The majority of hydrangeas require at least 3 to 4 hours of light per day to bloom. The best light is in the early morning, midday light is acceptable if it is dabbled light rather than beating sun, and afternoon sun is typically too hot. Check the plant label, though. Newer hydrangea cultivars are being created that can withstand more sun exposure time and sun intensity. A hydrangea in full sun will require much more watering than one in diffused light, so keep that in mind.
High nitrogen fertilizer should not be used to feed hydrangeas. Nitrogen is indicated by the first number on the fertilizer ratio. (The ratio stands for N, P, and K) For healthy leaves and general good growth, some nitrogen (N) is required; however, a ratio of 8-16-6 or any similar combination with a higher middle or phosphorus (P) value is preferred. The growth of roots and shoots is encouraged by phosphorus, which improves the blooming process.
Potash (K), the third element’s last quantity and the lowest ratio, is for plant hardiness. Because hydrangeas prefer acidic soil, they can be fertilized with fertilizers designed for such plants. Hydrangeas only require fertilizing twice a year, once in early spring and once in mid-summer. To avoid root burn, make sure the soil is always moist before applying a fertilizer.
What degree does hydrangea flowering cease at?
Many people were dissatisfied last year because their hydrangea shrubs produced few, if any, flowers. It was assumed that the particularly hard winter was to blame.
There are numerous hydrangea species, but the majority of them that are grown by homeowners in their gardens belong to the genus Hydrangea macrophylla.
The two groupings of H. macrophylla are distinguished by the appearance of their flowers. The mopheads have a broad, rounded shape and can range in color from red to pink to white to blue to green and many colors in between. Similar in color, the lacecaps are flattened corymbs with fertile blooms in the center and spectacular clusters of sepals of various sizes around them.
Hardiness zones 6 to 9 apply to H. macrophylla. A hydrangea should, in theory, be able to withstand temperatures as low as -10 degrees. However, in the real world, temperatures as low as 12 degrees and freezes in the late fall or early spring may limit this hydrangea’s ability to flower.
H. macrophylla forms its bloom buds in the summer and the fall in response to the shorter days and chilly temperatures. To achieve bud dormancy, the bud must be refrigerated for 1,000–1,200 hours, or roughly seven weeks.
As the weather gets warmer, buds open, shoots appear, and blooms grow. Flower buds and vegetative stems will perish if this happens at the end of February, as it did last year and may do this year as well. In the spring, the plant might grow again from the root, but it won’t produce flowers. It has sturdy roots, but delicate flower buds.
On fresh wood, on the woody stems from the current year, H. macrophylla flowers. If a shrub needs to be pruned, it should have been done last year when the blooming season had just ended. Avoid pruning it. You will now remove any budding flower buds.
I have been growing my favorite variety of H. macrophylla for almost 15 years, and it is called “Blue Billows.”
Dr. Richard Lighty of the Mount Cuba Center in Hockessin, Delaware, originally grew this lacecap, Hydrangea serrata, from seed gathered in the Korean mountains. The inner fertile flowers are a darker blue than the outer sterile blossoms, which are blue with a pink blush.
Before relatively recently, the taxonomists classified the H. serrata variation as a distinct species from the macrophylla. It possesses each of the traits that distinguish H. macrophylla from other species. The leaves are smaller, though, and it has a stunning copper-red fall color. From June to October, the plant blooms; as fall approaches, the blossoms turn over to reveal pink undersides.
It is situated for me in some moderate shade with drained soil. They call it a “robust plant.
Most recently, the big root ball split in two when I moved it to a shadier spot. I then discovered that it had sucker-grown or air-layered three smaller plants.
It is a dense shrub that grows to be about 3 feet tall and wide, and it is so covered in leaf and flowers that I was unaware I had four additional plants until I started to move it.
This low-maintenance shrub works well as a border shrub or as a foundation plant. And it will offer you profusion that you can keep or gift to others as a reward. It was chosen by the Pennsylvania Horticulture Society in 1990 as a Gold Medal Plant.
Depending on the amount of aluminum ions in the soil, the color of the flower varies. In more acidic soils, the concentration is higher, whereas in more alkaline soils, it is lower. For the majority of H. macrophylla and H. serrata cultivars, acidic soil (pH 5.5 and below) will result in blue flowers, whereas neutral to alkaline soils (pH 6.5 and higher) will typically result in pink flowers. The blooms will be purple or a combination of blue and pink blossoms will be seen on the same plant between pH 5.5 and pH 6.5.
The most constant guideline for growing hydrangeas, though, is that there is a lot of variety and no absolutes.
At this time of year, Hydrangea arborescens is another hydrangea that merits discussion. It also appears as lacecap and mophead flowers. The names “Annabelle,” “Invincible Spirit,” and “Grandiflora” are a few well-known cultivars. All of these flower on fresh wood. Cut them to the ground now, in late winter, and apply a mild fertilizer.
Place a support structure around the plant before it starts to grow since the flowers are frequently too heavy for the stems to keep the plant upright.
The new plant will start to bloom in June or July and continue to do so for several weeks.
As the petals wilt, cut the stem at the base and remove the leaves if you want to dry them. Cut them to the length you want, then hang them backwards. They make wonderful dried flowers and can be sprayed with spray paint to add color.