The kinds of hydrangea that are available and thrive in Colorado’s zones 3 through 6 are mentioned here. The majority of types enjoy full sun, but not direct sunlight; they can withstand late-afternoon darkness without wilting. Plant them on rich, loamy soil that drains well.
How can I maintain hydrangeas in Colorado?
Shrubs called hydrangeas have attractive leaves and enormous, gorgeous summer blooms. They flourish in the shadow and add color to the garden with blossoms that are blue, pink, white, or lime green. A row of plants creates a flowery hedge, while one produces an exceptional specimen. There are dwarf and container versions that are compact but nevertheless produce large blooms for tiny gardens. All hydrangeas bloom in the summer, and there are several newer types available that will continue to bloom well into the next growing season. The landscape receives one final burst of color in the fall as the leaves change copper, orange, and pink.
Hydrangeas come in a variety of varieties with various flower styles and leaf shapes. The mophead form with large bloom balls is the most popular. Due to their large leaves, these are also called as smooth hydrangeas and bigleaf hydrangeas. Many of these make excellent garden plants, but they are frequently planted in tiny pots for florist blooms. In Denver, search for types that can withstand the cold, such as Annabelle and Incrediball, as well as the Endless Summer and City Line series. A petite cultivar with pink flowers, City Line Paris is around 3 feet tall and perfect for patio containers.
With a compact central cluster of tiny starry blooms surrounded by bigger open-faced sterile flowers, the flowers of the airy lacecap are flat and loose. The flower clusters, which can be rather enormous, put on an impressive display in the shade. Select a cultivar with white-marbled leaves to further brighten shady areas.
Large lobed leaves and tall clusters of flowers that are often white or greenish are characteristics of oakleaf and panicle hydrangeas. In the Denver area, they overwinter fairly successfully, becoming into big bushes with intriguing peeling bark. Select Hydrangea Quick Fire for more color. White at first, the bloom soon turns pink. Again, if room is restricted, compact types are available.
Many different sun and shadow situations are suitable for growing hydrangeas. Ensure there is sufficient sunlight for blossoming. Flowering will be reduced by excessive shade. Hydrangeas require organically rich, wet soils with good drainage. The majority of Colorado soils will benefit from the addition of peat moss and compost, which will help the soil retain moisture and become more acidic. Mulch is also useful for maintaining uniform soil moisture. Following planting, check often and water as necessary. For the first year or two until the plant is established, water it well. To avoid winter kill, don’t forget to water once a month during the winter.
How hydrangeas react to the chemistry of the soil is one of its intriguing characteristics. Alkaline soils generate a wide variety of pink blooms, while acidic soils will result in blue flowers. The availability of aluminum compounds that produce the floral hues is affected by the acidity balance of the soil. To control the color, there are a variety of soil treatments available, including peat moss for blue. Ask the specialists at City Floral for color suggestions because not all kinds respond to the soil treatments.
There are two components to hydrangeas’ winter hardiness. Because flower buds are frequently more delicate than leaf buds, hydrangeas can occasionally suffer damage from heavy frost if it occurs when the flower buds are most exposed. There are no blooms, but the plants will leaf out and grow healthily.
Where the flower buds develop is another aspect of hydrangeas. Some cultivars begin to grow buds on branches in the fall, overwinter, and then bloom the following spring. On ancient wood, they are supposed to bloom. The flower buds may die in the fall from an early hard frost. On aged wood, the bigleaf and oakleaf types bear fruit. These types’ flower buds will also be removed during the fall pruning process to eliminate the old wood. Pruning should be postponed until after spring blooming.
On newly formed branches that have sprouted throughout this blooming season, other hydrangeas, such as the smooth and panicle varieties, bloom. As the buds are emerging from dormancy, late spring frosts can harm this group. To protect the bloom, keep an eye on the weather and cover the plants. Since this group will generate blossoming new wood in the spring, pruning can be done in the fall.
For improved spring and fall hardiness, new hydrangea hybrids and cultivars are being chosen. Compact kinds require less pruning because they get smaller as they develop. Ask about trimming suggestions for the kinds you have chosen to get the most blooms. You’ll be overjoyed with the outcomes come next summer.
How are hydrangeas prepared for winter in Colorado?
Winter winds and cold temperatures both have the potential to be fatal. This catch-all phrase simply denotes plant dying over the winter. The plant may perish due to the low winter temperatures or from drying out brought on by the winds.
Since hydrangeas become dormant in the winter, winter damage to hydrangeas can not become apparent until spring. If your hydrangea doesn’t produce any green shoots in March or April, it could be your first indication of harm.
Protecting the shrubs from winter’s wrath is necessary to avoid winter kill in hydrangeas, which includes the young buds on the plants. Laying down a heavy layer of mulch over hydrangeas’ root zone is a wonderful place to start with winterizing them. For this, straw works wonderfully.
Use a wire cage to enclose the shrub or construct a cage around it using sturdy posts and chicken wire for even better protection. Wrap the cage in burlap or insulating material. Additionally, you should give the plant a lot of water right before the ground freezes.
Enhance Your Denver Garden with Beauty and Graceful Color
The hydrangea’s distinctive big, vivid, clustered blossoms are what make them so remarkable! You might be unsure of which hydrangea shrub is appropriate for your Denver garden with the more than 70 types available. The Denver area’s leading hydrangea experts are located at City Floral Garden Center, which also offers a wide selection of shrubs and the necessary advice to ensure that you choose one that will flourish in your yard.
Choosing the Right Hydrangea for Your Garden
The hydrangea plant is known for its attractive leaves and enormous, gorgeous summer blooms.
With hydrangeas that produce blue, pink, white, or lime-green blooms, expect splashes of color and a brighter garden landscape. The shrub also offers a diversity of leaf forms and bloom varieties!
Consider the impression you want this lovely shrub to have as you lay out your landscaping for hydrangeas. A single hydrangea planting can make a bold impression. Or you might grow a number of hydrangeas to create a floral hedge or a natural fence to divide different parts of the yard. Dwarf or container hydrangea cultivars that are compact but still have a big blooming impact can be better for smaller gardens!
A variety of hydrangea plants that are hand-selected for success in Denver landscapes are available from City Floral Garden Center. It is possible to find bigleaf hydrangeas, smooth hydrangeas, winter-resistant cultivars like Annabelle and Incrediball, and the Endless Summer series. Hydrangeas with an alternate leaf and flower shape that can survive the winter in wintry Denver include oakleaf and panicle varieties. These are only a few of the plants we offer that are effective.
How to Care for Your Hydrangea
When hydrangea plants are positioned to receive morning sunlight and afternoon shade, they thrive. Sunlight is essential for strong and plentiful blooming! In addition to being able to be placed under trees for filtered shade, hydrangeas thrive in places that face north and east.
The quality of the soil, like with other plant or shrub, will contribute to its success. Compost and peat moss amendments to the soil in Colorado aid in drainage as well as helping to create the ideal pH environment. After planting, sprinkle long-acting fertilizer and gently loosen the root ball.
Planting this shrub closer to other plants that require similar amounts of water is a good idea because it enjoys wet, protected settings. For the first two years, water your hydrangea frequently and thoroughly, once a month throughout the winter.
Hydrangea Expertise and Advice Blossoms Success
Our team is prepared to assist you in choosing the appropriate area, species, and planting placement for your hydrangea. We know the best growing environments and provide a wide variety of hydrangea bushes that will like your Denver landscape!
There is a huge variety of the most gorgeous annual plants at City Floral! We take pride in offering full-color plant and flower alternatives all year long and provide plants that are made to thrive in Colorado thanks to our own floral production.
Visit City Floral Garden Center at 1440 Kearney Street in Denver, Colorado to see our tree nursery, plants, flowers, outdoor furniture, pots, gardening supplies, and anything else you would need to have a lovely Denver garden! Since 1911, we have been a proud small business serving Denver.
Where should hydrangeas be planted for greatest results?
Plant hydrangeas close to a water source in an area with lots of light. Choose a location in the South where there is morning sun and afternoon shade. Hydrangeas can tolerate full-day sun in the north.
In Colorado, which hydrangeas grow best?
Hydrangea (Hardy types for Colorado)
- Hydradendron arborescens “Annabelle”
- A gorgeous hydrangea with white blossoms up to 12 inches wide is called Hydrangea Annabelle.
- Paniculata hydrangeas may flourish and develop in a wide range of environments (they are hardy to Zone 3!).
- Mature 6 to 8 feet in height.
In Colorado, how frequently should hydrangeas be watered?
Although the hydrangea’s leaves and flowers seem delicate, little careful care is actually needed for them. Everything you need to know about caring for hydrangeas is provided in these recommendations.
- Over the course of the growing season, water at a rate of 1 inch per week. To promote root growth, deeply water three times each week. All varieties of hydrangeas benefit from constant moisture, but bigleaf and smooth hydrangeas need more water. To water thoroughly while keeping moisture off the flowers and leaves, use a soaker hose. Hydrangeas won’t wilt as much if they are watered early in the day on hot days.
- To keep the soil around your hydrangeas cool and moist, add mulch. Over time, an organic mulch decomposes, supplying nutrients and enhancing soil texture.
- Apply fertilizer according to the type of hydrangeas you have. Every variety has varied requirements and will profit from applying fertilizer at various times. A soil test is the most effective tool for determining your fertility requirements.
- In March, May, and June, bigleaf hydrangeas require numerous mild fertilizer applications.
- Two applications in April and June work best for oakleaf and panicle hydrangeas.
- The only time smooth hydrangea plants require fertilizing is in the late winter.
- By selecting cultivars with resistant characteristics, you can avoid pests and diseases. Hydrangeas can have leaf spots, bight, wilt, and powdery mildew. Although they are uncommon on hydrangeas, pests might arise when the plants are under stress. Aphids, leaf tiers, and red spider mites are examples of potential pests. Your best line of defense is to properly care for hydrangeas.
Do I need to protect my hydrangea throughout the winter?
Here is professional guidance on how to put hydrangeas to bed for the winter season from guest bloggers Megan Nichols and Jessie Jacobson of Tonkadale Greenhouse in Minnetonka, Minnesota. (They may have more hydrangea trees and shrubs in their zip code than almost anywhere else in the United States, so they are aware!)
The temperature has dropped, and autumnal symbols can be seen everywhere. The garden needs to be put to bed soon. Hydrangeas reward us with large, stunning, and prodigious blooms all season long. You may say that they are givers. It’s time to return the favor now. It’s time to tuck the hydrangeas in with kisses and wishes for sweaty dreams.
Here in Minnesota, our moods can fluctuate as drastically as the unpredictably harsh winter weather extremes, snowfall, and freeze/thaw cycles. Despite the fact that many hydrangeas are regarded as hardy, all of this can confuse them. To survive the winter and come back bigger and better the next year, they require some care. Although hydrangeas cultivated in warmer areas don’t need as much post-season primping as those grown in our zone, there isn’t a single thing that wouldn’t appreciate a little tender loving care right now.
Utilize these suggestions to get the most out of your hydrangeas so that you can be the one to present at this time next season!
(Is pruning in order? No and yes. Here is our recommendation for which hydrangeas should be pruned right away and which should wait until spring.)
Don’t Stop Watering
Make a commitment! I shall water my hydrangeas till the earth freezes solid, you declare while raising your right hand. really good Hydrangeas are thirsty plants by nature, so it’s essential to give them regular, deep watering. We don’t need to get all linguistically nerdy right now, but their name literally means “hydration.” Winter’s cool, dry winds completely drain the moisture from the vegetation, and hydrangeas don’t use lip balm. It need not be heated in order to be dry!
If a freeze is not a concern where you live, water deeply but sparingly during the winter depending on how much rain you get.
This is how: Making a small hole in the side of a 5-gallon bucket, filling it with water, and placing it at the base of the plant while it slowly drips out of the bucket is one method. Another option is to lay your hose at the base of the plant for about an hour with the water turned on to a gentle drip.
Give Them One Last Hearty Meal
Composting your hydrangea beds in the fall will give them a boost for the upcoming growing season. Everyone feels better after a full night’s sleep and a filling breakfast. This also applies to hydrangeas. After a lengthy winter’s hibernation, they will be ravenous for some nice compost. Compost can decompose during the winter if it is used now, making nutrients easily accessible in spring. A few inches of compost is advisable even in regions without a deep cold. Only compost is being discussed here! Don’t give your hydrangeas fertilizers that are high in nitrogen because this can encourage them to produce new foliage growth.
This is how: Before laying down mulch in colder climates, top dress the area with compost, well-aged manure, or other organic material after the ground has frozen. This organic fertilizer, which is rich in nutrients, will decompose over the winter, making nutrients available to the plant in the spring. Apply compost in the late fall or early winter in zones that are warmer.
Mulch Matters
Mulching helps keep moisture in and weeds out in warmer climates while shielding the crown and roots of your hydrangeas from harsh winter temperatures in colder climates. Snow serves as a natural insulator if everything goes as it should. Plants suffer during strange winters with little snowfall and extreme temperature changes. Apply a thick layer of mulch around the plant’s base to offer hydrangeas the best chance of flourishing. While decorative mulch is useful, straw, marsh hay, or dead leaves are suggested instead.
This is how: Apply a 6–8 layer of mulch once the ground has frozen (or late fall or early winter in zones with milder winters). This shields plants from the heave-ho of springtime freeze/thaw cycles, which can yank them out of the ground. Inviting mice to make this their snug winter home, causing rotting and illness, or tricking the plant into believing it’s time to bud, are all consequences of mulching too early. Be patient; you don’t have to do things early simply because your neighbors are.
Keep Them Cozy
The amount of winter cold determines whether or not hydrangeas require protection. Winter protection is not required in zone 7 if the air temperature stays above zero degrees. Wrap or totally cover barely hardy hydrangeas in chilly areas. This is crucial for plants that bloom on old wood, such hydrangeas with mop heads and large leaves (Hydrangea macrophylla). The most recent types of mop head/big leaf hydrangeas, however, bloom on both fresh and old wood, so it’s important to keep that in mind. In their favor and ours! Hardier hydrangea varieties like the paniculata and arborescens don’t often require additional winter care, although really low temperatures might cause its limbs to die back. Consider covering if a colder than usual winter is forecast.
This is how: Wrap plants loosely in a few layers of burlap, making sure to tie it off with strong twine. Making a mulch mountain and covering the majority of the plant is an additional choice. Smaller, newly planted specimens respond well to this technique.
There’s Still Time To Plant!
The first three varieties of hydrangeas can be grown here in Zone 4; oak leaf hydrangeas can also be grown in warmer climates (zones 5 to 9). The optimal time to plant shrubs is in the fall. Just make sure to do all of the aforementioned things, including watering and mulching.
Here are some of our favorites that you can plant now for stunning blooms the following spring.
Panicle Hydrangeas
These late blooming hydrangeas, sometimes known as PeeGee hydrangeas (summer into early fall). They are covered in elongated, conical flower heads that emerge white or green and blush into pinks and peaches as the season goes on.