How to Grow and Care for Weeping Forsythia Shrubs


Forsythia suspensa

Weeping forsythia, Forsythia suspensa, is a one of the parent species of a popular hybrid known as border forsythia, or F. x intermedia.

Appreciated for its arching canes and yellow blossoms, this shrub generally grows to heights of six to 10 feet in USDA Hardiness Zones 5 to 8.

A close up horizontal image of two large weeping forsythia (F. suspensa) shrubs in full bloom growing by a pathway with trees in soft focus in the background.A close up horizontal image of two large weeping forsythia (F. suspensa) shrubs in full bloom growing by a pathway with trees in soft focus in the background.

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Zone 5 is considered a fringe zone for this type, as the shrub itself is cold hardy, but sometimes the flower buds that set on the previous year’s wood are not able to tolerate the cold temperatures characteristic of this zone.

In our growing guide, we discuss how to cultivate and care for Forsythia, a genus that contains 11 species.

This article offers tips for successfully cultivating weeping F. suspensa.

Let’s get started!

Native to China, F. suspensa has naturalized in many parts of the US.

Quick Look

Common name(s): Weeping forsythia

Plant type: Woody shrub

Hardiness (USDA Zone): 5-8

Native to: China

Bloom time: Spring

Exposure: Full sun

Soil type: Average to organically rich, well draining

Soil pH: 6.5-7.5, slightly acidic to slightly alkaline

Spacing: 4-6 feet

Planting depth: Same depth as container (transplants)

Mature size: 6-10 feet wide x 6-10 feet high

Water Needs: Moderate

Taxonomy

Order: Lamiales

Family: Oleaceae

Genus: Forsythia

Species: suspensa

Subspecies: suspensa, sieboldii, fortunei

Cultivars: Nyman’s

It is named after William Forsythe, a Scottish botanist who was one of the founding members of the Royal Horticultural Society.

There are several cultivated varieties of the species, including F. suspensa sieboldii and F. suspensa ‘Nyman’s.’

There is also a more upright type, F. suspensa var. fortunei.

How to Grow

Weeping forsythia is as much about the drama of its form as it is the early burst of lemon-yellow flowers that welcome spring.

With its graceful, arching branches and vigorous growth habit, this deciduous shrub is a favorite for creating natural-looking cascades over walls, slopes, or even in large containers.

A close up vertical image of branches of weeping forsythia with bright yellow flowers growing as a hedge by the side of a pavement.A close up vertical image of branches of weeping forsythia with bright yellow flowers growing as a hedge by the side of a pavement.

Once established, it’s remarkably easy to care for—perfect for gardeners who like their showstoppers low-maintenance.

Let’s dive into the ideal conditions to keep your weeping forsythia happy and blooming its best:

Light

Full sun is ideal for maximum flowering.

Contrary to product write-ups that suggest the suitability of part shade locations, they do not bring out the best results in these shrubs.

In addition to the likelihood of producing sparse flowers and foliage with pale coloration, the soil in shady locations may remain wet and invite unwanted fungal growth.

Just because a plant can “tolerate” shade doesn’t mean it will perform as well there as it will in the sun it craves.

Soil

One of the qualities that makes forsythia so easy to cultivate is that it thrives in all types of soil.

However, there’s a caveat: the soil must drain well.

The best way to understand the ground in your landscape is with a soil test conducted through your local agricultural extension. Learning about soil is fun, and in time, you’ll be able to make some general assessments based on its color and how it crumbles.

A horizontal image of a large weeping forsythia (F. suspensa) shrub growing in a sunny garden with trees in soft focus in the background.A horizontal image of a large weeping forsythia (F. suspensa) shrub growing in a sunny garden with trees in soft focus in the background.

If the soil consists of compact clay, water may run off instead of penetrating the ground to the roots.

The solution is to amend it with compost to create a loose, well-draining substrate in which roots can function optimally.

In addition, if a shrub is planted too low, it may sit in a depression below ground level. If the soil is too dense there, water may pond. Prolonged poor drainage may cause root rotting.

In this case, dig the shrub out and mound up the soil, amending it as needed to keep it loose.

Replace the shrub, taking care to bury the roots two inches deep. Keep the crown, where the stems start, at ground level.

Mounding and loosening dense soil promotes runoff in the event of oversaturation.

And if you have such a location, plant on a well-draining slope that naturally promotes drainage and also inhibits soil erosion.

Temperature and Humidity

Hardy in USDA Zones 5 to 8, weeping forsythia handles cold winters and hot summers without issue. It doesn’t require high humidity and performs just fine in typical temperate climates. Though it can tolerate brief dips below zero, a harsh freeze during early bloom can nip the flowers.

Water

Water young plants regularly to help them establish deep roots. Once mature, weeping forsythia is moderately drought tolerant.

That said, you’ll get better flowering with consistent moisture, especially during dry spells in the spring and summer. A weekly deep watering should suffice unless rainfall is abundant.

Fertilizer

These shrubs generally don’t need feeding if planted in fertile soil. But if you notice weak growth or few blooms, apply a balanced fertilizer in early spring before new growth begins.

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Espoma Plant-Tone

I like to use Espoma’s Plant-Tone for pretty much everything. I buy it in the big 36 lbs bags from Amazon, but it’s also available 18 lbs, and 4 lbs bags.

I split mine up into a couple 5 gallon buckets with lids (to keep the critters out).

A layer of compost worked into the soil annually can also keep things thriving without overdoing it.

Container Growing

You can grow weeping forsythia in a container, but choose one that’s at least 18 inches deep and equally wide to accommodate the root system.

Use a well-draining potting mix and ensure the container has drainage holes.

Keep in mind, container plants will need more frequent watering and annual root pruning or repotting.

Overwintering

In-ground plants don’t require protection in zones 6-8. For those in zone 5, some added mulch over the root zone provides a bit of insurance against winter damage.

For containers, either move the pot into a sheltered location (like an unheated garage) or wrap the container with insulating materials like burlap and straw.

Water sparingly during winter—just enough to prevent the soil from completely drying out.

Maintenance

A bush with a tendency to tip root should be prevented from becoming a thicket of dense growth that raises the ambient humidity and invites fungal disease.

In addition to deterring tip rooting, regular weeding is essential.

Keep the area beneath a bush free of grass, weeds, and debris like twigs and leaf litter. Not only does undergrowth compete for water, it is attractive to insect pests and rodents.

Close up of a branch of Forsythia suspensa with small yellow flowers in bloom.Close up of a branch of Forsythia suspensa with small yellow flowers in bloom.

F. suspensa has very long canes that often trail on the ground. Contact between a growing tip and the earth often results in a proliferation of adventitious roots that anchor a cane to the ground, forming a new plant.

This is an excellent way to propagate new plants that you can detach and relocate.

If you don’t remove the rooted growth, you may find that your shrub “colonizes,” and you have a dense thicket instead of a stand-alone specimen shrub.

In addition, you may find that such density increases the ambient humidity around the shrubs, resulting in fungal growth, as well as pest and rodent infestation.

Learn more about pruning forsythia.

Propagation

F. suspensa is very easy to propagate, and if left to its own devices will often do it for you via tip layering. There are five main methods which we cover in our guide to propagating forsythia.

Alternatively, you can purchase bare roots or existing plants from a garden center or nursery.

Pests and Disease

Weeping forsythia is a robust shrub and as such doesn’t suffer from too many pest or disease issues.

It is resistant to deer, and Japanese beetles leave it alone. Slugs and snails are easy to keep at bay by providing adequate drainage, which also helps to prevent root rot.

Fungal conditions such as leaf spot and twig blight may be a problem if shrubs are planted too close together and/or are too dense to allow for adequate airflow.

And finally, if you notice strange growths, they may be due to a condition called forsythia gall disease.

Best Uses for Weeping Forsythia Shrubs

To begin, there are two types of hedges: formal and informal.

Formal types are pruned to specific shapes and sizes, often resulting in weak, twiggy top growth and bare “legs” with no flowers or foliage.

A close up horizontal image of a blooming hedge of weeping forsythia growing in the garden.A close up horizontal image of a blooming hedge of weeping forsythia growing in the garden.

Informal ones consist of shrubs planted in proximity that are not manicured, but instead are left to take their natural shape and reach the maximum dimensions for their type.

Why sacrifice the artful, cascading canes of weeping forsythia to a high-maintenance, manicured design when there are the more upright F. suspensa var. fortunei and plenty of compact border cultivars available?

Use weeping varieties in informal groupings for a naturalistic, loose arrangement that showcases the species’ attractive curving lines.

Unlike the erect stems of border forsythia, those of weeping cultivars are erect at first, and then they bend and cascade downward.

They afford the opportunity to plant a bush on an upper level of the garden, and have the canes spill down over a retaining wall to a lower level.

In addition, with support, the flexible stems can be arranged and secured with vine tie bands to encourage them to grow upward over a structure, like a trellis.

Long-Lived and Lovely

The artful canes of weeping forsythia add movement to a landscape as they sway gracefully in the breeze.

Whether laden with yellow blossoms in springtime, or lush green foliage all summer long, they’ll prove to be a long-lived garden asset you’ll enjoy for years to come.

A close up horizontal image of bright yellow blossoms adorning a weeping forsythia shrub growing outside a residence.A close up horizontal image of bright yellow blossoms adorning a weeping forsythia shrub growing outside a residence.

As you plant a new shrub or maintain a current one, remember to skip the formal pruning, provide plenty of sunshine, manage those feisty tips, protect it from winter’s worst, try cultivating it like a vine, and keep the weeds away for best success.

Are you growing one of these lovely shrubs in your garden? Let us know in the comments section below!

We hope you’ve found these tips useful. Read these articles next to expand your knowledge of growing forsythia:





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