Mr. Mustard® False Spiraea

Sorbaria sorbifolia 'Mr. Mustard'

Proven Winners®

Hardy in zones 2-7, one of the toughest flowering shrubs available for cold northern gardens
Spring foliage erupts in a striking mix of yellow, orange, red, pink, and lime green before settling into rich kelly green in summer
Creamy white, astilbe-like flower plumes bloom through summer and attract bees, butterflies, and hummingbirds
Compact at 2-3 ft tall, tolerates clay and alkaline soils, and stays deer resistant season after season

$26¹⁴

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Plant Size

Quart Container

Product variants

Planting & Care

Where to Plant

Sunlight: Aim for at least six hours of direct sunlight daily. Mr. Mustard® performs well in part sun too, but you will get the most vivid spring foliage color and the heaviest flower display in full sun. Plants in shadier spots tend to stretch and produce fewer blooms.

Soil: This shrub is refreshingly easy on the soil requirements. It grows well in average, well-drained soil and actually tolerates clay and alkaline conditions that would slow down many other ornamentals. Rich, overly amended soil can encourage vigorous suckering, so resist the urge to over-improve the planting site. Good drainage matters more than fertility.

Watering Requirements

Water thoroughly at planting and keep the root zone consistently moist during the first growing season while the shrub establishes. Once settled in, Mr. Mustard® has average to moderate water needs and handles short dry spells without drama. During prolonged summer heat, a deep soak once a week is enough to keep it looking its best. Avoid soggy, waterlogged conditions, which can stress the roots.

Pruning Tips

Mr. Mustard® blooms on new wood, so you have flexibility in how and when you prune. In late winter or early spring, before new growth appears, cut stems back hard to encourage a flush of fresh, colorful foliage and a tidy mounded shape. You can also remove root suckers with a sharp spade throughout the growing season if you want to keep the plant contained rather than allowing it to naturalize into a spreading colony. Deadheading spent flower plumes is optional but keeps the plant looking tidy into late summer.

Fertilizer Needs

This shrub does not need much feeding to perform well. In early spring, a light application of a balanced, slow-release fertilizer formulated for shrubs is all it needs for the season. Avoid high-nitrogen fertilizers, which push excessive leafy growth and vigorous suckering at the expense of flowers. If your soil is reasonably fertile, you may find that a top-dressing of compost each spring is sufficient.

Delivery and Shipping

Shipping Rates

Ships in 7-10 business days • Tracking provided • Weather protected

Under $50	$9.99
$50 - $99.99	$14.99
$100 - $149.99	$16.99
$150 - $198.99	$24.99
$199+	FREE

✓ Zone-specific timing • ✓ Professional packaging • ✓ Health guarantee

Understanding Our Container Sizes

At Nature Hills, our plants are sold in industry-standard nursery containers. You will notice we use the word "container" rather than "gallon." Container numbers follow a nursery trade size standard, not liquid volume. The number tells you the plant's size category and general maturity level. A larger container means a more established plant with a stronger root system.

Container Sizes

Quart

Plant age: 6 months to 1 year
Best for: Ground covers, perennials, ornamental grasses
What to expect: Our smallest and most affordable size. Well-suited for planting in multiples across a large area. Allow 1 to 2 seasons for full establishment.

#1 Container

Plant age: 1 to 2 years
Best for: Shrubs, perennials, smaller trees
What to expect: About the size of a large coffee can. A well-developed root system in a manageable size. Good value choice when you have time to let the plant grow into the space over a season or two.

#2 Container

Plant age: 2 to 3 years
Best for: Shrubs and trees where you want faster establishment
What to expect: A noticeable step up from a #1 in both plant size and root development. Good choice when you want visible presence without going to a larger size.

#3 Container

Plant age: 3 to 4 years
Best for: Most plants, most situations — flowering trees, shade trees, evergreen shrubs
What to expect: Our most popular size. Strong, developed root system. Plants in a #3 container make an immediate visual impact from day one. If you want a head start rather than waiting seasons for a plant to fill in, this is typically the right choice.

#5 Container and Larger

Plant age: 4 to 5+ years
Best for: Specimen plants, privacy screens, maximum instant impact
What to expect: Large, mature plants ready to make an immediate statement in your landscape. We also carry #7 and larger sizes for select varieties.

Why "Container" and Not "Gallon"?

Nursery container sizes follow an industry trade standard established for the nursery and horticulture industry. The number is a size designation, not a measurement of liquid volume. Actual soil volume varies by plant type, root mass, and growing medium. Using "container" is the accurate industry term. When you see #1, #2, or #3, think of it as the plant's size tier, not a gallon measurement.

Root Pouch Containers

Some Nature Hills plants arrive in a Root Pouch, a breathable fabric container made from 100% recycled materials. Root Pouches encourage denser root development through air pruning, which discourages root circling and promotes a stronger, more fibrous root ball at the time of planting.

Plants growing in Root Pouch fabric containers, showing the breathable woven fabric construction

There are two types. Knowing which one you have changes how you plant:

Degradable (brown or tan fabric): Plant the entire pouch directly in the ground. The fabric breaks down naturally in the soil over time.
Non-degradable (black or gray fabric): Remove the pouch before planting. Cut the bottom open with scissors, then peel the sides away. The fibrous root ball will hold its shape.

Not sure which type you have? Check the tag on your plant or contact us and we will confirm.

Full Root Pouch planting guide

Choosing the Right Size

Size	Plant Age	Best For
Quart	6 mo to 1 yr	Ground covers, perennials, grasses. Budget-friendly for mass plantings.
#1 Container	1 to 2 yrs	Shrubs, perennials, small trees. Value choice for patient gardeners.
#2 Container	2 to 3 yrs	Shrubs and trees where you want faster establishment.
#3 Container	3 to 4 yrs	Most plants. Immediate visual impact. Our most popular size.
#5 and larger	4+ yrs	Specimen plants, privacy screens, maximum instant impact.

Still not sure which size is right for your project? Our plant specialists are happy to help. Contact us and we will point you in the right direction.

Plant specifications
Plant Characteristics	Cold hardy, Attracts pollinators, Flowering, Drought resistant, Fragrant, Fast-growing, Low Maintenance, Deer-resistant, Fall Color/Interest, Groundcover
Hardiness Zone	2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b
Sunlight	Full sun, Partial shade
Height	2-3 ft
Width	3-4 ft
Preferred Soil	Clay, Peaty
Growth Rate	Fast
Growth Habit	Upright
Blooms In	Summer
Flower Color	White
Foliage Color	Green
Suitable Space	Outdoors
Botanical Name	Sorbaria sorbifolia 'SMNSSC'
Species	sorbifolia
Cultivar	SMNSSC
Class	Rosales, Magnoliopsida
Does Not Ship To	AK, HI, ID, MT, PR

A Shrub That Puts on a Show Before the First Flower Opens

Most flowering shrubs keep you waiting until bloom time to earn their place in the garden. Sorbaria sorbifolia 'SMNSSC', sold as Mr. Mustard® False Spiraea, starts its performance the moment new leaves push out in early spring. The emerging foliage is a swirling blend of yellow, orange, red, pink, and lime green, vivid enough to stop you in your tracks. It is the kind of spring color you usually have to plant a dozen tulip bulbs to achieve, and this shrub delivers it all on its own, year after year.

As temperatures warm and the season shifts into summer, that kaleidoscope of color settles into a clean, bright kelly green. That is when the flowers take over. Soft, feathery plumes of creamy white blooms rise above the foliage, looking very much like oversized astilbe flowers. They sway gently in a summer breeze, catching light and attracting bees, butterflies, and the occasional hummingbird from early through late summer.

Compact Size, Tough as Nails Character

What sets Mr. Mustard® apart from the straight species of False Spiraea is its size. The common species can muscle its way to 10 feet tall and wide, crowding out everything around it. This Proven Winners® selection stays a manageable 2 to 3 feet tall with a spread of 3 to 4 feet, making it genuinely useful in modern gardens where space is limited. It is also one of the hardiest flowering shrubs available, rated to zone 2, so gardeners in Minnesota, Montana, and the Upper Midwest who struggle to find ornamental shrubs that survive the coldest winters will find a reliable ally here.

Mr. Mustard® is also rated for low flammability, a practical consideration for gardeners in fire-prone areas who want attractive landscaping that contributes to a defensible space.

Landscape Uses

This shrub shines in mass plantings along slopes or embankments, where its spreading, suckering habit actually works in your favor for erosion control. It makes a low, flowing hedge along a border edge, a groundcover-style planting under tall trees in part shade, or a colorful anchor in a mixed shrub border. Plant it in groups of three or five for a dramatic spring foliage display, or use a single specimen as a bold accent in a cottage or informal garden. Just keep a spade handy to manage suckers if you want to maintain a tidy mounded shape rather than a spreading colony.

Why This Cultivar, Not the Species

The species Sorbaria sorbifolia has a well-earned reputation for spreading aggressively, and it has naturalized in parts of the northeastern U.S. Mr. Mustard® is a compact, patented selection that is far better behaved at roughly one-fifth the size of the species. It gives you all the ornamental appeal, including the show-stopping spring color and summer blooms, without the management headache. For gardeners who want the look without the work, this is the cultivar to choose.

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Frequently Asked Questions

How tall and wide does Mr. Mustard® False Spiraea grow at maturity?

Mr. Mustard® False Spiraea reaches 2 to 3 feet tall with a 3 to 4 foot spread at maturity. This compact size makes it much more manageable than the straight species, which can grow to 10 feet. Perfect for modern gardens where space is limited.

Is Mr. Mustard® False Spiraea a fast-growing or slow-growing shrub?

Mr. Mustard® False Spiraea is a moderate grower that reaches its mature size of 2-3 feet tall in 2-3 seasons. This compact selection grows much slower than the species, which can hit 10 feet. Plan spacing based on its 3-4 foot spread when shopping at naturehills.com.

Is Mr. Mustard® False Spiraea deer resistant?

Mr. Mustard® False Spiraea is generally deer resistant due to its tough nature and plant characteristics. While no plant is 100% deer-proof, this hardy shrub's resilience makes it less appealing to browsing deer than many other flowering options.

What are the best companion plants to grow with Mr. Mustard® False Spiraea?

Mr. Mustard® False Spiraea pairs beautifully with perennials that bloom in complementary seasons, like hostas, astilbe, and ferns that appreciate its light shade. At 2-3 feet tall, it works well fronted by shorter perennials like coral bells or lungwort. Plant it with spring bulbs to extend the early season color show beyond its vibrant emerging foliage.

Is Mr. Mustard® False Spiraea drought tolerant once established?

Mr. Mustard® False Spiraea develops good drought tolerance once established, typical of the hardy Sorbaria family. This zone 2-rated shrub adapts well to various conditions after its first growing season. Water regularly the first year, then it should handle dry spells. Shop at Nature Hills for this resilient performer.

Mr. Mustard® False Spiraea

Sorbaria sorbifolia 'Mr. Mustard'