Happy Jack® Purple Clematis

Clematis x 'Zojapur'

Proven Winners®

Extended Bloom Season: Produces intense purple blooms from mid-summer through early fall, outlasting traditional 'Jackmanii' cultivars.
Proven Hardiness: Thrives in USDA Hardiness Zones 5-9, showing excellent resilience in both chilly northern winters and humid southern summers.
Compact Vertical Interest: Reaches a mature height of 6-8 feet, making it ideal for smaller trellises, fences, and decorative obelisks.
Low Maintenance Pruning: Categorized as a Group 3 Clematis, meaning you simply cut it back to 12 inches in early spring for fresh, vigorous growth.

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Find your Growing Zone

Plant Size

Quart Container

Product variants

Planting & Care

Where to Plant

Sunlight: This Clematis thrives in full sun to partial shade, requiring at least 6 hours of direct sunlight to produce the deepest purple blooms. In hotter climates, providing afternoon shade helps the flowers last longer and prevents the color from fading too quickly.
Soil: Plant in cool, moist, and well-drained soil that is rich in organic matter. If you have heavy clay, mix in compost to improve drainage, as "wet feet" will cause the roots to rot; think of it like a sponge that should stay damp but never dripping.

Watering Requirements

During the first growing season, water twice a week to ensure the root system establishes deeply. Once mature, this variety is moderately drought-tolerant, but inconsistent moisture during the budding stage will result in smaller flowers or premature wilting. To keep the roots cool and moist, apply a 2 inch layer of mulch or plant low-growing perennials around the base of the vine.

Pruning Tips

Happy Jack is a Group 3 Clematis, meaning it blooms on new wood grown during the current season. In early spring, cut the entire plant back to about 12 inches above the ground, just above a set of healthy buds. This "hard haircut" encourages vigorous new growth from the base and prevents the vine from becoming a tangled, leggy mess at the top.

Fertilizer Needs

Apply a balanced, slow-release fertilizer or a rose food in early spring when new growth first appears. Avoid using high-nitrogen fertilizers late in the summer because this pushes soft, leafy growth that cannot harden off before winter frosts arrive.

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	Flowering, Attracts pollinators, Disease resistant, Fast-growing
Hardiness Zone	4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
Sunlight	Full sun, Partial shade
Height	6-8 Feet
Width	3-4 Feet
Preferred Soil	Clay, Loamy, Sandy
Growth Rate	Moderate
Growth Habit	Bushy, Climbing, Compact, Spreading, Trailing
Plant Life Cycle	Perennial
Blooms In	Summer
Flower Color	Purple, Yellow
Foliage Color	Green
Pet Safety	Toxic to pets
Suitable Space	Outdoors, Container
Plant Name	Clematis
Botanical Name	Clematis x 'Zojapur'
Species	x
Cultivar	Zojapur
Class	Magnoliopsida
Does Not Ship To	AK, HI, ID, MT, OR, PR

If you’ve ever admired the classic 'Jackmanii' Clematis but wished it bloomed longer and with even more intensity, let me introduce you to your new favorite vine: the Happy Jack® Purple Clematis (Clematis 'Zojako'). This Proven Winners® selection is a masterclass in vertical color, offering a refined, modern take on the traditional purple clematis that has graced cottage gardens for generations.

A Modern Twist on a Timeless Classic

The first thing you’ll notice about Happy Jack® is the sheer saturation of its petals. We’re talking about an intense, velvety plum-purple that looks almost like royal silk. Each bloom spans 3 to 5 inches across, highlighted by a bright burst of yellow stamens in the center that creates a stunning "bullseye" effect for pollinators. Unlike older varieties that can be a bit stingy with their second flush, this Clematis 'Zojako' starts its show in mid-summer and continues to pump out flowers well into the autumn, ensuring your garden stays vibrant when other perennials begin to fade.

Vertical Elegance for Any Garden

Because Happy Jack® reaches a manageable height of 6 to 8 feet, it is incredibly versatile. It uses its petioles (leaf stalks) to twine and climb, making it the perfect candidate for dressing up a mailbox, softening the corner of a cedar fence, or scaling a decorative metal obelisk. Its mid-green foliage provides a dense, clean backdrop that stays looking fresh throughout the growing season, unlike some older cultivars that can get "leggy" or prone to powdery mildew.

Effortless Color for Sun or Part Shade

As a "Group 3" Clematis, Happy Jack® is remarkably easy to care for, taking the guesswork out of pruning. It’s a vigorous grower that thrives in those "feet in the shade, head in the sun" spots that Clematis love so much. Whether you are looking to add a splash of deep jewel tones to a small urban terrace or create a massive wall of purple in a sprawling suburban landscape, this vine delivers high-impact results with very little fuss.

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Frequently Asked Questions

What USDA hardiness zones is Happy Jack® Purple Clematis suitable for?

Happy Jack® Purple Clematis thrives in USDA zones 4-9, making it suitable for most temperate regions. This hardy vine can handle cold winters while providing reliable summer-to-fall blooms. Plant it where roots stay cool but the 6-8 foot vine can reach sunlight.

Is Happy Jack® Purple Clematis a shrub or a vine, and does it need support?

Happy Jack® Purple Clematis is a climbing vine that reaches 6-8 feet and requires support structures to climb. It uses its leaf stalks (petioles) to twine around trellises, obelisks, or fences. Shop at Nature Hills for this versatile climber.

What is the mature height and spread of Happy Jack® Purple Clematis?

Happy Jack® Purple Clematis reaches a manageable 6 to 8 feet in height with a spread of 3 to 4 feet. This compact size makes it perfect for smaller spaces like mailboxes, fence corners, or decorative obelisks. Provide sturdy support for climbing.

What are the sun exposure requirements for Happy Jack® Purple Clematis, especially in northern vs. southern climates?

Happy Jack® Purple Clematis thrives in sun to part shade conditions, preferring the classic "feet in the shade, head in the sun" arrangement. In northern climates, it can handle more direct sun, while southern gardeners should provide afternoon shade to prevent stress. Plant where the roots stay cool but the vine can climb into at least 4-6 hours of sunlight.

Does Happy Jack® Purple Clematis require well-draining soil, and what pH does it prefer?

Happy Jack® Purple Clematis thrives in well-draining soil with a slightly alkaline pH of 6.5-7.0. Like most clematis, it's prone to root rot in waterlogged conditions. Plant with mulch around the base for cool roots and shop at Nature Hills for healthy specimens.

How should I water Happy Jack® Purple Clematis, and does it tolerate drought?

Happy Jack® Purple Clematis prefers consistently moist, well-draining soil and is not particularly drought tolerant once established. This vigorous grower benefits from deep, regular watering especially during its extended bloom period from mid-summer through autumn. Water at the base to keep the "feet in shade, head in sun" and maintain steady moisture without waterlogging.

What pruning is needed for Happy Jack® Purple Clematis since it blooms on new and old wood?

Happy Jack® is a Group 3 clematis that blooms on new wood, so it requires hard pruning in late winter or early spring. Cut all stems back to 12-18 inches from the ground before new growth begins. This annual pruning keeps the vine manageable and ensures maximum flowering.

What fertilizer does Happy Jack® Purple Clematis need, and when to apply it?

Happy Jack® Purple Clematis thrives with balanced fertilizer (10-10-10) applied in early spring and mid-summer during its extended blooming period. As a vigorous Group 3 clematis, it benefits from consistent feeding to support continuous flowering from mid-summer through autumn. Apply granular fertilizer around the root zone in March, then liquid feed monthly during peak growing season.

Is Happy Jack® Purple Clematis disease resistant, rabbit resistant, or deer resistant?

Happy Jack® Purple Clematis has clean, dense foliage that stays fresh throughout the growing season, unlike older cultivars prone to powdery mildew. While not specifically mentioned as deer or rabbit resistant, most clematis varieties are generally avoided by these pests. Plant in partial shade with good air circulation for best disease prevention.

Happy Jack® Purple Clematis

Clematis x 'Zojapur'