Happy Jack® Purple Clematis

Clematis x 'Zojapur'

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.

$26⁹⁹

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Quart Container

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Understanding Plant Options

Nature Hills offers plants in two main formats:

Container Plants: Grown in pots with soil, sized by container volume and plant age
Bare Root Plants: Dormant plants without soil, sized by height measurements

Container Plant Sizes

Container sizes indicate plant age and growing capacity rather than liquid volume equivalents. Our containers follow industry-standard nursery "trade gallon" specifications, which differ from standard liquid gallon measurements.

Young Plants (6 months to 18 months old)

Container Size	Actual Volume	Metric Equivalent
2" x 2" x 3"	0.18 - 0.21 dry quarts	0.20 - 0.23 dry liters
4" Container	0.31 - 0.87 dry quarts	0.35 - 0.96 dry liters
4.5" Container	0.65 dry quarts	0.72 dry liters
6" Container	1.4 dry quarts	1.59 dry liters
1 Quart	1 dry quart	1.1 dry liters
5.5" Container	1.89 dry quarts	2.08 dry liters

Established Plants (18 months to 2.5 years old)

Container Size	Actual Volume	Metric Equivalent
2 Quart	2 dry quarts	2.2 dry liters
#1 Container	2.26 - 3.73 dry quarts	2.49 - 4.11 dry liters
5" x 5" x 12"	3.5 - 4.3 dry quarts	3.85 - 4.74 dry liters

Mature Plants (2-4 years old)

Container Size	Actual Volume	Metric Equivalent
#2 Container	1.19 - 1.76 dry gallons	5.24 - 7.75 dry liters
#3 Container	2.15 - 2.76 dry gallons	8.14 - 12.16 dry liters

Large Plants (3-5 years old)

Container Size	Actual Volume	Metric Equivalent
#5 Container	2.92 - 4.62 dry gallons	12.86 - 20.35 dry liters
#6 Container	5.25 - 6.01 dry gallons	23.12 - 26.42 dry liters
#7 Container	5.98 - 6.53 dry gallons	26.34 - 28.76 dry liters

Bare Root Plants

Bare root plants are sold by height from the root system to the top of the plant. Plants may exceed minimum height requirements.

Common Sizes:

Trees: 1 foot, 2 feet, 3 feet, 4 feet, 5 feet, 6 feet
Shrubs & Perennials: 1 foot, 18 inches, 2 feet

Important Notes

Container Volume Specifications

Trade Gallon Standard: Our containers follow industry-standard "trade gallon" specifications established by the American National Standards Institute (ANSI Z60.1) for nursery stock
Volume Variations: Actual soil volume may vary due to plant root systems and growing medium settlement
Age Indicators: Container size primarily indicates plant age and maturity rather than liquid volume equivalents

Growing Conditions

Plant size can vary based on variety and growing conditions
Container size helps indicate plant maturity and establishment level
Larger containers generally mean more established root systems and faster landscape establishment

Seasonal Availability

Bare root plants are available seasonally when dormant
Container plants are available throughout the growing season
Specific varieties may have limited availability in certain sizes

Questions?

For questions about specific plant sizes or availability, please contact our plant experts who can help you choose the right size for your landscape needs.

Photo courtesy of Proven Winners - www.provenwinners.com

Plant Profile & Growing Essentials

Flowering, Attracts pollinators, Disease resistant, and Fast-growing

Specifications

Botanical Name

Clematis x 'Zojapur'
Height

6-8 Feet
Width

3-4 Feet
Growing Zones

5-9
Sunlight
- Full sun
- Partial shade
Growth Rate

Moderate
Flower Color
- Purple
- Yellow
Leaf Color
- Green
Pollinator Friendly

Yes
Bloom Period

Early Summer, Late Summer
Does Not Ship To

AK, HI, ID, MT

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.

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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Growing Zones 5-9

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Frequently Asked Questions

What is the best planting time and method for Happy Jack® Purple Clematis?

Early spring or fall is the ideal time to plant. When planting, dig a hole twice as wide as the root ball and plant it about 2 inches deeper than it was in the nursery pot—this encourages more stems to emerge from the base. Remember the golden rule for Clematis: "Feet in the shade, head in the sun." Apply a thick layer of mulch or plant low-growing perennials around the base to keep the roots cool.

What are the watering and fertilizing needs?

This vine prefers "cool and moist" soil. Provide about 1 inch of water per week, increasing frequency during extreme summer heat. In early spring, apply a well-balanced, slow-release granular fertilizer (like a 10-10-10) or a specific rose/clematis food to support the heavy summer bloom cycle.

What are the pruning requirements?

Happy Jack® is a Group 3 (or "hard prune") Clematis. This makes pruning simple: in late winter or early spring, just as the buds begin to swell, cut the entire plant back to about 12 inches above the ground, just above a pair of healthy buds. This removes the old woody growth and encourages a flush of vigorous new stems that will carry the season's flowers.

Is this variety deer and pest resistant?

Generally, Clematis are considered deer resistant, as the foliage contains compounds that are unpalatable to most browsers. While Happy Jack® is bred for vigor, keep an eye out for Clematis Wilt. Ensuring good air circulation and consistent moisture will keep the plant robust and disease-resistant.

Is Happy Jack® suitable for container growing?

Yes! Because it stays under 8 feet, it is an excellent choice for large containers (at least 15-20 gallons). Ensure the container has excellent drainage and provide a trellis or cage for the vine to climb. Container-grown Clematis may need more frequent watering and a bit more winter protection in colder zones.

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

Happy Jack® Purple Clematis

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