Ames St. John’s Wort

Hypericum kalmianum 'Ames'

$89⁰⁹ $109⁹⁹

In Stock
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Plant Size

#3 Container

Product variants

Plant Sentry™

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This proprietary eCommerce software prevents the shipment of a restricted plant to each state. The Plant Sentry system includes a shipment certification program. The Plant Sentry Compliance Officer works closely with NatureHills.com and each nursery or fulfillment center to ensure only compliant plants are sold to customers.

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Delivery and Shipping

Shipping

To obtain a more accurate shipment time-frame, simply enter your zip code in the “Find Your Growing Zone” box to the right. Our plants are grown all over the country and lead time on items may be different because of this. Once your order is placed, you will also receive the specific shipment time-frame information as part of your order confirmation. Once an item ships, you will receive shipment notification and tracking numbers, so you can follow along while your plant travels to your doorstep. We use FedEx, UPS, or USPS at our discretion.

Due to winter weather we have put a hold on shipping to the areas shown below in grey. You can still order now and we will ship the plant to you during an appropriate time for your zone.

*If you have found your zone already, it will be highlighted in the table below.

Standard Shipping Rates

At Nature Hills we handle, package and ship the products you order with the utmost care to ensure healthy delivery. Shipping and handling charges are calculated based on the tables below. Please note that some items include an additional handling surcharge, these will be noted on the item's product page.

From	To	S&H
$0	$19.99	$24.99
$20	$49.99	$29.99
$50	$69.99	$34.99
$70	$99.99	$39.99
$100	$129.99	$44.99
$130	$149.99	$48.99
$150	$150+	Approx 28%

Click here to see our full rates

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.

Plant Highlights

Ames St. John’s Wort highlights at a glance!

Specifications

Brand

Nature Hills' Choice
Botanical Name

Hypericum kalmianum 'Ames'
Growing Zones

4-7
Mature Height

2 - 3 feet
Mature Spread

2 - 3 feet
Sun Exposure

Full Sun
Moisture

Widely Adaptable
Soil

Well-Drained
Growth Rate

Medium
Fall Color

Yellow-Bronze/Semi-Evergreen
Pollinator Friendly

Yes
Pollinator Required

No
Pruning Time

When Dormant
Bloom Period

Summer

Growing Zones 4-7

Find Your Growing Zone!

The Ames St. John's Wort (Hypericum kalmianum 'Ames') often commonly called Kalm St. John's Wort, is a native evergreen shrub or sub-shrub with upright branching and lovely green foliage. Ames typically grows in a dense, tall mound 2-3 feet in height and width.

It is a neatly rounded garden shrub with dazzling golden yellow flowers in mid-summer. Ames is slightly harder than other species and has a more uniform shape and those brilliant yellow starry blossoms attract loads of butterflies and local bees. The center of each vibrant little bloom is a spray of golden sparks that are full of vital pollen and nectar resources! Must-haves for the cut flower garden, Hypericum berries are highly ornamental and look great in floral bouquets!

Flowers give way to beaked, oval, brown seed capsules that mature in fall and often persist on the shrub until spring, adding great winter interest. Hardy in the cold, Ames is tolerant down to USDA growing zone 4 and up to 7.

Planting and Application:

Use Ames as an accent, as a property-defining low hedge, for shrub borders and as backdrops to your Cottage and Perennial border! Equally adept at growing in Rock Gardens, rocky slopes, partly shaded naturalized areas, and even along pond peripheries to help secure eroding banks. Fill large hillsides and hard-to-mow slopes in dazzling yellow color and bees, and native pollinators!

St. John's Wort makes itself right at home, even spreading out a little to form neat and tidy colonies while bridging the transition between the yard and the woods, taming the wildness and filling an area with little rays of sunshine! Don't worry about those out-of-the-way areas attracting deer, those uninvited guests will usually leave this plant alone!

Golden Yellow Flowers Mid-Summer
Compact Uniform & Upright Form
Bee & Butterfly Nectar Resource & Hardy Native Cultivar
Glossy Ornamental & Persistent Brown Seedpods
Spreading & Naturalizing, Borders & Backdrops, Erosion & Accents

#ProPlantTips for Care:

Ames St. John's Wort is not particular about soil pH levels and is particularly suited for urban conditions, pollution, etc. St. John's Wort is easy-care when grown in average, medium, well-drained soils in full sun to part shade. It prefers moist, rich, sandy loams and tolerates some drought. Deer seldom bother this plant! Just be sure to provide well-drained soils since Ames Hypericum cannot tolerate wet feet! Apply a generous 3-4 inch thick layer of mulch to retain moisture and insulate the root system from heat and winter's chill. Prune while dormant to control the size and shape.