New Arrival
Minus icon Plant Type Shrubs
Minus icon Height Medium 2-3'
Minus icon Spacing Plant 2-3' apart
Minus icon Bloom Time Mid-Summer to Early Fall
Minus icon Sun / Shade Full Sun to Mostly Sunny
Minus icon Growing Zones 4-8
Minus icon Soil Type Normal, Sandy
Minus icon Water Needs Medium
Minus icon Sold In Plantable Pots (3.5x3.5x4")
These varieties have been proven in trials around the world to be vigorous and easy to grow. Best of all, Proven Winners are known to be absolutely covered with vibrant, long-blooming flowers.
Hypericum kalmianum 'Sunny Boulevard®' (PP20,045 ''Deppe')
Hypericum kalmianum (Kalm's St. John's Wort) is perfect for containers, mixed borders, and foundation plantings. This plant forms tightly-branched mounds with willow-shaped leaves and produces profuse blooms in mid to late summer. It thrives in full sun and is naturally deer-resistant. A North American native, it was named for Peter Kalm, a student of Linnaeus, who discovered this plant in the wild in North America in the mid-1700s. It works well as a low hedge or border in rock gardens, woodland margins, rocky slopes, wild gardens, naturalized areas, or around ponds.
Hypericum kalmianum grows easily in average, medium moisture, well-drained soils in full sun to part shade. While it prefers moist, rich, sandy loams, it tolerates poor soils. Once established, plants can withstand some drought. Prune to shape after blooming in late summer or in early spring, as the plant blooms on new wood. Northern gardeners should mulch roots for winter protection. Fertilize in early spring using a slow-release fertilizer specialized for trees and shrubs, following label instructions for application rates.
Our plants are grown in 3.5x3.5x4” plantable pots. Made from 100% biodegradable coconut husk fibers (coir), these pots have tremendous advantages over plastic pots. With better air exchange, this "breathable" pot fosters robust root growth and reduces transplant shock since you can plant the pots directly in the ground. The pot naturally becomes part of the soil on its own over time—no composting required—and since they're made from a renewable resource that requires very little energy, they're earth-friendly too!
We offer a 100% guarantee for all our perennials to reach you in good condition and to grow. If you're not satisfied, we'll reship or refund immediately. Please don't hesitate to contact us if you have questions or concerns—we share your passion for gardening and want your new plants to thrive in your border!
We use custom, earth-friendly packaging to make sure your order arrives in great condition, and we ship based on the best planting time for your growing zone (see the approximate dates below), unless otherwise indicated at checkout. If you wish, you can indicate a specific ship date during checkout.
