Hypericum pyramidatum (syn. H. ascyron) - GIANT ST. JOHN'S WORT

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Upright perennial with large yellow, 2" big flowers for 3 week from July. Robust showy wildflower with high value for native bees and other pollinators.

Usually grows to 3-4' tall x 1-2' wide (but in optimum conditions up to 5-6' tall x 3' wide). Plants will spread to wider clump.

Slightly fragrant flowers are arranged in pyramidal clusters, seedheads persist ornamental through winter.

Full sun, half shade (up to light shade), adaptable - average soils to loamy soils or clay, even rocky soil, that stay medium-moist (average) to moist (from acid to alkaline).

Naturally occurs in moist meadows, streambanks, moist woodland slopes, thickets, clearings. Native to central ad upper Midwest and Canada (and eastern Asia), see the USDA distribution map.

Black walnut tolerant.

Xerces recognizes as plant with special value for native bees - attracts many species of bees - offers pollen to bumblebees and smaller bees (the main pollinators). Host plant for 6 native moths (feed on leaves and flowers - Common Pug, Black Arches, Wavy-Lined Emerald, Common Hyppa, Gray Half-Spot, Oecophorid Moth).

The caterpillars of the Gray Hairstreak butterflies feed on the developing capsules and seeds, some aphids and leaf beetles feed on leaves too.

Deer and rabbit resistant - the leaves are somewhat toxic to mammalian herbivores (can cause irritation of the gastrointestinal tract) and can also irritate skin with direct sunlight.

Easy to grow in average soils, prefers some moisture - borders, naturalistic plantings, prairie plantings, pollinator gardens, woodland edges, meadows. Can be combined with with many border perennials, but it will look well with Agastache 'Blue Fortune' Amsonia, Aster novae-angliae, Chelone, Echinacea purpurea (and hybrids), Helenium, Liatris, Phlox paniculata, Physostegia, Rudbeckia maxima, Silene regia, Veronicastrum, Vernonia and taller grasses like Andropogon gerardii, Panicum virgatum or Sorghastrum nutans.

Pot size : square 3.5" x 5" deep pot

Picture copyright : Qwert1234, Commons Wikipedia