Hypericum pyramidatum (Great St. John's Wort)
Hypericum pyramidatum (Great St. John's Wort)
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Pure Live Seed
Pure Live Seed
Seed is provided in Pure Live Seed (PLS) unless otherwise stated.
Pure Live Seed (PLS) expresses the viable seed content of a seed lot using its purity and germination or viability test results. It helps you compare seed lots and calculate how much bulk seed is needed to meet a specified PLS planting rate.
PLS weight and bag weight
PLS weight is not the same as the total weight of seed in a bag. For example, a lot with 80% purity and 75% viability contains 60% PLS: 80 × 75 ÷ 100 = 60. Supplying 10 lb PLS from that lot requires about 16.67 lb of bulk seed.
Use the current seed test and the stated basis of the mix specification. Germination calculations may include applicable hard or dormant seed. Seed-count estimates also require the number of seeds per pound; PLS alone does not provide a seed count.
What to check when buying a mix
Check whether each rate is stated in PLS pounds, bulk pounds, or a combination. A mix with both bases should not be described as having an all-PLS total.
PLS does not remove weed seeds or guarantee establishment. Review the seed label and analysis for weed content, and match site preparation, planting conditions and follow-up management to your project.
Sources: USDA NRCS, Understanding Pure Live Seed and The Importance of Seed Quality for Natural Resource Conservation.
Weight Conversions lbs. to oz.
Weight Conversions lbs. to oz.
0.01 pounds = 0.16 ounces
- 0.1 pounds = 1.6 ounces
- 0.25 pounds = 4 ounces
- 0.5 pounds = 8 ounces
- 0.75 pounds = 12 ounces
- 1.00 pounds = 16 ounces
Great St. John's wort produces tall, branching flowering stems in midsummer. Moist ground suits its robust growth across loamy, clay-rich, or rocky soil.
For Hypericum ascyron, choose full sun to light shade and moist soil. Recorded habitats include moist to wet river and stream margins; Alder thickets; Sphagnous sedge meadows; Marsh and swamp edges; Wet meadows; Mesic forest margins. Reported height: 3-5 ft.
Growth habit: rhizomatous perennial often forming small colonies. Allow space for this growth between neighboring plants over several seasons, rather than spacing only for the size of a young plant.
Plant specifications
Key growing facts
| Sunlight | Full sun to light shade |
|---|---|
| Soil moisture | Moist |
| Height | 3-5 ft |
| Bloom season | Mid-summer |
Show / hide ▾Growing & planting details
| Growth habit | Rhizomatous perennial often forming small colonies |
|---|---|
| Root form | Rhizomes |
| Soil pH | 5.7–7.1 |
| Drought tolerance | Low |
| Salt tolerance | None |
Plant identification & seed reference
| Botanical name | Hypericum ascyron |
|---|---|
| Other common names | great st johns wort |
| Seed germination | USDA lists cold stratification as required; duration is not specified. |
| Plant family | Hypericaceae |
| Seeds per pound — reference estimate | 1800000 |
Planting, growth & seasonal care
Flowering season: mid-summer. Use this timing when planning seasonal interest with the other plants in the bed.
Drought tolerance is rated low.
Seed preparation: USDA lists cold stratification as required; duration is not specified.
Use the selected product option to confirm the supply format and quantity. For a mixed planting, calculate the order from the actual species and layout; a plant’s mature height alone does not determine a seed rate or plug spacing.
Show / hide ▾Plant communities & associatesNo verified list yet
A species-level list has not yet been verified for this listing.
Show / hide ▾Native range & C-value
State nativity describes a broad range. Use the Chicago-region assessment for local context; a state listing does not establish county nativity.
| Wetland indicator — NWPL 2022 Midwest | FAC |
|---|---|
| C-value — Chicago region, Flora 2017 | 10 |
| Chicago-region native — Flora 2017 | Yes |
| Native range — U.S. states | Connecticut; Illinois; Indiana; Iowa; Kansas; Maine; Maryland; Massachusetts; Michigan; Minnesota; Missouri; New Hampshire; New York; Ohio; Pennsylvania; Vermont; Wisconsin |
| County nativity | Not yet verified; occurrence records do not establish nativity. |
Regional assessment notes
This taxon is native to parts of the United States. Flora of the Chicago Region (2017) also records this taxon as native in the Chicago region.
These records describe botanical distribution. They do not establish county occurrence or suitability for every site; an unlisted state is not proof of absence.
Show / hide ▾Pollinators & wildlife
Caterpillars recorded on Hypericum — genus-level evidence
These records concern the plant genus Hypericum, not necessarily Hypericum ascyron. They do not establish a host relationship for every species in the genus, specialist status, or occurrence at your location. The selected insects are listed as native in the source’s North American study area.
Macromoth: Alastria chico; Cryptocala acadiensis (Catocaline Dart); Eupithecia miserulata (Common Eupithacia, Common Pug); Eupithecia subfuscata (Gray Pug, Subfuscate Pug, The Brown-grey Pug); Hyppa xylinoides (Common Hyppa); Iodopepla u-album (Burgundy St. Johnswort Moth, White-Eyed Borer); Iridopsis ephyraria (Pale-Winged Gray); Melanchra assimilis (Black Arches); Mocis latipes (Small Mocis, Striped Grass Looper); Nedra stewarti; Nemoria bistriaria (Two-Striped Emerald, Red-Fringed Emerald); Nemoria tuscarora (Appalachian Emerald); Phlogophora iris (Olive Angle Shades); Probole amicaria (Friendly Probole); Synchlora aerata (Wavy-Lined Emerald, Camouflaged Looper); Xestia c-nigrum (Spotted Cut-Worm, Setaceous Hebrew Character, Lesser Black-letter Dart); Zale lunata (Lunate Zale); Zosteropoda hirtipes (V-Lined Quaker).
Micromoth: Acleris aenigmana; Acleris maculidorsana (Stained-Back Leafroller Moth); Agonopterix nubiferella; Caloptilia hypericella; Choristoneura rosaceana (Oblique-Banded Leafroller Moth, Rosaceous Leaf Roller); Coleotechnites nigritus; Dejongia lobidactylus (Lobed Plume Moth); Fomoria hypericella; Platynota flavedana (Black-Shaded Platynota); Sparganothis senecionana; Sparganothis sulfureana (Sparganothis Fruitworm Moth, Sulfur Leafroller, False Yellow-Head); Tallula watsoni (Watson's Tallula); Xenotemna pallorana.
Show / hide ▾Frequently asked questions
What are the ideal growing conditions for Great St. John's Wort?
Light: Full sun to light shade. Soil moisture: Moist.
How do I germinate and establish Great St. John's Wort from seed?
USDA lists cold stratification as required; duration is not specified.
Is Great St. John's Wort deer and herbivore resistant?
Species-specific deer resistance has not been verified here. Even plants described as resistant may be browsed. Use physical protection where deer damage is a concern.
When should I expect Great St. John's Wort to bloom?
Typical flowering period: Mid-summer. Timing varies with location and weather.
Show / hide ▾Sources & ecological notes
Native range & ecological ratings: Flora of the Chicago Region (2017), via Universal FQA; USACE Chicago FQA (2017); USACE National Wetland Plant List; Kew WCVP / Plants of the World Online.
Growing conditions & other references: Illinois Wildflowers, John Hilty; USDA NRCS PLANTS; Patrick Goggin: Wisconsin native plant guide, p. 75.
Wildlife records: Shropshire & Tallamy: caterpillar hosts (2025).
Native range does not identify the origin of the seed or plants offered. Community and wildlife records apply to the locations and conditions described.
Research notes & credits
USACE/ERDC fqadata — Chicago Region FQA 2017. Herman, B., Sliwinski, R. & Whitaker, S. (2017), Chicago Region FQA Calculator; distributed by USACE/ERDC in fqadata under CC0. Values may differ from Flora of the Chicago Region (2017). CC0 dedication. Retained for comparison; the displayed C-value follows Flora database 80.
U.S. state nativity: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew, 4 June 2026 release, under Hypericum ascyron. © The Trustees of the Royal Botanic Gardens, Kew; CC BY 3.0. Native records selected; introduced, doubtful and extinct records excluded. Kew cannot warrant the quality or accuracy of these data; no endorsement is implied. State nativity is separate from Chicago-region nativity, county occurrence and the origin of nursery stock.
Additional reference: Open Database License 1.0.
Flora rating attribution: Kenneth Johnson (2018), Flora of the Chicago Region UFQA Database, following Gerould Wilhelm and Laura Rericha (2017), Flora of the Chicago Region: A Floristic and Ecological Synthesis. Individual rating facts are presented with original commentary; the calculator’s software license is not treated as a license for the underlying Flora publication.
Data adapted from Shropshire, K.J. & Tallamy, D.W. (2025), Lepidoptera of North America, north of Mexico, supplementary material 1. This selected and reformatted host dataset is available under the Open Database License 1.0. No endorsement implied.
Genus-level research records
These records concern the plant genus. They do not establish that each insect feeds on this particular plant species.
| Record ID | Scientific insect name | Common name | Source group | Plant genus |
|---|---|---|---|---|
| 200617 | Alastria chico | macromoth | Hypericum | |
| 203633 | Cryptocala acadiensis | Catocaline Dart | macromoth | Hypericum |
| 205521 | Eupithecia miserulata | Common Eupithacia, Common Pug | macromoth | Hypericum |
| 205587 | Eupithecia subfuscata | Gray Pug, Subfuscate Pug, The Brown-grey Pug | macromoth | Hypericum |
| 207262 | Hyppa xylinoides | Common Hyppa | macromoth | Hypericum |
| 207381 | Iodopepla u-album | Burgundy St. Johnswort Moth, White-Eyed Borer | macromoth | Hypericum |
| 207391 | Iridopsis ephyraria | Pale-Winged Gray | macromoth | Hypericum |
| 208225 | Melanchra assimilis | Black Arches | macromoth | Hypericum |
| 208422 | Mocis latipes | Small Mocis, Striped Grass Looper | macromoth | Hypericum |
| 208569 | Nedra stewarti | macromoth | Hypericum | |
| 208604 | Nemoria bistriaria | Two-Striped Emerald, Red-Fringed Emerald | macromoth | Hypericum |
| 208630 | Nemoria tuscarora | Appalachian Emerald | macromoth | Hypericum |
| 209920 | Phlogophora iris | Olive Angle Shades | macromoth | Hypericum |
| 210416 | Probole amicaria | Friendly Probole | macromoth | Hypericum |
| 212187 | Synchlora aerata | Wavy-Lined Emerald, Camouflaged Looper | macromoth | Hypericum |
| 212846 | Xestia c-nigrum | Spotted Cut-Worm, Setaceous Hebrew Character, Lesser Black-letter Dart | macromoth | Hypericum |
| 212971 | Zale lunata | Lunate Zale | macromoth | Hypericum |
| 213054 | Zosteropoda hirtipes | V-Lined Quaker | macromoth | Hypericum |
| 200086 | Acleris aenigmana | micromoth | Hypericum | |
| 200124 | Acleris maculidorsana | Stained-Back Leafroller Moth | micromoth | Hypericum |
| 200547 | Agonopterix nubiferella | micromoth | Hypericum | |
| 202139 | Caloptilia hypericella | micromoth | Hypericum | |
| 202939 | Choristoneura rosaceana | Oblique-Banded Leafroller Moth, Rosaceous Leaf Roller | micromoth | Hypericum |
| 203315 | Coleotechnites nigritus | micromoth | Hypericum | |
| 203870 | Dejongia lobidactylus | Lobed Plume Moth | micromoth | Hypericum |
| 206042 | Fomoria hypericella | micromoth | Hypericum | |
| 210196 | Platynota flavedana | Black-Shaded Platynota | micromoth | Hypericum |
| 211605 | Sparganothis senecionana | micromoth | Hypericum | |
| 211607 | Sparganothis sulfureana | Sparganothis Fruitworm Moth, Sulfur Leafroller, False Yellow-Head | micromoth | Hypericum |
| 212259 | Tallula watsoni | Watson's Tallula | micromoth | Hypericum |
| 212831 | Xenotemna pallorana | micromoth | Hypericum |
Growing guidance: Illinois Extension — Keeping deer out of the yard and garden. Selected facts in original wording. General deer advice is not a species resistance rating.
Plant Shipping & Care
Plant Shipping & Care
We want to ensure that our customers get what they want, a native backyard oasis. To do that, we need to follow a few simple guidelines and give you some information and pointers to make sure you get your plants delivered in a healthy state.
As a reminder, you will receive an email to confirm your pickup or shipping window just before the plants are ready. See Order Fulfillment below for seasonal fulfillment windows.
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Order Fulfilment - When Your Plants or Other Items Will Be Ready
We take orders all year long and seed is shipped all year, but we only provide the plants to you in certain fulfillment windows to ensure healthy plants.
Wholesale Orders
- Shipped or are Ready For Pick Up As Requested.
Retail & Website Orders
- Seed Typically Ships Out Within One Week Of Order All Year Long
- Typically, single species flats ship when ready, sometimes as soon as early to mid-April (depends on weather) through early-October.
- Mixed species kits are batched and shipped as indicated on the product page.
- If a plant order is placed while outside of the plant fulfillment window your plants will be reserved through your payment, however, the order will not be fulfilled and shipped until the following spring. We don't want to provide you plants when they won't be happy during the cold winter months.
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Where We Ship
What to Expect When Receiving Your Delivery
- Your plants will be packaged with the utmost care
- We will need to cut back certain plants prior to shipping. This seems counter-intuitive, however, the fewer leaves the less water the plants can lose during shipping, resulting in healthier plants for you. This also enables the plants to fit within the protective packaging and shipped safely.
Shipments
- Larger plant shipments will look similar to the picture below with a tray of your plants and a cardboard box to protect them during shipping.
What to Do With Your Plants After Receiving Your Delivery
- Unpack your order IMMEDIATELY
- Inspect for damage and report any issues immediately to Natives@NaturalCommunities.net
- Water your plants
- Install your plants as quickly as possible and water the entire garden area thoroughly
- If you cannot install your plants immediately
- Some plants may not be in a container, put them into some kind of a container such as a paper cup with loose soil until installation
- Make sure each plant is receiving the appropriate amount of light.
- Continue to water daily each morning and possibly again in the afternoon
- No additional fertilizer is needed
Seed Shipping & Care
Seed Shipping & Care
Seed ships all year and typically ships within a week of an order being placed.
We have attempted to put together some basic information regarding native seed installation, establishment, and maintenance. We hope you find it helpful. If you need further assistance on native seed establishment, please schedule a free consolation call here.
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