Hypericum perforatum

Species

Also called Common St. John's wort, perforate St. Johns-wort, St. John's wort

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Hypericum perforatum
Photo: Didier Descouens · CC BY-SA 4.0 · Wikimedia Commons

Fact sheet

every fact quoted from its source
Days to germination10–21 days

“10–21 days” — How to Grow St John's Wort from Seed (Hypericum perforatum) — Complete Guide

Germination temperature59–68 °F

“15–20°C” — How to Grow St John's Wort from Seed (Hypericum perforatum) — Complete Guide

Lightfull sun to partial shade

“Full sun to partial shade” — How to Grow St John's Wort from Seed (Hypericum perforatum) — Complete Guide

Soil pH6.5–7

“Slightly acidic (6.5–7.0), Neutral (7.0)” — How to Care for St. John's wort (Hypericum perforatum)

Hardiness zonesUSDA Zone 3 (−40°C)

“Zone 3(−40°C)” — How to Grow St John's Wort from Seed (Hypericum perforatum) — Complete Guide

PropagationDivision, Seed

“Recommended Propagation Strategy: Division” — Hypericum perforatum (Common St. John's-wort, Goatweed, Klamath Weed, St. Johns Wort) | North Carolina

Ready whenred oil test

“The red oil test: Pinch a flower bud of Hypericum perforatum between your fingers. If it releases a reddish-purple oil that stains your fingers, the plant is ready to harvest.” — How to Grow St John's Wort from Seed (Hypericum perforatum) — Complete Guide

Toxicitynot toxic

“Toxic to Pets & Humans” — How to Care for St. John's wort (Hypericum perforatum)

Pestscommon pests

“Common St John’s Wort. It has long been used in traditional medicines to help treat depression. Even today it is often used as a replacement for expensive and over powerful prescription medications.” — Hypericum Plant Growing & Care Guide for Gardeners

Who grows this

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