Check out our "Show the Bees some love" tins - perfect Valentine's gifts

Home » Perforate St John's Wort - Hypericum perforatum - Wildflower

Perforate St John's Wort - Hypericum perforatum - Wildflower

Perforate St John's Wort - Hypericum perforatum - Wildflower
Type: Perennial
Approximate height: Variable 30 to 90 cm
Flowering Time: June to September
Site and soil type: Any reasonable soil in sun or semi-shade
When to sow: Early to late spring and late summer / autumn
Where to sow: Outside, direct into soil or under cover, into trays, modules or pots.
Packet contents: Approximately 3000 seeds / 0.3 g

The leaves of Perforate St. John's Wort contain tiny translucent dots which can be seen if they are held up to light.

The pretty star-shaped flowers are golden yellow and popular with various pollinators including bumblebees and moths.

Warning: Perforate St. John's Wort contains a toxin which is activated by bright sunlight so is best avoided in grassland/gardens where animals graze.

Perforate St John's Wort provides food for the following creatures: 

  • Bees, including: White-tailed bumblebees and Buff-tailed bumblebees.
  • Moths including: Bright-line Brown-eye moth  🐛,  Lesser Treble-bar moth 🐛 and Treble-bar moth  🐛 
  • 🦇
  • An "RHS Plants for Pollinators" plant **

All our seed packets include sowing instructions.

Jemima’s Garden seeds are plastic free and reyclable. They’re contained in an inner glassine envelope, (made from pine wood cellulose), and an outer Kraft paper seed packet. Any shipping packaging is also plastic free and recyclable.


Key to symbols:

🐛 A food plant for the caterpillar

🦋 Provides nectar for the adult moth or butterfly

🦇 Listed in: Bat Conservation Trust Encouraging bats, A guide for bat-friendly gardening and living

🦇 (RHS)  Listed in the RHS Plants for Bats list

** RHS Plants for Pollinators. The RHS Plants for Pollinators mark is only given to plants that support pollinating insects. Find out more at

** The Royal Horticultural Society, and its logo, are trade marks of The Royal Horticultural Society (Registered Charity No 222879/SC038262) and used under licence.