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PlantFiles: Rockery St. John's Wort
Hypericum polyphyllum

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Family: Clusiaceae
Genus: Hypericum (hy-PER-ee-kum) (Info)
Species: polyphyllum (pol-ee-FIL-um) (Info)

Category:
Alpines and Rock Gardens

Height:
12-18 in. (30-45 cm)

Spacing:
18-24 in. (45-60 cm)

Hardiness:
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Full Sun

Danger:
Unknown - Tell us

Bloom Color:
Bright Yellow

Bloom Time:
Mid Summer
Late Summer/Early Fall

Foliage:
Evergreen
Blue-Green
Smooth-Textured

Other details:
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
6.6 to 7.5 (neutral)

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost
From seed; direct sow after last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

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to view:

By Baa
Thumbnail #1 of Hypericum polyphyllum by Baa

By Baa
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By growin
Thumbnail #3 of Hypericum polyphyllum by growin

Profile:

1 positive
1 neutral
No negatives

Gardeners' Notes:

RatingAuthorContent
Positive MN_Darren On Jun 9, 2005, MN_Darren from Saint Paul, MN wrote:

Easy to grow. Mine has a very nice shape, and it's a fairly unique looking plant. It survived a particularly nasty winter in flying colors. I deadheaded it last year and it did not spread at all from the roots, so I'd say that it's pretty well-behaved too.

Neutral Baa On Oct 31, 2001, Baa wrote:

An evergreen subshrub with linear-ovate, opposite, glaucus leaves held on erect stems. Bears 1 inch, bright butter yellow, flowers with many stamens looking a little like a golden powder puff. The flowers always look a little too big to belong to the plant!

Flowers June-August.

Likes a well drained, neutral soil in full sun where it will happily spread about if allowed.

Give a light trim after flowering if required.

Regional...

This plant has been said to grow in the following regions:

Lincoln, Illinois
Saint Paul, Minnesota



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