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Useful Temperate Plants

Polemonium caeruleum

L.

Polemoniaceae


The Temperate Database is in the process of being updated, with new records being added and old ones being checked and brought up to date where necessary. This record has not yet been checked and updated.

+ Synonyms

Common Name: Jacob's Ladder

No Image.

General Information

Polemonium caeruleum is a Perennial up to 0.40 metres tall.
It has medicinal uses.

Known Hazards

None known

Botanical References

17
Title
Flora of the British Isles.
Publication
 
Author
Clapham, Tutin and Warburg.
Publisher
Cambridge University Press
Year
1962
ISBN
-
Description
A very comprehensive flora, the standard reference book but it has no pictures.
,
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

Range

Northern and central Europe, including Britain, to Siberia and the Caucasus.

Habitat

Margins of woods and swamps, by streams, especially on turf and usually in limestone hills[
4
Title
A Modern Herbal.
Publication
 
Author
Grieve.
Publisher
Penguin
Year
1984
ISBN
0-14-046-440-9
Description
Not so modern (1930's?) but lots of information, mainly temperate plants.
,
17
Title
Flora of the British Isles.
Publication
 
Author
Clapham, Tutin and Warburg.
Publisher
Cambridge University Press
Year
1962
ISBN
-
Description
A very comprehensive flora, the standard reference book but it has no pictures.
].

Properties

Medicinal Rating *  *
HabitPerennial
Height0.40 m
PollinatorsBees
Cultivation StatusWild

Cultivation Details

A very easily grown plant, it prefers a moist well-drained fertile soil in sun or semi-shade[
1
Title
RHS Dictionary of Plants plus Supplement. 1956
Publication
 
Author
F. Chittendon.
Publisher
Oxford University Press
Year
1951
ISBN
-
Description
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaced in 1992 by a new dictionary (see [200]).
,
111
Title
Popular Hardy Perennials.
Publication
 
Author
Sanders. T. W.
Publisher
Collingridge
Year
1926
ISBN
-
Description
A fairly wide range of perennial plants that can be grown in Britain and how to grow them.
,
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
]. Dislikes damp or heavy soils[
111
Title
Popular Hardy Perennials.
Publication
 
Author
Sanders. T. W.
Publisher
Collingridge
Year
1926
ISBN
-
Description
A fairly wide range of perennial plants that can be grown in Britain and how to grow them.
], though it tolerates alkaline conditions[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.
].
Hardy to at least -20°c[
187
Title
Perennials. Volumes 1 and 2.
Publication
 
Author
Phillips. R. & Rix. M.
Publisher
Pan Books
Year
1991
ISBN
0-330-30936-9
Description
Photographs of over 3,000 species and cultivars of ornamental plants together with brief cultivation notes, details of habitat etc.
].
A polymorphic species, there are several sub-species[
187
Title
Perennials. Volumes 1 and 2.
Publication
 
Author
Phillips. R. & Rix. M.
Publisher
Pan Books
Year
1991
ISBN
0-330-30936-9
Description
Photographs of over 3,000 species and cultivars of ornamental plants together with brief cultivation notes, details of habitat etc.
] and many named forms[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.
].
Plants are fairly short-lived in cultivation unless they are divided regularly and moved to fresh soil[
233
Title
Perennial Garden Plants
Publication
 
Author
Thomas. G. S.
Publisher
J. M. Dent & Sons, London.
Year
1990
ISBN
0 460 86048 8
Description
A concise guide to a wide range of perennials. Lots of cultivation guides, very little on plant uses.
]. They can self-sow to the point of nuisance, however[
187
Title
Perennials. Volumes 1 and 2.
Publication
 
Author
Phillips. R. & Rix. M.
Publisher
Pan Books
Year
1991
ISBN
0-330-30936-9
Description
Photographs of over 3,000 species and cultivars of ornamental plants together with brief cultivation notes, details of habitat etc.
,
200
Title
The New RHS Dictionary of Gardening. 1992.
Publication
 
Author
Huxley. A.
Publisher
MacMillan Press
Year
1992
ISBN
0-333-47494-5
Description
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
] and will also survive when growing in lush grass[
187
Title
Perennials. Volumes 1 and 2.
Publication
 
Author
Phillips. R. & Rix. M.
Publisher
Pan Books
Year
1991
ISBN
0-330-30936-9
Description
Photographs of over 3,000 species and cultivars of ornamental plants together with brief cultivation notes, details of habitat etc.
].
Cats are strongly attracted by the smell of this plant and will frequently roll on it and injure it[
4
Title
A Modern Herbal.
Publication
 
Author
Grieve.
Publisher
Penguin
Year
1984
ISBN
0-14-046-440-9
Description
Not so modern (1930's?) but lots of information, mainly temperate plants.
].

Edible Uses

None known

Medicinal

The herb is astringent and diaphoretic[
4
Title
A Modern Herbal.
Publication
 
Author
Grieve.
Publisher
Penguin
Year
1984
ISBN
0-14-046-440-9
Description
Not so modern (1930's?) but lots of information, mainly temperate plants.
,
61
Title
A Dictionary of Plants Used by Man.
Publication
 
Author
Usher. G.
Publisher
Constable
Year
1974
ISBN
0094579202
Description
Forget the sexist title, this is one of the best books on the subject. Lists a very extensive range of useful plants from around the world with very brief details of the uses. Not for the casual reader.
]. It was formerly used internally in the treatment of a wide range of conditions ranging from headaches to fevers and epilepsy[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.
]. The plant is harvested in the summer and dried for later use[
238
Title
Encyclopaedia of Herbs and their Uses.
Publication
 
Author
Bown. D.
Publisher
Dorling Kindersley, London.
Year
1995
ISBN
0-7513-020-31
Description
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.
].

Other Uses

None known

Propagation

Seed - sow spring in a cold frame[
14
Title
Complete Guide to Herbs.
Publication
 
Author
Holtom. J. and Hylton. W.
Publisher
Rodale Press
Year
1979
ISBN
0-87857-262-7
Description
A good herbal.
]. Another report says that the seed is best sown in a cold frame in the autumn[
188
Title
The RHS Gardener's Encyclopedia of Plants and Flowers
Publication
 
Author
Brickell. C.
Publisher
Dorling Kindersley Publishers Ltd.
Year
1990
ISBN
0-86318-386-7
Description
Excellent range of photographs, some cultivation details but very little information on plant uses.
]. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in the summer.
Division in early spring or early autumn[
111
Title
Popular Hardy Perennials.
Publication
 
Author
Sanders. T. W.
Publisher
Collingridge
Year
1926
ISBN
-
Description
A fairly wide range of perennial plants that can be grown in Britain and how to grow them.
]. Larger divisions can be planted out direct into their permanent positions. We have found that it is better to pot up the smaller divisions and grow them on in light shade in a cold frame until they are well established before planting them out in late spring or early summer.

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