Practical
Plants

Crataegus flava

Summer Haw

a perennial woody deciduous member of the Crataegus genus in the family Rosaceae.

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Taxonomy and growth

Family
Rosaceae
Life cycle
perennial
Foliage
deciduous
Woodiness
woody
Height
8 m
Spread
10 m
Fertility
Midges
Flower type
hermaphrodite
Pollinators
Midges

Uses

Edible uses

This section contains historical Plants For A Future notes marked noncommercial.

Fruit - raw or cooked[11][12][16][2]. well-flavoured[5]. Dry and mealy[15], it is highly esteemed in N. America as a wild fruit gathered for making jellies[4]. The yellow fruit is pear-shaped[9], it is up to 16mm in diameter and is borne in small clusters[8]. There are up to five fairly large seeds in the centre of the fruit, these often stick together and so the effect is of eating a cherry-like fruit with a single seed[K].

Plant part
Fruit

Medicinal uses

Historical medicinal uses. These records describe reported uses. They do not establish safety or effectiveness. Ask a qualified health professional before using any plant medicinally.

This section contains historical Plants For A Future notes marked noncommercial.

Although no specific mention has been seen for this species, the fruits and flowers of many hawthorns are well-known in herbal folk medicine as a heart tonic and modern research has borne out this use. The fruits and flowers have a hypotensive effect as well as acting as a direct and mild heart tonic[7]. They are especially indicated in the treatment of weak heart combined with high blood pressure[7]. Prolonged use is necessary for it to be efficacious[7]. It is normally used either as a tea or a tincture[7].

Product or use
Cardiotonic
Product or use
Hypotensive

Material uses

This section contains historical Plants For A Future notes marked noncommercial.

Wood - heavy, hard, tough, close-grained. Useful for making tool handles, mallets and other small items[15].

Ecology and functions

Ecosystem niche
Secondary canopy

Environment

Range
South-eastern N. America - Virginia to Florida, west to Mississippi.
Habitat
Open woods and low hills in dry sandy or gravelly soils[10][15].
Light
full sun
Shade tolerance
light shade
Water
high
Hardiness
Zone 6+
Soil textures
sandy, loamy, clay, heavy clay
Soil pH
acid, neutral, alkaline, very alkaline
Tolerances
high wind, drought
Wind
Yes
Tolerates Nutritionally Poor Soil
No
Drought
tolerant

Propagation

This section contains historical Plants For A Future notes marked noncommercial.

Seed - this is best sown as soon as it is ripe in the autumn in a cold frame, some of the seed will germinate in the spring, though most will probably take another year. Stored seed can be very slow and erratic to germinate, it should be warm stratified for 3 months at 15°c and then cold stratified for another 3 months at 4°c[3]. It may still take another 18 months to germinate[13]. Scarifying the seed before stratifying it might reduce this time[14]. Fermenting the seed for a few days in its own pulp may also speed up the germination process[K]. Another possibility is to harvest the seed 'green' (as soon as the embryo has fully developed but before the seedcoat hardens) and sow it immediately in a cold frame. If timed well, it can germinate in the spring[14]. If you are only growing small quantities of plants, it is best to pot up the seedlings as soon as they are large enough to handle and grow them on in individual pots for their first year, planting them out in late spring into nursery beds or their final positions. When growing larger quantities, it might be best to sow them directly outdoors in a seedbed, but with protection from mice and other seed-eating creatures. Grow them on in the seedbed until large enough to plant out, but undercut the roots if they are to be left undisturbed for more than two years.

Cultivation

This section contains historical Plants For A Future notes marked noncommercial.

A very easily grown plant, it prefers a well-drained moisture retentive loamy soil but is not at all fussy[1][6]. Once established, it succeeds in excessively moist soils and also tolerates drought[6]. It grows well on a chalk soil and also in heavy clay soils[6]. A position in full sun is best when plants are being grown for their fruit, they also succeed in semi-shade though fruit yields and quality will be lower in such a position[1][6]. Most members of this genus succeed in exposed positions, they also tolerate atmospheric pollution[6]. Hybridizes freely with other members of this genus[6]. Seedling trees take from 5 - 8 years before they start bearing fruit, though grafted trees will often flower heavily in their third year[K]. The flowers have a foetid smell somewhat like decaying fish. This attracts midges which are the main means of fertilization. When freshly open, the flowers have more pleasant scent with balsamic undertones[9]. Seedlings should not be left in a seedbed for more than 2 years without being transplanted[1]. The fruit is sparsely produced in Britain[1]. A tree at Kew in September 1993 was fruiting heavily[K].

References

  1. Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981-00-00

    ↩1↩2↩3↩4

  2. Yanovsky. E. Food Plants of the N. American Indians. Publication no. 237. U.S. Depf of Agriculture.

    ↩

  3. Bird. R. (Editor) Growing from Seed. Volume 4. Thompson and Morgan. 1990-00-00

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  4. Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications 1990-00-00 ISBN 0-9628087-0-9

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  5. Hedrick. U. P. Sturtevant's Edible Plants of the World. Dover Publications 1972-00-00 ISBN 0-486-20459-6

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  6. Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992-00-00 ISBN 0-333-47494-5

    ↩1↩2↩3↩4↩5↩6

  7. Foster. S. & Duke. J. A. A Field Guide to Medicinal Plants. Eastern and Central N. America. Houghton Mifflin Co. 1990-00-00 ISBN 0395467225

    ↩1↩2↩3↩4

  8. Elias. T. The Complete Trees of N. America. Field Guide and Natural History. Van Nostrand Reinhold Co. 1980-00-00 ISBN 0442238622

    ↩

  9. Genders. R. Scented Flora of the World. Robert Hale. London. 1994-00-00 ISBN 0-7090-5440-8

    ↩1↩2

  10. Fernald. M. L. Gray's Manual of Botany. American Book Co. 1950-00-00

    ↩

  11. Uphof. J. C. Th. Dictionary of Economic Plants. Weinheim 1959-00-00

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  12. Usher. G. A Dictionary of Plants Used by Man. Constable 1974-00-00 ISBN 0094579202

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  13. Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948-00-00

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  14. McMillan-Browse. P. Hardy Woody Plants from Seed. Grower Books 1985-00-00 ISBN 0-901361-21-6

    ↩1↩2

  15. Sargent. C. S. Manual of the Trees of N. America. Dover Publications Inc. New York. 1965-00-00 ISBN 0-486-20278-X

    ↩1↩2↩3

  16. Saunders. C. F. Edible and Useful Wild Plants of the United States and Canada. Dover Publications 1976-00-00 ISBN 0-486-23310-3

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