We need to raise £10,000 from user donations to get our finances in balance. More >>>

Follow Us:

 

Juglans major - (Torr.)Heller.

Common Name Arizona Walnut
Family Juglandaceae
USDA hardiness 8-11
Known Hazards None known
Habitats Dry rocky ravines and stream beds, 700 - 2300 metres[229].
Range Southern N. America - New Mexico to Arizona.
Edibility Rating    (2 of 5)
Other Uses    (0 of 5)
Weed Potential No
Medicinal Rating    (0 of 5)
Care
Half Hardy Moist Soil Full sun
Juglans major Arizona Walnut


http://commons.wikimedia.org/wiki/User:Bruce_Marlin
Juglans major Arizona Walnut
http://www.forestryimages.org/

 

Translate this page:

You can translate the content of this page by selecting a language in the select box.

Summary


Physical Characteristics

 icon of manicon of lolypop
Juglans major is a deciduous Tree growing to 15 m (49ft 3in) at a fast rate.
It is hardy to zone (UK) 9. It is in flower from May to June, and the seeds ripen from October to December. The species is monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and is pollinated by Wind. The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It prefers moist soil.

Synonyms

J. microcarpa major. J. rupestris major. J. torreyi.

Habitats

Woodland Garden Canopy;

Edible Uses

Edible Parts: Oil;  Seed.
Edible Uses: Oil.

Seed - raw or cooked[257]. The seed is rather small, but it is sometimes eaten[82, 161, 183]. Of little value[177]. The seed is large and sweet[227] with a thick shell[200, 227]. There are about 45 seeds to the pound[227]. The seeds are 25 - 40mm in diameter[229]. An edible oil is obtained from the seed, it tends to go rancid quickly.

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.



None known

Other Uses

Dye;  Herbicide;  Oil;  Rootstock.

This species is sometimes used as a rootstock[183]. A golden brown dye can be obtained from the seed husks[257]. A light brown dye is obtained from the young twigs[257]. Plants produce chemicals which can inhibit the growth of other plants. These chemicals are dissolved out of the leaves when it rains and are washed down to the ground below, reducing the growth of plants under the tree[18, 20, 159]. The roots of many members of this genus produce substances that are toxic to many plant species, especially apples (Malus species), members of the Ericaceae, Potentilla spp and the white pines (certain Pinus spp.)[200]. Wood - this very attractive wood rivals that of J. nigra, the black walnut, in quality[229]. However, the limited range and smaller size of the tree have restricted its use[229].

Cultivation details

Requires a deep well-drained loam and a sunny position sheltered from strong winds[1, 11]. Prefers a slightly alkaline soil[200]. Plants are fast-growing when young[227]. This species is closely related to and sometimes considered to be no more than a sub-species of J. microcarpa[11, 229]. It hybridizes with that species where their ranges overlap[229]. If it is a distinct species then perhaps its correct name should be J. torreyi[11]. Trees produce good crops of seeds every 2 - 3 years in the wild[227]. Natural regeneration is very low because most seeds are consumed by wildlife[229]. Plants are fairly long-lived (to about 400 years) and produce a deep taproot, they are intolerant of root disturbance[1, 11, 229]. Seedlings should be planted out into their permanent positions as soon as possible and given some protection for their first winter or two since they are somewhat tender when young[1, 11]. Flower initiation depends upon suitable conditions in the previous summer[200]. The flowers and young growths can be destroyed by even short periods down to -2°c, but fortunately plants are usually late coming into leaf[200]. Any pruning should only be carried out in late summer to early autumn or when the plant is fully dormant otherwise wounds will bleed profusely and this will severely weaken the tree[200]. Trees have a dense canopy which tends to reduce plant growth below them. We have no specific information for this species, but the roots of several members of this genus produce substances that are toxic to many plant species, especially apples (Malus species), members of the Ericaceae, Potentilla spp and the white pines (certain Pinus spp.)[200]. The leaves of many species also secrete substances that have an inhibitory affect on plants growing underneath them. All in all this is not a very good companion plant[K].

image

The PFAF Bookshop

Plants For A Future have a number of books available in paperback and digital form. Book titles include Edible Plants, Edible Perennials, Edible Trees, and Woodland Gardening. Our new book to be released soon is Edible Shrubs.

Shop Now

Propagation

The seed is best sown as soon as it is ripe in individual deep pots in a cold frame[80]. You need to protect it from mice, birds, squirrels etc. The seed usually germinates in late winter or the spring. Plant out the seedlings into their permanent positions in early summer and give some protection from the cold for their first winter or two. The seed can also be stored in cool moist conditions (such s the salad compartment of a fridge) over the winter and sown in early spring but it may then require a period of cold stratification before it will germinate[78, 80, 113]. Germination rates are usually less than 50%[227].

Other Names

If available other names are mentioned here

Found In

Countries where the plant has been found are listed here if the information is available

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status :

Related Plants
Latin NameCommon NameEdibility RatingMedicinal Rating
Juglans ailanthifoliaJapanese Walnut31
Juglans ailanthifolia cordiformisHeartseed Walnut41
Juglans californicaCalifornia Walnut, Southern California walnut21
Juglans cathayensisChinese Walnut30
Juglans cinereaButternut - White Walnut, Butternut33
Juglans hindsiiHind's Black Walnut, Northern California walnut, Paradox hybrid walnut30
Juglans intermediaHind's Black Walnut, Northern California walnut, Paradox hybrid walnuH30
Juglans mandschuricaManchurian Walnut31
Juglans microcarpaTexas Walnut, Little walnut, Stewart's little walnut20
Juglans neotropicaAndean Walnut32
Juglans nigraBlack Walnut33
Juglans olanchanaOlancho walnut, Central American walnut20
Juglans regiaWalnut, English walnut, Persian Walnut,43
Juglans regia fallaxWalnut30
Juglans regia kamaoniaWalnut33
Juglans sinensis 31
Juglans x bisbyiBuartnut30

 

Print Friendly and PDF

Expert comment

Author

(Torr.)Heller.

Botanical References

1182200

Links / References

For a list of references used on this page please go here

Readers comment

QR Code

What's this?

This is a QR code (short for Quick Response) which gives fast-track access to our website pages. QR Codes are barcodes that can be read by mobile phone (smartphone) cameras. This QR Code is unique to this page. All plant pages have their own unique code. For more information about QR Codes click here.

1. Copy and print the QR code to a plant label, poster, book, website, magazines, newspaper etc and even t-shirts.

2. Smartphone users scan the QR Code which automatically takes them to the webpage the QR Code came from.

3. Smartphone users quickly have information on a plant directly for the pfaf.org website on their phone.

Add a comment

If you have important information about this plant that may help other users please add a comment or link below. Only comments or links that are felt to be directly relevant to a plant will be included. If you think a comment/link or information contained on this page is inaccurate or misleading we would welcome your feedback at admin@pfaf.org. If you have questions about a plant please use the Forum on this website as we do not have the resources to answer questions ourselves.

* Please note: the comments by website users are not necessarily those held by PFAF and may give misleading or inaccurate information.

To leave a comment please Register or login here All comments need to be approved so will not appear immediately.

Subject : Juglans major  
All the information contained in these pages is Copyright (C) Plants For A Future, 1996-2012.
Plants For A Future is a charitable company limited by guarantee, registered in England and Wales. Charity No. 1057719, Company No. 3204567,
Web Design & Management
This work is licensed under a Creative Commons License. Some information cannot be used for commercial reasons or be modified (but some can). Please view the copyright link for more information.