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Black walnuts are allelopathic. They produce juglone, a substance toxic to other plants. They do this to reduce competition for water, soil nutrients and sunlight. Not all plants are susceptible to the toxins produced by walnut trees.

Several related trees such as English walnut, hickories and pecan also produce juglone, but in smaller amounts compared to black walnut. Additional common landscape trees with allelopathic properties: sugar maple, tree-of-heaven, hackberries, southern waxmyrtle, American sycamore, cottonwood, black cherry, red oak, black locust, sassafrass, and American elm.

Following are plants that are not damaged by juglone, and will therefore grow successfully under and around walnut trees.
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Acer palmatum 'Bloodgood'
#1 gal. container: $30.00

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Probably the best known Japanese maple cultivar, this upright growing, large-leaf variety has excellent red color that holds well into summer. Sunlight is beneficial to the color of this tree, but some afternoon relief from sun can make it easier to establish. Matures to a height of 15-18' with an equal spread. It is a faster growing cultivar than many other types.

Larger sizes available in-store or local delivery only — check our downloadable tree and shrub price list.

Acer palmatum 'Butterfly' ('Kocho niskiki' or 'Kocho no mai' - butterfly or type of dancing girl)
#1 gal. container: $30.00

Green, 5-7 lobed leaves are edged in creamy white which is tinged in pink in spring. In fall, white areas turn magenta. Matures to a height of 9-12' with a spread of 6-9'. This dainty, variegated tree requires protection from direct, hot sunlight.
Acer palmatum 'Goshiki Kotohime' (multicolored dwarf old harp)
#2 gal. container: $60.00

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Tiny red, pink, yellow, cream and purple flecks and speckles cover some leaves completely, with other leaves left solid green. A brilliant spring show, with new leaves emerging pink. Summer color fades to solid green. 5 lobed leaves are small compared to other palmatum cultivars, and leaves are slightly crinkled. Trees grow to 8' high with a 4' spread.

Larger sizes available in-store or local delivery only — check our downloadable tree and shrub price list.

Acer palmatum 'Kamagata' (eagle claw maple)
#1 gal. container: $30.00

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Delicate looking but quite hardy growing dwarf tree has 3-5 lobed leaves that turn down at each tip. Lobes are long and narrow, and new spring foliage emerges green with edges of red to rusty red. Summer foliage turns bright, light green and in fall turn shades of yellow and orange with touches of red. Dense growth habit with branches close together, this tree grows to 10' high with a spread of 8-10'.

Larger sizes available in-store or local delivery only — check our downloadable tree and shrub price list.

Acer palmatum 'Orange Dream' (eagle claw maple)
#1 gal. container: $30.00

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Rare to the nursery trade, this narrowly upright, slow growing Japanese maple can be planted as a large shrub or small tree. Striking orange-yellow foliage contrasts over bright green bark. The fall foliage and older leaves are gorgeous yellow.

Larger sizes available in-store or local delivery only — check our downloadable tree and shrub price list.

Acer palmatum 'Sango Kaku' (coral bark Japanese maple - coral tower)
#1 gal. container: $30.00

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Brilliant, neon orange bark glows in winter amidst evergreen and snow! 5-7 lobed leaves emerge red, fading to bright green for summer and golden-apricot fall foliage. Upright habit, growing 18' tall with a spread of 10-12'.

Larger sizes available in-store or local delivery only — check our downloadable tree and shrub price list.

Acer palmatum 'Sharps Pygmy'
#1 gal. container: $30.00

An especially dwarf growing, compact tree maturing to only 3'. Small, narrow leaves are green through summer, turning to brilliant scarlet-orange in fall.
Acer palmatum 'Shishigashira' (lion's head Japanese maple)
#2 gal. container: $60.00

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Bright green, tightly curled leaves grow densely along branches on this dwarf, upright growing tree. Fall foliage is gold with red. Trees grow to 15' high and 10' wide.

Larger sizes available in-store or local delivery only — check our downloadable tree and shrub price list.

Acer palmatum 'Tobiosho'
#1 gal. container: $30.00

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A broad, upright habit with a dense green canopy spring through summer. Fall foliage is a brilliant show of color — gold appears first and changes to orange, then scarlet until the tree becomes a multicolor display. The entire tree turns bright scarlet by late fall.

Larger sizes available in-store or local delivery only — check our downloadable tree and shrub price list.

Acer palmatum 'Ukigumo' (floating clouds)
#3 gal. container: $175.00

Variegated cultivar with green and white mottled foliage with slight pink shading on some leaves. Coloring is soft and subtle, with an occasional leaf of pure white. Very slow growing dwarf trees grow 6-9' high.