Within M’Mahon’s lifetime, he became especially known for his championing of [[hedge]]s as live fences, and his calendar may have helped popularize them wherever it was read. <span id="Aurora1816_cite"></span> In 1816, his obituary singled out his innovative approach to planting “Quickset [[hedge]]s” from European white thorn (''Crataegus laevigata''), based on observation of the weathering and germination of Hawthorn seeds in the wild ([[#Aurora1816|view text]]). As Brenda Bullion points out, M’Mahon himself understood these live fences as a response to the deforestation of the American countryside, recommending them “particularly in those parts of the Union in which timber has got scarce, and must inevitably become more so in a very rapid progression.”<ref>Bullion 1990, 304–5, [https://www.zotero.org/groups/54737/keywords_in_early_american_landscape_design/items/itemKey/9XGG8N2W/q/brenda%20bullion view on Zotero].</ref> Here, as elsewhere, his ''Calendar'' had both practical and aesthetic implications for the development of American landscape design.
Landscape design principles formed a small but significant part of the book’s content, and in 1841, the landscape gardener [[A.J. Andrew Jackson Downing]] described the ''American Gardener’s Calendar'' as the “only American work previously published which treats directly of landscape gardening.”<ref> A. J. Downing, ''A Treatise on the Theory and Practice of Landscape Gardening, Adapted to North America; with a View to the Improvement of Country Residences... with Remarks on Rural Architecture'' (New York: Wiley & Putnam, 1841), 20, [https://www.zotero.org/groups/54737/keywords_in_early_american_landscape_design/items/itemKey/PGUEKHNG? view on Zotero].</ref> Squeezed into the month of January, M’Mahon’s introductory overview of “The [[Pleasure ground/Pleasure garden|Pleasure]], or [[Flower Garden]]” quotes extensively from ''The Universal Gardener and Botanist'' by John Abercrombie.<ref>See the entry on Pleasure-Garden in the 1778 and, even more similar, 1797 editions of Thomas Mawe and John Abercrombie, ''The Universal Gardener and Botanist, or A General Dictionary of Gardening and Botany'' (London: Printed for G. Robinson et al, 1778), [https://www.zotero.org/groups/54737/keywords_in_early_american_landscape_design/items/itemKey/ID3XI7NM/q/abercrombie view on Zotero].</ref> This overview effectively popularized a design vocabulary drawn from earlier English works for American audiences, employing terms for plantings like [[lawn]], [[hedge]], and [[parterre]]; architectural elements such as [[temple]], pyramid, and [[obelisk]]; and earthworks including [[slope]], [[terrace]], and [[eminence]].<ref>M’Mahon 1806, 55–69, [https://www.zotero.org/groups/54737/keywords_in_early_american_landscape_design/items/itemKey/HU4JIS9C/q/m'mahon view on Zotero].</ref> M’Mahon’s taste and those of his sources subtly shaped this vocabulary. <span id="Modern_cite"></span>He expressed a preference for the “[[Modern style/Natural style|modern]] garden” in imitation of nature rather than the “too formal works” that characterized the [[Ancient style]] ([[#Modern|view text]]).<ref>M’Mahon 1806, 66 (perspective), 55–56 (modern garden), [https://www.zotero.org/groups/54737/keywords_in_early_american_landscape_design/items/itemKey/HU4JIS9C/q/m'mahon view on Zotero].
</ref> <span id="Variety_cite"></span>Lifting passages from Abercrombie’s ''Universal Gardener and Botanist'' verbatim, he advocated variety in garden design, rather than single-minded adherence to any individual design principle ([[#Variety|view text]]).
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