As early as 1787, Americans recognized the alcove as a distinct garden feature that could follow one of two types: an ornamental building in a garden or a recessed niche cut into live plant material. As a garden building, an alcove could be a freestanding or semidetached structure, typically possessing three sides and housing a seat. Alcoves provided shelter from the sun in summer but were particularly welcome in the northern winter, since they were often enclosed against the winds and open to the sun.
As sheltered sun-catchers, alcoves were logical appendages to bathhouses as indicated in Samuel Vaughan's 1787 plan of Berkeley Springs, Va. (later W.Va.) [Fig. 1]. Like other garden buildings, such as summerhouses and pavilions, alcoves provided shade and gave visual and physical structure to the garden by serving "as terminations to grand walks," as Eliza Caroline Burgwin Clitherall (active 1801) (view citation) and Bernard M’Mahon (1806) (view citation) both explained. Alcoves, situated at the end of long walks or avenues, created visual focal points and secluded destinations for people using the garden [Fig. 2].
When conceived as a recessed niche, an alcove was typically set into or cut out of densely planted vegetation, such as privet. Alexander Walsh’s 1841 account of diminutive alcoves exemplifies this second type (view citation). In Walsh’s plan, the alcoves act as portals between the ornamental pleasure ground and compartments devoted to flowers and culinary vegetables [Fig. 3] (see also M'Mahon 1806). These portals were elevated, much like those described in the Horticultural Register of 1837, and thus provided both enclosure and privacy as well as a vantage point from which to view the landscape (view citation).
-- Anne Helmreich
- Constantia [pseud.], June 24, 1790, describing Gray's Garden, Philadelphia, Pa. (Massachusetts Magazine 3: 415) 
- "At every turn shaded seats are artfully contrived, and the ground abounds with arbours, alcoves, and summer houses, which are handsomely adorned with odoriferous flowers. Among these the little federal temple claims the principal regard. It is the very edifice, that upon the celebration of the ratification of the constitution, was carried in triumphant procession through the streets of this metropolis; and, upon a gentle acclivity, upon the summit of a green mound infixed, it hath now obtained a basis. It is a Rotunda, its cupola is supported by thirteen pillars handsomely finished; their base, is to receive the cypher of the several states, which they represent, with a star upon every capital, and its top is crowned with the figure of Plenty grasping the cornucopia and other insignia. The ascent to this Temple is easy, and we gain it by the semicircular steps neatly turned, and the view therefrom is truly interesting."
- Clitherall, Eliza Caroline Burgwin, active 1801, describing the Hermitage, seat of John Burgwin, Wilmington, N.C. (quoted in Flowers 1983: 126),  back up to history
- "These [gardens] were extensive and beautifully laid out. There was alcoves and summer houses at the termination of each walk, seats under trees in the more shady recesses of the Big Garden, as it was called, in distinction from the flower garden in front of the house."
- Walsh, Alexander, February 1, 1841, "Remarks on Ornamental Gardening" (New England Farmer 19: 309),  back up to history
- "diminutive rustic alcoves, from thrifty growing plants of upright privet, Ligustrum strictum, formed by placing a platform of light boards 2 ft. 6 in. from the ground, and 3 ft. long, and 1 ft. 6 in. wide, on the twigs of the privet; those in the centre of the platform to be trimmed off close to it under side, and those on the back and sides to be led up round the platform, entwined and arched; the door to be constructed from the twigs in front, and an opening left 2 ft. 6 in. high, which is the height of the dome." [Fig. 3]
- "In some spacious pleasure-grounds various light ornamental buildings and erections are introduced, as ornaments to particular departments; such as temples, bowers, banquetting houses, alcoves, grottos, rural seats, cottages, fountains, obelisks, statues, and other edifices; these and the like are usually erected in the different parts, in openings between the divisions of the ground, and contiguous to the terminations of grand walks, &c.
- "Some of these kinds of ornaments, however, being very expensive, are rather sparingly introduced . . . other parts present alcoves, bowers, grottos, rural-seats, &c. at the termination of different walks."
- "1810. Alcoves . . . are used as winter resting places, as being fully exposed to the sun." [Fig. 4]
- Anonymous, April 1, 1837, "Landscape Gardening" (Horticultural Register 3: 129),  back up to discussion
- "Architectural and other ornaments may be introduced, according to the means of the proprietor. When properly distributed they add much to the effect. Seats and arbors should be placed at points affording interesting views, alcoves and rotundas on eminences, and hermitages in secluded places."
- John J. Thomas|Thomas, John J., January 1842, "The Garden and the Orchard" (The Cultivator 1: 22) 
- "The two finest views are seen after entering the house;… The view from the dining room is towards the garden. Directly beneath is the parterre, or flower beds cut into the turf on the lawn, at k; beyond this is the light archway gate to the garden, through which the view extends along the vista formed by flower beds, h h, and terminates at the green house, (or alcove), at m." [Fig. 5]
- "ALCOVE, is a seat in a recess, formed of stone, brick, or other dead material, and so constructed as to shelter the party seated from the north and other colder quarters, whilst it is open in front to the south."
- AL'COVE, AL-COVE, n. [Sp. alcoba, composed of al, with the Ar. . . . kabba, to arch, to construct with an arch, and its derivatives, an arch, a rounded house; Eng. cubby.] . . .
- "3. A covered building, or recess, in a garden.
- "4. A recess in a grove."
- Anonymous, February 1848, "Hints and Designs for Rustic Buildings" (Horticulturist 2: 364) 
Samuel Vaughan, Plan of Bath (Berkeley Springs) Va., 1787, from the diary of Samuel Vaughan, June - September 1787. In the plan to the right, the notation "cc" denotes three alcoves with seats, positioned between dressing rooms ("b") and two long narrow piazzas ("bb").
J. C. Loudon, "Alcoves," in An Encyclopaedia of Gardening (1826), p. 356, fig. 331.
J. C. Loudon, "Rustic Alcove," Cheshunt Cottage, in The Gardener's Magazine 15, no. 117 (December 1839): p. 644, fig. 160.
Alexander Walsh, "Plan of a Garden," in New England Farmer 19, no. 39 (Mar. 31, 1841): 308. The notation "OO" near the juncture of the curved and straight paths (marked by "A"), designates "diminutive rustic alcoves" shaped from live privet, Ligustrum strictum, that would have been constructed on top of a slightly raised platform.
Anonymous, "A Rustic Alcove," in A. J. Downing, ed. Horticulturist 2, no. 8 (February 1848): pl. opp. p. 345, fig. 4.
- Constantia, "Description of Gray’s Gardens, Pennsylvania," Massachusetts Magazine 3 (June 1790): 413–17, view on Zotero.
- John Flowers, "People and Plants: North Carolina’s Garden History Revisited," Eighteenth Century Life 8, no. 2 (January 1983): 117–29, view on Zotero.
- Alexander Walsh, "Remarks on Ornamental Gardening, With a Plan of a Fruit, Flower and Vegetable Garden," New England Farmer, and Horticultural Register 19, no. 39 (March 31, 1841): 308-09, view on Zotero.
- Bernard M'Mahon, The American Gardener’s Calendar: Adapted to the Climates and Seasons of the United States. Containing a Complete Account of All the Work Necessary to Be Done... for Every Month of the Year.... (Philadelphia: Printed by B. Graves for the author, 1806), view on Zotero.
- J. C. (John Claudius) Loudon, An Encyclopaedia of Gardening; Comprising the Theory and Practice of Horticulture, Floriculture, Arboriculture, and Landscape-Gardening, 4th ed. (London: Longman et al, 1826), view on Zotero.
- Anonymous, "Landscape Gardening," The Horticultural Register, and Gardener's Magazine 3 (April 1, 1837): 121-31, view on Zotero.
- John J. Thomas, "The Garden and the Orchard," The cultivator: a monthly publication, devoted to agriculture 9, no. 1 (January 1842): 22, view on Zotero.
- George William Johnson, A Dictionary of Modern Gardening, ed. by David Landreth (Philadelphia: Lea and Blanchard, 1847), view on Zotero.
- Noah Webster, An American Dictionary of the English Language... Revised and Enlarged by Chauncey A. Goodrich.... (Springfield, Mass.: George and Charles Merriam, 1848), view on Zotero
- Anonymous, "Hints and Designs for Rustic Buildings," The Horticulturist and journal of rural art and rural taste 2, no. 8 (February 1848): 363-65, view on Zotero.