Here are some plants grown
usually as ornamentals that bear yummy edible parts:
Begonia—
Begonia (the flowers are delicious and lemony)
Elaeagnus—
Elæagnus multiflora, E. umbellata (berries)
Elder, European Black—
Sambucus nigra (berries; fried flowers)
Elephant Grass—
Portulacaria afra (leaves taste like sorrel)
Ice Plant—
Delosperma Cooperi (leaves raw, though bland)
Mulberry, Weeping White—
Morus alba 'Pendula' (berries)
Nasturtium—
Tropaeolum tuberosum (leaves and tubers)
Orangebark Myrtle—
Luma apiculata =
Myrtus Luma (berries)
Pansy—
Viola tricolor and hybrids (flowers taste wonderful)
Prickly Pear—
Opuntia phaeacantha (young pads except for the spines; flowers; fruits)
Quail Bush—
Atriplex Breweri (leaves raw)
Society Garlic—
Tulbaghia violacea (leaves and flowers)
Sea Kale—
Crambe maritima and
C. cordifolia (leaves, leaf stems)
Serviceberry—
Amelanchier spp. (berries; some cultivars are fruitful, some not)
Sorrel, Garden—
Rumex scutatus (leaves raw; 'Silver Shield' is the common clone)
Thyme, Doone Valley—
Thymus citriodorus 'Doone Valley' (young tender stem tips)
Wintergreen—
Gaultheria procumbens (berries and young tender leaves)
Whole
books exist about "edible ornamentals" and edible landscaping. If people really desire much fresh plant food, then
all kinds are needed: ornamentals, crop species, weeds and
natives. People tend to categorize plants by the
main use. My salads often contain over 100 species.
Arthur Lee Jacobson