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Gardening on the Rocks

Perennial Plantings for Stony Sites

Whether your home is situated on rocky terrain or you just want to try your hand at rock gardening getting plants to thrive requires a few basic considerations. Because of the relatively shallow pockets of soil, water drains away very quickly, for better or worse. The most exposed and shallow places are excellent sites for planting drought-tolerant creeping or trailing plants, especially where they can cascade over a ledge. Many of these perennials are beautiful bloomers, so you can have mounds of color throughout your rock garden. On the other hand, plants that like a little more moisture will be happy at the base of a stone wall or terrace, where water will not drain or evaporate so quickly. Perennials that like lean - rather than fertile – soil are the best choices for this type or gardening, unless you wish to add amendments to certain planting areas. The plants suggested on this plan are sun-lovers, so if your rocky site is in a woodland or other shady area, we can provide suggestions for substitutes. Since every rock garden is a unique setting, the design offered here can be adapted to your particular site. Plant one of each variety for a small space, or fill in with more if the area is larger.

           
A Ajuga 'Catlin's Giant'
Larger leafed with mahogany-bronze foliage,and bright blue flowers on short spikes through spring. Height 8-10" Durable to -40°F
I Oenothera missouriensis
Low-growing and sprawling with yellow, fragrant flowers opening from red buds at the end of the day. Height 10" Durable to -40°F
B Aquilegia 'Blue'
Lovely planted into secret nooks and crannies or between rock crevices. Height 6" Durable to -40°F
J Pennisetum 'Little Bunny'
Dark green foliage forms dense, low mounds, and short fluffy flower heads appear in summer. Height 8-12" Durable to 0°F
C Campanula 'Joan Elliott'
Long-blooming, floriferous variety with a tidy, mounding habit and charming blue blossoms. Height 15-18" Durable to -40°F
K

 

Phlox 'Emerald Blue'
Spreading, matted form creates a carpet of emerald-blue flowers. Height 6" Durable to -40°F
D Coreopsis 'Moonbeam'
Lacy foliage and soft-yellow, star-shaped flowers. Excellent for a border, blooming all summer long. Height 18-24" Durable to -40°F
 
L

 

Potentilla 'Miss Willmott'
A strawberry-like potentilla with compact fuzzy mats and loose clusters of cherry-pink blossoms. Height 12" Durable to -20°F
E Delosperma cooperii
Splendidly showy flowers will tumble over rock walls, and are showcased by rich green, dense foliage. Height 4" Durable to 0°F
M

 

Santolina 'Nana'
An aromatic herb with silvery-gray foliage and yellow, globe-shaped flowers. Height 12" Durable to 0°F
F Euphorbia polychroma
Deep green, oval leaves form mounds. Each stem ends in a cluster of yellow bracts surrounding the tiny "true" flowers. Height 18" Durable to -30°F
N  Scabiosa 'Butterfly Blue'
Lavender-blue flowers are delightfully showy, easily grown, long-blooming, and prolific. Height 18" Durable to -40°F
G Gaura 'Corrie's Gold'
Variegated with broad margins of bright yellow on the narrow leaves. Pale pink flowers are profuse. Height 24-36" Durable to -10°F
O Sedum 'Tricolor'
A low, creeping variety with variegated leaves of green, cream, and pink in tight rosettes trailing from short stems. Height 2-4" Durable to -40°F
H Iberis 'Purity'
A cultivar with larger flowers over a longer period of time, and a more compact habit. Height 8-10" Durable to -40°F
P Veronica 'Red Fox'
Glossy rich green leaves and rose-pink blooms on long-lasting spikes. Height 10" Durable to -40°F

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