Bugleweed

This low-growing, creeping evergreen groundcover is one of the few that tolerates dry shade. With adequate moisture, bugleweed rapidly carpets the ground with showy green or multicolor foliage. But be careful where you plant it because it can invade lawns.
Other common names:
bugle, blue bugle, bugleherb, brown bugle, carpetweed, carpet bungleweed,, carpenter's herb, middle compound, middle consound, yellow bugle
Botanical name: Ajuga reptans
Synonyms: Ajuga repens
Family: Mint Family – Lamiaceae (Labiatae)

Sunlight:
part shade, full shade
May tolerate direct sun for part of the day if moisture is adequate, but excessive sun may scorch plants

Soil conditions:
requires well-drained soil, tolerates low fertility
Will grow in poor soils.

Hardiness zones: 3 to 9
May be only marginally hardy in Zone 3.

Lifecycle: perennial

Ease-of-care: easy
This plant is easy to grow, but may pose a management issue if spreading needs to be limited.

Height: 10-15 cm / 4-6 inches
Height is for plants not in flower. Flower stems may rise up to 6" above foliage.

Spread: 30-45 cm / 12-18 inches
Can continue spreading by underground stolons, even invading lawn.

Time to ultimate height: 2-5 years

Bloom time: late spring, early summer

Flower color: blue, indigo, violet, white, pink
Most have deep blue blooms, but some cultivars have white, pink or purple flowers.

Foliage color: medium green, dark green, variegated
The foliage may be medium to deep green, tinted with purple, maroon, or bronze, or multicolor, varying with individual cultivars. Purple-leaved plants are generally most heat and cold tolerant.

Tolerates: heat
Purple leaved plants are generally most heat and cold tolerant.

Special characteristics:
    deer resistant
    aggressive - Can spread into garden areas and lawn if not contained.
    non-invasive
    not native to North America - Native to Europe, Iran and Caucasus Mountains.
    evergreen

Cultivation:
Good ground cover plant, although may be considered invasive. Will scorch in full sun. Will tolerate poor soils
How to plant:
Propagate by cuttings, division or separation - Divide or take cuttings in early summer after flowering has ceased.
Maintenance and care:
This plant may invade lawns if not kept in check. Can be difficult to eliminate from garden once established. Deadhead to reduce spread by seed and to maintain best foliage quality. Allow good air circulation, and thin plants if overly crowded to reduce risk of rot.
Suggested planting locations and garden types:
Banks and Slopes Low Maintenance Flower borders and beds Ground Cover Cottage & Informal Garden Wildflower meadow Wildlife Gardens
Pruning: No pruning required
Diseases:
    Fungal root rot
    Southern blight
    Crown rot
    Fungal leaf spot
    May suffer from powdery mildews

Arctic Fox

Atropurpurea

Catlin's Giant

Dixie Chip

Toffee Chip

'Binblasca' Black Scallop

Genevensis

Golden Glow

Pink Elf

'Braunherz'

Silver Beauty

Mahogany

Sparkler

Burgundy Glow

Rainbow (Multicolor)

Variegata

Golden Glow

Party Colors

Varieties
    http://www.perennials.com/results.html?findplant=Ajuga
http://www.bhg.com/gardening/plant-dictionary/perennial/ajuga/
http://www.perennialresource.com/encyclopedia/view/?plant=23
http://www.gardeningknowhow.com/ornamental/foliage/ajuga/ajuga-bugleweed.htm
http://www.crocus.co.uk/plants/_/ajuga-reptans-atropurpurea/classid.218/

Sources:
www.gardening.cornell.edu
https://www.rhs.org.uk/
http://www.perennials.com 
missouribotanicalgarden.org/

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http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=b200
http://www.arkive.org/bugle/ajuga-reptans/