Photo of Dahlia merckii by Far Reaches Farm

Photo by Far Reaches Farm

Used with permission, all rights reserved

Show all photos

Dahlia merckii

Plant type

perennial, bulb / corm / tuber

size

  • H: 3'-6'
  • W: 2'-4'

planting zones

  • 7b-11

More Options

Dahlia merckii plant details

Dahlia merckii is a broadleaf deciduous perennial bulb / corm / tuber with green foliage. In fall and summer lavender flowers emerge. Attracts bees making it an excellent addition to pollinator gardens. Grows well with sun and even moisture - regular water. Does well in average, rich and well-drained soil.

CHARACTERISTICS OF Dahlia merckii

Plant type: perennial bulb / corm / tuber
Plant family: asteraceae
Foliage: deciduous green
Mature size: 2 FT - 4 FT - wide, 3 FT - 6 FT - tall
Flowers: lavender blooms in fall and summer

GROWING CONDITIONS for Dahlia merckii

USDA Zones: 7b - 11
Sun exposure: sun
Watering frequency: even moisture - regular
Soil needs: average, rich and well-drained

Nursery contributed plant descriptions

One of the best of the species for the home garden, this is nicely hardy here and always blooms. While the pale lavender flowers are small - think of the increasingly rare 50 cent piece for comparison - they are held to good effect on long stems to 3' tall and perfectly displayed over precision cut foliage. This is what we think of as a finely honed dahlia with all parts working together in effortless harmony. This is the kind of thing that so often eludes fine design but when it is captured, you know it at a cellular level. This species is a parent of the very classy Dahlia 'Ethereal' which is much admired here and which is in the pipeline!

Gardening facts about Dahlia merckii plant

How to Grow Dahlia merckii

  • Sun Exposure

    • sun
  • Water Needs

    • even moisture - regular
  • Soil Needs

    • average
    • well-drained
    • rich

Features

  • Foliage Color

    • green
  • Flower Color

    • lavender
  • Wildlife

    • bees
  • Flower Season

    • summer
    • fall
  • Foliage Season

    • deciduous

Landscape groups by tags

See other plant types of Dahlia for your garden

aka Moonfire Dahlia

Plant Type

Perennial, Bulb / Corm / Tuber

Zones

9a-11

Size

Height: 2'-3'

Width: 3'

  • sun - mostly shade
  • even moisture
Photo of Dahlia 'Moonfire' flower by Stan Shebs
View Plant

aka Dahlia 'Bishop of Landaff', Bishop of Landaff Dahlia

Plant Type

Perennial, Bulb / Corm / Tuber

Zones

7a-11

Size

Height: 30"-4'

Width: 2'-2'

  • sun - mostly shade
  • even moisture - regular
Photo of Dahlia 'Bishop of Llandaff' flower by Leafari
View Plant

More Options

Plant Type

Perennial, Bulb / Corm / Tuber

Zones

8a-11

Size

Height: 12"-18"

Width: 12"-18"

  • sun - mostly shade
  • even moisture - regular
Photo of Dahlia 'Bonne Esperance' flower by Cistus Nursery
View Plant

More Options

aka Giant Tree Dahlia, Tree Dahlia

Plant Type

Perennial, Bulb / Corm / Tuber

Zones

7a-9b

Size

Height: 17'-25'

Width: 7'-15'

  • sun - mostly shade
  • even moisture
Photo of Dahlia imperialis flower by Annie's Annuals & Perennials
View Plant

More Options

aka Fascination Dahlia

Plant Type

Perennial, Bulb / Corm / Tuber

Zones

7a-10b

Size

Height: 24"-30"

Width: 18"-30"

  • sun - mostly shade
  • even moisture - regular
Photo of Dahlia 'Fascination' close-up, flower by Loicwood
View Plant
+224 more Dahlia
Mailing List
Sign Up for updates on new plant arrivals and deals

© 2010—2026 Plant Lust, LLC All Rights Reserved