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Dig Into Plants: Mountain Mint

Mountain Mint

Other Common Names: Hoary Mountainmint

Scientific Name: Pycnanthemum incanum

Native to Alabama: Yes

Blue False Indigo

Lady Bird Johnson Wildflower Center – Stephanie Brundage
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Learn more about…

Basic Information
Classification Button
Maintenance
Adaptations Button
Plant ID
Life Cycle

Basic Plant Information
Blue False Indigo

  • I am a vascular plant with no woody stems above ground, so I am herbaceous.
  • I do not keep leaves year-round, so I am deciduous.
  • I die back in winter but regrow in spring for many seasons, so I am perennial.
  • I can grow 2 – 3 feet high and 3 – 4 feet wide.
Lady Bird Johnson Wildflower Center
Stephanie Brundage
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Ecological Benefits
This plant provides food for:
Butterflies Native Bees Other Pollinators
Other Plants Found in Alabama with Similar Ecological Benefits:
Whiteleaf Mountainmint
(Pycnanthemum albescens)
Short-toothed Mountainmint
(Pycnanthemum muticum)
Slender Mountainmint
(Pycnanthemum tenuifolium)
American Mountainmint
(Pycnanthemum virginianum)
Apalachian Mountainmint
(Pycnanthemum flexuosum)

Maintenance Notes
  • Dormant in winter.
  • Can become an aggressive grower.
  • Weed-like growing tendencies can be controlled by pruning at the roots and dividing in early spring.
  • To propagate by stem, take tip cuttings in June.
  • If collecting seeds, collect after the first few frosts.
  • When watering, hold hose to base of plant for a count of 5 seconds. Water should reach all roots. Avoid sprinkling water on the leaves.
  • Requires dry soil.
Dry soil: water once per week.

Habitat Requirements
This plant prefers:

Full Sun
(6+ hours of sun per day)

Part Sun/Shade
(2-6 hours of sun per day)


Dry Soil
Well-drained or Acidic soil

Leaf, Flower & Seed Identification
LEAF DESCRIPTION
Ladybird Johnson Wildflower Center – R.W. Smith
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Leaf Characteristics Chart (PDF)
Shape:
Ovate
Margin:
Dentate
Arrangement:
Opposite
Form:
Simple
Description:
Green with a silvery white appearance; 1.5 – 3 inches wide; when crushed, releases a fragrant spearmint smell; upper leaves are whitish silver; stems are square and covered with short white hairs

FLOWER DESCRIPTION

Lady Bird Johnson Wildflower Center
Stefan Bloodsworth

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Flower Shapes Chart (JPG)
Color:
White/Lavender
Shape:
Tubular
Bloom Months:
June – Aug
Description:
Appear in clusters of small, 2-lipped, lobed flowers; white or lavender with small purple spots; silvery bracts (modified leaves) located below the flower
SEED DESCRIPTION
Type:
Fruit – Capsule
Description:
Very small, black capsules
Months in Seed:
Sep – Oct
Plant spreads by:
Seeds and Rhizomes/Tubers/Roots & Shoots
Self-seeds easily and roots by stems; can become an aggressive grower

Plant Life Cycle
Plant Life Cycle:

  • All plants start life as a seed.
  • The seed turns into a sprout when it grows roots.
  • The sprout becomes a seedling as grows a stem and leaves above the ground.
  • After the seedling becomes an adult plant it will grow flowers.
  • After the flowers finish blooming, each flower turns into a seed.
  • When the seeds fall down to the ground, the plant life cycle starts again.
  • Each seed can become a plant if it has the food, water and space that it needs to grow.
General Plant Life Cycle – Dreamstime
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ADDITIONAL RESOURCES FOR TEACHERS

Quick Fact Sheet
(Condensed Species Info)
QR Code
(Links to this Webpage)
Plant ID Sign (Text Only):
Ready as-is PDF
Plant ID Sign (Text Only):
Editable Word Doc
Plant ID Sign (With Picture):
Ready as-is PDF
Plant ID Sign (With Picture):
Editable Word Doc

INFORMATION SOURCES FOR THIS PLANT

Lady Bird Johnson Wildflower Center Logo
USDA Natural Resources Conservation Service Logo
Alabama Plant Atlas Logo
Alabama Butterfly Atlas Logo