General Plant Information (Edit)
Plant Habit: Herb/Forb
Shrub
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Mesic
Minimum cold hardiness: Zone 9b -3.9 °C (25 °F) to -1.1 °C (30 °F)
Maximum recommended zone: Zone 11
Plant Height: 2-6 feet
Plant Spread: 1-3 feet
Leaves: Evergreen
Other: Sharply toothed leaf margins
Flowers: Showy
Flower Color: Blue
Bloom Size: Under 1"
Flower Time: Spring
Late spring or early summer
Summer
Late summer or early fall
Fall
Late fall or early winter
Other: Pinch to improve branching. Year round in frost-free areas.
Underground structures: Taproot
Uses: Suitable as Annual
Wildlife Attractant: Bees
Butterflies
Hummingbirds
Resistances: Deer Resistant
Humidity tolerant
Propagation: Seeds: Depth to plant seed: 1/8"
Containers: Suitable in 3 gallon or larger
Needs excellent drainage in pots

Image
Common names
  • Blue Porterweed
  • Aguaraponda
  • Blue Rat's Tail
  • Verbena Azul
  • Cayenne Snakeweed
Botanical names
  • Accepted: Stachytarpheta cayennensis
  • Synonym: Stachytarpheta patens
  • Synonym: Stachytarpheta tabascana

Photo Gallery
Location: South Carolina
Location: Sebastian, Florida
Date: 2017-05-07
#Pollination - Monarch Butterfly
Location: BF House - Chesterfield, Mo. (MOBOT)
Date: 2009-09-28
Location: Daytona Beach, Florida
Date: 2015-06-13
#Pollination
Location: Daytona Beach, Florida
Date: 2015-06-13
#Pollination Zebra Longwing Butterfly at a bloom
Location: Costa Rica | Old Photo
Date: 2022-12-17
not sure
Location: MOBOT -   St Louis
Date: 9-29-09
w/ Rice Paper BF
Location: Tampa Bay, Florida 
Date: 2022-07-12
Location: Daytona Beach, Florida
Date: 2015-06-13
Location: My Garden
Date: 2023-05-29
Location: Austin ,TX
Date: September
Location: My front yard, N Watauga TX
Date: 2011-10-11
Butterflies love this one
Location: Daytona Beach, Florida
Date: 2014-09-19
Location: Daytona Beach, Florida
Date: 2013-07-05
Location: Butterfly garden
Date: 2012-08-16
Upright plant not to be confused with the Florida native S.jamaic
Location: Daytona Beach, Florida
Date: 2013-09-14
Location: Daytona Beach, Florida
Date: 2013-06-25
Location: Daytona Beach, Florida
Date: 2013-06-25
Comments:
  • Posted by plantladylin (Sebastian, Florida - Zone 10a) on Jul 27, 2014 5:06 PM concerning plant:
    Stachytarpheta cayennensis can be a noxious weed and is listed as a Category II non-native invasive plant by the Florida Exotic Pest Plant Council. This variety of Blue Porterweed is an upright perennial growing to 3 feet in height with branching stems, a woody base and long tap root. The dark purplish-blue flowers last just one day and are attractive to Butterflies.

    For Florida gardeners it is better to acquire and plant the native species Jamaican Porterweed (Stachytarpheta jamaicensis) which is a low growing, spreading groundcover that does not get as long and lanky or become a noxious weed like the non-native S. cayennensis.
Plant Events from our members
lovesblooms On April 14, 2020 Seeds sown
indoors
lovesblooms On February 25, 2017 Seeds germinated
seeds that germinated 2/17 damped off; new seedlings appeared today
lovesblooms On February 17, 2017 Seeds germinated
lovesblooms On February 4, 2017 Seeds sown
indoors
MySecretIslandGarden On May 3, 2023 Bloomed
MySecretIslandGarden On July 30, 2022 Plant emerged
Noticed many plants starting to grow around the ground around where the momma plant is in her pot.
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