PlantsStachytarpheta→Blue Porterweed (Stachytarpheta cayennensis)

Common names:
Give a thumbs up Blue Porterweed
Give a thumbs up Aguaraponda
Give a thumbs up Blue Rat's Tail
Give a thumbs up Verbena Azul
Give a thumbs up Cayenne Snakeweed

Botanical names:
Stachytarpheta cayennensis Accepted
Stachytarpheta patens Synonym
Stachytarpheta tabascana Synonym

General Plant Information (Edit)
Plant Habit: Herb/Forb
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
Late summer or early 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
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


Posted by plantladylin (Sebastian, Florida - Zone 10a) on Jul 27, 2014 5:06 PM

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.

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Plant Events from our members
lovesblooms On April 14, 2020 Seeds sown
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
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Discussion Threads about this plant
Thread Title Last Reply Replies
October 2016 Butterflies, Moths & Larva by mellielong Nov 6, 2016 3:43 AM 278
Red Porterweed (Stachytarpheta mutabilis) by Xeramtheum Jun 14, 2015 9:02 AM 4
BEE & BUTTERFLY GARDEN PLANTS!! - ORDERS - Kim by Kim Apr 15, 2012 5:56 PM 0
Hummingbird photos by sandnsea2 Feb 8, 2015 9:41 AM 1,686
Stachytarpheta urticifolia (Porterweed) ? by bonitin Nov 6, 2011 9:04 AM 6

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