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Purple Porterweed

Stachytarpheta frantzii

Lamiaceae

Price: $ 8.99
Catalog ID# 578
In Stock: 148
Container Size: 3.5 inch / 16 fl.oz. / 473 ml
 Reviews
Deep velvety purple blooms are produced continuously from spring to fall on this upright to spreading perennial. The Purple Porterweed is a medium sized variety becoming fairly dense as it matures. Porterweeds are excellent nectar producers outperforming all other butterfly plants in the garden.

Porterweeds are likely the number one favorite nectar plant for butterfly gardeners and surely for the butterflies themselves. I would be surprised to find a plant that produces a more continuous supply of nectar rich flowers from summer to frost, even most Lantana has to catch its breath from time to time during the heat of summer. This is one of the few plants that you will find consistently at nearly every butterfly conservatory. In the warmer parts of zone 8B we find that the larger growing Porterweeds, like Lavender, Coral, and Purple, occasionally return from the roots in late spring if well mulched. In zone 10 it is likely to be a reliable perennial if not evergreen. Porterweed is known to reseed particularly in mild winter climates.


Interestingly the flowers of S. jamaicensis and S. frantzii, along with other species, are repellent to some species of ants which prevents nectar robbing. For more information see the research paper "Nectar Theft and Floral Ant-Repellence: A Link between Nectar Volume and Ant-Repellent Traits?" by Gavin Ballantyne and Pat Willmer. The textual version of the link is here:

Grows To: 3-4'H x 3'W

USDA Cold Hardiness Zones: 10,11, (9A-9B?)

click here to find your USDA Cold Hardiness zone

Outdoor Light: Full sun, Part sun, Part shade

pH Range: Acidic, Mildly Acidic, Neutral

Fertilizing: Spring-frost or year round in warm, frost free conditions.

Pruning: Not needed except to remove spent flower stems though it's not required, pinch to improve branching.

Native To / Origin: American Tropics

See our Planting A New Plant, How To, and General Growing Guide for basic planting, potting, and watering instructions

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