BogTrapsA field guide to growing carnivorous plants

Schematic line drawing, not to scale.

Sarracenia: North American pitcher plants

Sarracenia purpurea

Purple pitcher plant, Northern pitcher plant, Sidesaddle-flower, Huntsman's-horns

Published October 15, 2026Awaiting editor review19 sources

The only Sarracenia native to Canada and the northern US, with squat, rain-filled pitchers shaped like a hunter's horn, red flowers on tall stalks, and enough cold tolerance for zone 5 winters.

Range
Across Canada from Newfoundland and Labrador to British Columbia and the Northwest Territories, Alaska, and the eastern United States from Maine and Minnesota south to Georgia [1, 2]. It is the only Sarracenia native north of southeastern Virginia, and is naturalized in northern California, the Pacific Northwest and parts of Europe [3, 1].
Habitat
Subsp. purpurea grows in peat bogs, raised peatlands, alkaline fens, mountain seepage bogs, boreal conifer woodland and pond margins up to 1000 m; subsp. venosa grows in pine flatwoods, savannas, seeps, pocosins and ditches of the southeastern coastal plain below 200 m [2, 4].
Status
IUCN assesses subsp. purpurea, subsp. venosa and var. montana of the southern Appalachians separately rather than the species as a whole; see their Red List assessments [5, 6, 7]. NatureServe ranks var. montana critically imperiled, citing development, canopy closure without fire, feral hogs and illegal digging, and the US Fish and Wildlife Service has it under review for listing [8, 9]. The species is in CITES Appendix II [10].

Growing conditions at a glance

Guidance published for this species.

Light
Full sun outdoors; the ICPS guide advises giving Sarracenia as much sun as possible [11].
Water
Keep the pot standing in low-mineral water and never let it dry out. The S. purpurea group also likes water added to its pitchers [11].
Soil
A 1:1 peat and sand mix; ICPS notes that some clones of subsp. purpurea do better in live sphagnum [11].
Humidity
No added humidity is needed outdoors, but the open pitchers can dry out: wild pitchers ran dry after 5 to 30 days without rain [12]. Top them up with pure water in dry spells [11].
Temperature
Subsp. purpurea is the only Sarracenia ICPS recommends for growing outdoors year-round in USDA zone 5 and colder [11]. Subsp. venosa tolerates freezing but may not survive long hard freezes [4].
Dormancy
Needs a cold winter rest. The pitchers persist through winter; remove them only once they turn brown, since a single pitcher can last up to two years [11].

A rain-filled hunter’s horn

Sarracenia purpurea breaks most of the rules of its genus. Its pitchers do not stand up as tall trumpets. They are squat, bulging urns, gently S-curved “like a hunter’s horn” in the words of Flora of North America (FNA), 5 to 25 cm long (rarely to 45 cm) and 3 to 6 cm across at the widest point. They lie on the ground or angle upward from a rosette [3]. The hood does not cover the mouth. It stands upright like a kidney-shaped flag, joined to the sides of the rim without a neck, and its inner face is lined with downward-pointing bristles [3]. The open mouth collects rain, and according to studies summarized in a 2011 review, a typical pitcher holds about 30 mL of water [12].

Pitchers keep coming all summer and persist rather than withering in winter, and the plant makes no flat phyllodia under normal conditions [3, 13]. Each rosette can live a long time; Ellison and Gotelli describe the species as a perennial living more than 50 years [14].

The flowers rise well above the leaves on stalks 22 to 79 cm tall, with red to maroon petals 3.3 to 5.3 cm long [3]. In an Ontario bog garden described by ICPS, plants are in flower by 1 June [15]. The closest look-alike is the Gulf Coast pink pitcher plant, S. rosea. FNA separates it by pink to nearly white petals, flower stalks only 16 to 35 cm tall and a much thicker pitcher rim, 2.6 to 7.5 mm against 0.7 to 3.1 mm in S. purpurea [13].

A pond in every pitcher

Because the pitchers hold water for months, each one becomes a small aquatic community. A review in Annals of Botany counts up to 165 species of organisms recorded living in S. purpurea pitchers, far more than the 59 listed for the next richest pitcher plant, Nepenthes ampullaria [12]. A few of them:

  • The pitcher plant mosquito, Wyeomyia smithii, completes its larval stage only in S. purpurea; larvae from eggs laid in S. flava or in hybrids die before reaching adulthood. The larvae filter small particles near the surface [12].
  • The midge Metriocnemus knabi feeds on drowned prey at the bottom and breaks up the carcasses, which helps the filter-feeding mosquito larvae [12].
  • The rotifer Habrotrocha rosa has been found in about 70% of pitchers [12].

How much the plant digests by itself is still debated. Ellison and Gotelli write that S. purpurea lacks digestive glands and enzymes. In their account, bacteria, protists, rotifers and fly larvae break prey down and release nutrients the plant can absorb [14]. The Annals of Botany review reaches a more cautious view. Early experiments found that meat broke down no faster in Sarracenia pitcher fluid than in sterile water. A 1997 study, however, detected nucleases, proteases and phosphatases in pitcher fluid that had been sterilized, mainly in the first weeks after a pitcher opens [12]. The ICPS digestion overview places Sarracenia among plants that combine their own enzymes with help from other organisms [16].

Nitrogen changes the leaves

Prey is not the plant’s only nitrogen source: Ellison and Gotelli note that insects supply only about 10% of its nutrient budget, and that most of its remaining nitrogen arrives dissolved in the rainwater its pitchers collect [14]. In their field experiment in a Massachusetts bog, adding nitrogen to pitchers changed leaf shape within one growing season. Plants given high nitrogen made leaves with a large, flat, non-carnivorous keel and a small tube, and in extreme cases no tube at all. Phosphorus alone had no such effect [14].

The study was about nitrogen pollution, not horticulture, but it fits the ICPS advice. The guide says soil fertilizer does little for mature Sarracenia. S. purpurea does benefit from a little fertilizer or blood-worm slurry in its pitchers, but too much can burn them [11]. For the method, see feeding carnivorous plants; ICPS suggests dusting a little powdered dried blood worm into the water [17].

Two subspecies and a disputed mountain variety

FNA recognizes two subspecies, while noting that some botanists have rejected the split [3]:

subsp. purpurea subsp. venosa
Pitcher surface Smooth or nearly so Usually clearly hairy
Shape Slender, at least 3.5 times as long as wide; 6 to 10 per crown Shorter and fatter, up to 3.5 times as long as wide; 4 to 5 per crown
Hood bristles 0.6 to 1.2 mm 1.1 to 1.8 mm
Range Southeastern Virginia and the southern mountains northward Coastal plain and piedmont from North Carolina to eastern Georgia

Sources: [3, 2, 4].

Subsp. venosa is usually green with red veins rather than the more solid colors of the northern plant. It tolerates shade and is often found with its pitchers hidden under matted vegetation [4]. A yellow-green form of subsp. purpurea without red pigment, forma heterophylla, occurs across the Northeast and breeds true when selfed or crossed with other yellow plants [2].

Variety montana, described from mountain bogs in northern Georgia, northwestern South Carolina and western North Carolina, is where sources part ways. FNA does not recognize it, saying its distinguishing traits also turn up in northern plants and treating it as subsp. purpurea reaching south into the Blue Ridge [2]. IUCN nevertheless assesses var. montana separately; see its Red List assessment [7]. NatureServe ranks it critically imperiled and reports a single remaining natural population in Georgia, plus six sites where plants raised from seed were reintroduced [8]. One further name appears under S. purpurea on the IUCN list: var. burkii, which has its own assessment [18]. WCVP and FNA treat that plant as the separate species S. rosea [1, 13]. The Sarracenia genus page explains the name change.

Growing the northern pitcher plant

This is the species for cold climates. The ICPS guide calls subsp. purpurea very cold temperate yet happy in moderate winters, and the only Sarracenia it recommends for growing outdoors year-round in USDA zone 5 and colder [11]. An in-ground bog is the usual way to do that. Subsp. venosa from the southeastern coastal plain tolerates freezing but may not survive the prolonged freezes the northern subspecies endures [4].

Points where it differs from tall Sarracenia:

  • Water in the pitchers. ICPS says the S. purpurea group likes having water added to its pitchers [11].
  • Soil. A 1:1 peat and sand mix suits most plants, but some clones of subsp. purpurea do better in live sphagnum [11].
  • Trimming. Remove pitchers only when they turn brown. A single pitcher can last up to two years [11]. See winter dormancy for what the plant needs in its rest period.
  • Seed. Seed of subsp. purpurea needs five weeks of cold stratification, a week longer than other Sarracenia [19].

Mature clumps can be divided just before spring growth, like other Sarracenia.

Related guides

Related plants

Sources

  1. Sarracenia purpurea L.: World Checklist of Vascular Plants record (via GBIF). Royal Botanic Gardens, Kew; dataset published 2026-06-04, CC BY 4.0. Accepted name, authority, synonyms and native range. Accessed October 12, 2026.
  2. Sarracenia purpurea subsp. purpurea (Flora of North America vol. 8). Flora of North America Editorial Committee, via eFloras.org. Habitat, elevation and distribution; forma heterophylla; FNA view of var. montana. Accessed October 12, 2026.
  3. Sarracenia purpurea (Flora of North America vol. 8, Sarraceniaceae, by T. L. Mellichamp and F. W. Case). Flora of North America Editorial Committee, via eFloras.org. Pitcher, hood and flower measurements; rainwater-holding pitchers; subspecies key; northern range. Accessed October 12, 2026.
  4. Sarracenia purpurea subsp. venosa (Flora of North America vol. 8). Flora of North America Editorial Committee, via eFloras.org. Habitat, elevation, hairy shorter pitchers, shade tolerance, limited tolerance of prolonged freezes. Accessed October 12, 2026.
  5. Sarracenia purpurea subsp. purpurea, The IUCN Red List of Threatened Species 2000. IUCN. Separate assessment of subsp. purpurea; link confirmed through the GBIF mirror of the IUCN Red List. Accessed October 12, 2026.
  6. Sarracenia purpurea subsp. venosa, The IUCN Red List of Threatened Species 2000. IUCN. Separate assessment of subsp. venosa; link confirmed through the GBIF mirror of the IUCN Red List. Accessed October 12, 2026.
  7. Sarracenia purpurea var. montana, The IUCN Red List of Threatened Species 2000. IUCN. Separate assessment of var. montana; link confirmed through the GBIF mirror of the IUCN Red List. Accessed October 12, 2026.
  8. Sarracenia purpurea var. montana. NatureServe Explorer. Rank T1, range, threats, Georgia reintroduction sites. Accessed October 12, 2026.
  9. ECOS species report: Sarracenia taxa under the Endangered Species Act. US Fish and Wildlife Service. S. purpurea var. montana: under review. Accessed October 12, 2026.
  10. Species+ record: Sarracenia (CITES and EU listings). UNEP-WCMC and CITES Secretariat. Sarracenia spp. in CITES Appendix II, except the Appendix I taxa. Accessed October 12, 2026.
  11. Growing Sarracenia. International Carnivorous Plant Society. Hardiness, soil, water in pitchers, pitcher feeding, pitcher lifespan, trimming. Accessed October 12, 2026.
  12. Traps of carnivorous pitcher plants as a habitat: composition of the fluid, biodiversity and mutualistic activities. Annals of Botany 107(2): 181-194 (2011), W. Adlassnig, M. Peroutka and T. Lendl. Inquiline species of S. purpurea pitchers, pitcher water volume and drying, evidence on digestive enzymes. Accessed October 12, 2026.
  13. Sarracenia (Flora of North America vol. 8): genus treatment and key. Flora of North America Editorial Committee, via eFloras.org. Key traits separating S. purpurea from S. rosea. Accessed October 12, 2026.
  14. Nitrogen availability alters the expression of carnivory in the northern pitcher plant, Sarracenia purpurea. Proceedings of the National Academy of Sciences 99(7): 4409-4412 (2002), A. M. Ellison and N. J. Gotelli. Added nitrogen shifts leaves from pitchers to phyllodia; plant lifespan; reliance on pitcher organisms. Accessed October 12, 2026.
  15. Growing Carnivores in Canada. International Carnivorous Plant Society. S. purpurea flowering by 1 June in a zone 6B Ontario bog garden. Accessed October 12, 2026.
  16. Carnivorous Plant Digestion and Nutrient Assimilation. International Carnivorous Plant Society. Sarracenia combine their own digestive enzymes with partner organisms. Accessed October 12, 2026.
  17. Feeding Dried Blood Worms Step-by-Step. International Carnivorous Plant Society. Powdered blood worms for S. purpurea pitchers. Accessed October 12, 2026.
  18. Sarracenia purpurea var. burkii, The IUCN Red List of Threatened Species 2000. IUCN. Assessed under this name; the plant WCVP and FNA call S. rosea. Accessed October 12, 2026.
  19. Growing Sarracenia from Seed. International Carnivorous Plant Society. Five weeks of cold stratification for subsp. purpurea seed. Accessed October 12, 2026.