Appearance

Sarraceniaceae

Sarracenia

The North American pitcher plants — leaves rolled into vertical tubes that trap insects by falling rather than by moving. The purple pitcher plant grown here is the odd one out: its pitchers hold rainwater rather than secreted fluid, and an entire food web of midges, mosquito larvae, rotifers and bacteria lives in each one. Much of the plant's nitrogen arrives having passed through that community first.

Native to Eastern North America

How Sarracenia generally wants to be treated

Species pages start from this and record only where they differ.

Light
Full sun, all day. This is an outdoor bog plant; no indoor windowsill really satisfies it, and no carnivorous-plant authority publishes a lux figure because the answer is simply "outside".
Water
Rainwater, distilled or reverse osmosis, standing in a tray through the growing season. The published safe limits for tap water range from 50 to 100 ppm total dissolved solids across three carnivorous-plant authorities; take 50 if you are guessing. Salt damage is the opening through which rhizome rot gets in. This species, unusually, likes water added to the pitchers themselves.
Humidity
Not a consideration outdoors, which is where it should be.
Temperature
Anything a temperate summer offers. In winter it wants 32-50 °F (0-10 °C), and it is genuinely frost-hardy: a fully dormant pot survives weeks frozen solid provided it does not freeze-dry.
Substrate
Nutrient-poor: sphagnum peat with sharp sand or perlite, no lime, no feed, no wetting agent. Peat-free mixes have been trialled on this genus by the RHS since 2022.
Fertilizer
Not in the soil in any ordinary sense — but "never fertilise" is too strong for this genus. ICPS documents controlled slow-release pellets for juveniles, a 50 ppm ceiling for liquid feed, and urea-free foliar feeding, and notes that the purpurea group specifically benefit from a little fertiliser placed in the pitchers. Overdo it and you lose the plant, so the safe version for one plant is: put prey or nothing in the pitchers, and nothing at all in the pot.
Propagation
Division of the rhizome in late winter, or seed, which needs cold stratification and several years.
Dormancy
A hard requirement, and the commonest way this plant is killed is a winter spent indoors. It needs three to five months of cold, roughly late October to February, at about 32-50 °F (0-10 °C); an artificially chilled plant wants at least 45 days at 45 °F (7 °C). A plant denied it does not die that year — it dwindles and goes in the second or third, which is why the cause is so often missed.
Common problems
  • Rhizome rot — soft, brown and mushy at the base — usually follows mineral damage from tap water, or a tray left filled through a cold wet winter. Drop the water level once dormant
  • Wintering it indoors on a windowsill. It dwindles rather than dies, so the mistake is usually two years old by the time it is obvious
  • Pitchers browning off in autumn is normal; leave them until spring rather than tidying them away
  • Stuffing pitchers with insects is actively harmful. There is published work showing the fluid crosses from aerobic to anaerobic within about 45 hours at high prey loading
  • Cold-hardiness claimed for the species does not transfer to this subspecies: in zone 5 and colder the only Sarracenia that reliably overwinters outdoors is subsp. purpurea
  • Any potting compost, or peat containing a wetting agent or added feed

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In the collection