Cephalotus follicularis

Two kinds of leaves

Cephalotus follicularis is the only species in its genus ^[1]. FloraBase describes it as a perennial herb up to 0.2 m tall ^[2] whose rosette mixes two leaf types: flat, simple inner leaves and outer leaves at ground level whose blades are modified into pitchers ^[9]. The pitchers have lids, and the ICPS treats open lids and water standing in the pitchers as the sign of a healthy, well-adjusted plant ^[3].

What decides which leaf a plant makes has been studied directly. In growth-chamber experiments, flat leaves dominated at 15 °C and pitchers at 25 °C, and the choice depended on day length as well as temperature: summer temperatures combined with short or neutral days produced many malformed leaves that mixed features of both types ^[8]. The ICPS adds a horticultural cause, noting that soil fertilizer can make plants dark green with a higher share of non-carnivorous leaves ^[3]. Sequencing the genome showed that the plant’s digestive-fluid proteins evolved from stress-response proteins, the same route taken independently by other carnivorous plant lineages ^[10].

The flowers are small and lack petals, with six sepals and twelve stamens in two rings ^[9]. In the wild they open from December or January to April ^[2], and the ICPS reports that the plant specializes in catching ants ^[3].

A swamp plant shaped by fire

The species grows on peaty soils around swamps and along streams in the far southwest of Western Australia ^[2]. Some authors call these habitats bogs and others fens; the ICPS argues that in cultivation it must be treated as a fen plant, with water moving through the soil rather than standing ^[3].

Fire shapes its life in the wild. Richard Nunn, writing in CPN after visiting about 20 sites over ten years, reports that most swamps burn every 10 to 15 years. In the first year or two after a fire the plants spread across the exposed peat and make many pitchers, but within three to five years shrubs regrow and crowd them out. He proposes that the plants then survive for a decade or more on stored reserves, producing only flat leaves in deep shade until the next fire. A few colonies grow in permanently open sites, including one in almost pure sand where the pitchers stay small; plants from there reached normal size in cultivation ^[4].

Conservation: two assessments that disagree

IUCN assessed the species for the Red List in 2020; see the assessment for its category ^[5]. FloraBase, which reports Western Australia’s own conservation code, lists it as not threatened ^[2]. The two are separate systems with their own criteria. A 2019 seed study describes the plant as range-restricted and increasingly affected by habitat loss, changed water and fire regimes and climate change ^[6]. Internationally, Cephalotus was on CITES Appendix II from 1979 until its deletion from the Appendices in 2000 ^[7]. Plants in the trade should come from cultivated stock.

Growing it

The ICPS guide admits that growers have no consensus on soil and that some plants may be lost while you find what works. Its own low-maintenance approach:

• Use tall pots with a mix of about 20% peat or chopped long-fibered sphagnum and 80% sand, with a 1 cm layer of sand on top to keep moss down.
• Stand the pots in about 1 cm of water, and flush water through them occasionally to clear salts.
• Keep all plant parts at least 5 cm above the highest water level the pot may reach, to avoid rot.
• Give bright light: a sunny windowsill, a greenhouse, or a terrarium under LEDs. One example in the guide used 21 W of 3000 K white LEDs per square foot (30 by 30 cm) for 14 hours a day.

All of these points come from the ICPS guide ^[3]. For feeding, it suggests dried bloodworms or slow-release fertilizer pellets placed in pitchers that hold water, or very dilute urea-free orchid fertilizer with regular flushing ^[3]; see feeding for the general rules. Watch for mildew, especially outdoors: the ICPS calls the plant highly susceptible and reports whole collections lost to fungus ^[3]. The terrarium guide and light guide cover the setups mentioned here.

Expect stems to die back after flowering, with new growth appearing at or below the soil surface. Plants under constant light will not flower, but their stems still die back, and the ICPS warns they may look poor until new stems grow ^[3].

Propagation

Crown divisions and stem cuttings are the quickest route, producing growing plants in under six months; the ICPS placed cuttings in almost pure sand in short pots standing in a few millimeters of water, under a humidity dome. Leaf pullings with an intact petiole also work but more slowly: in the guide’s example, two of four leaves had formed small plants after seven months ^[3]. The Cephalotus cuttings guide covers both.

Seed is slow. Plants flower only under a natural day length, the flowers need hand pollination, and seed ripens about a month later. The ICPS recommends germinating seed at about 15 °C for 6 to 10 weeks, noting that a refrigerator is too cold ^[3]. A laboratory study found the highest germination after 16 weeks at 15 °C, with seeds removed from their hairy outer covering, and found that the seeds are short-lived, lasting under 12 months when stored at 23 °C ^[6]. General techniques are in sowing seeds.