Portora

Year by year

• year 1

  Rooting and the first flush

  Year one is roots and a run of leaves, each bigger than the last. Warmth, bright light and a steady feed while it's growing — no flowers, and the first offsets only late in the season.

  see it on the strip ↑
• years 2–3

  Full size — knee-high or head-high

  This is where the two names part ways. 'Low Rider' tops out at about 30–60 cm (one to two feet, per the Missouri Botanical Garden; the propagator says two to three). Portora keeps going: about 2.4 m is usual, and the breeder has shown one at least 3.6 m tall. One grower's potted Portora measured 64 cm in its first December, 1.2 m the next September and 1.8 m the summer after, carrying leaves 79 cm long.

  see it on the strip ↑
• year 4+

  The clump

  Left alone, the offsets fill the pot and the clump starts competing with itself — leaves get smaller and the pot dries out faster. From here the yearly question is whether to split it, and a spring division brings the leaves back to full size.

  see it on the strip ↑

Getting started

nearly always arrives as a nursery pot raised from a lab plug or a chipped piece of rhizome — not from seed

• day 0–211–3 weeks · heat first

  Rooting in

  A plug or a piece of rhizome makes roots before it makes leaves, and heat sets the pace. The plant patent for a Portora sport records rhizome pieces rooting in about seven to ten days at 32 °C in summer, against two to three weeks at 24 °C in winter. Warm and barely moist is the recipe; cool and wet at this stage rots it.

  Nothing much above the soil — the work is all underneath.

  see it on the strip ↑
• day 21–365the first year

  Filling the pot

  Fast, by elephant-ear standards. AgriStarts, which propagates 'Low Rider', finishes it in a 6-inch pot in 12–16 weeks and a 12-inch pot in 18–26; the patent's Portora sport finishes a 20–25 cm pot in 12–14 weeks. Each leaf comes on its own stalk and opens bigger than the last, and before the first year is out the base is sending up offsets.

  Every new leaf is bigger than the last one, and wavier.

  see it on the strip ↑

Typical timeline

• the plantAPR – OCT

  Wave after wave

  The growing half of the year: leaf after leaf in real warmth, each held up on a thick stalk rather than hanging. Unlike most elephant ears it takes real sun — the Missouri Botanical Garden and the propagator both list full sun to part shade, and the patent's plants were grown in a nursery under full sunlight. An old leaf yellowing off as a new one opens is the plant keeping a fixed hand, not a symptom.

  Ruffled shields, one after another, standing up to the sun.

  see it on the strip ↑
• the plantNOV – MAR

  The slowdown

  Cool and dim and it stops. Outdoors it dies back to the ground — Plant Delights lists it as winter-dormant — and comes back from the rhizome in spring. Indoors, kept warm, it may hold its leaves and simply pause, or lose them one by one and stand as a bare stub. All three are normal. What kills it now is the summer watering habit carried into a plant that has stopped drinking.

  A pause, not a decline — however bare it looks.

  see it on the strip ↑
• flowering · rareJUN – AUG · RARE IN A POT

  Pale hood, cream spadix

  It does flower: a pale green hood (the spathe) around a creamy white spike (the spadix) — the Missouri Botanical Garden calls it not horticulturally significant, and the Chicago Botanic Garden says 'Low Rider' rarely flowers at all. One grower who kept dated notes on a potted Portora saw his first flower in August of its third summer, and found it pleasantly scented — which the seed parent, A. odora, is famous for. The breeder describes two groups from the original cross: 'Portora Green', completely green, and 'Portora Red', with reddish stalks and veins and a mauve spathe. Which one is in the shops is not settled: one aroid reference traces the trade plant to the green group, while a 2022 plant patent describes trade Portora's stalks as purple, flushed greyed-purple. Many labels say 'Portodora'; that is either a misspelling or, according to Plant Delights, a separate selection made by Ron Weeks from the same cross — sources disagree.

  Someday, in a hot summer: a pale hood that smells faintly sweet.

  see it on the strip ↑
• undergroundMAY – SEP

  Rhizome and offsets

  Under the soil is a thick, upright rhizome — a short version of the trunk its wild parent A. portei builds, which in Luzon reaches six metres and 40 cm across. Through the warm months it pushes offsets from its base. 'Low Rider' does this more readily than its relatives: a plant patent that measured a Portora sport against it recorded 'Low Rider' as the more freely branching plant. Nurseries multiply these by cutting the rhizome into pieces, each of which roots into a new plant.

  see it on the strip ↑
• undergroundNOV – MAR

  The cold-wet window

  The one real danger. A resting rhizome drinks almost nothing, and cold soggy soil around it rots it — the patent names Pythium root rot as the disease these plants are tested against, and Plant Delights advises a thick winter mulch outdoors specifically to stop rot in cold, damp soil. Keep it barely damp and above about 13 °C in a pot and it keeps.

  see it on the strip ↑

Quiet stretch — winter slowdown · water far less, never cold.

Care milestones

• waterMAR – MID-APR

  Warm it awake

  Don't water it awake — warm it awake. Bring it back into bright light, let the room or pod come up, and start watering properly only once a new leaf shows. Water on a cold resting rhizome sits there and goes sour.

  see it on the strip ↑
• repotAPR · EVERY 1–2 YR

  Choose the pot, choose the plant

  With 'Low Rider' the pot sets the size: its propagator says it grows until it is about two-thirds bigger than its pot and then stops, and doesn't stretch when kept tight. So go up one size at a time, in a chunky, free-draining mix. A big pot full of wet soil the roots can't reach is the rot story again.

  see it on the strip ↑
• feedAPR – SEP

  Feed the flush

  Every big leaf is expensive. Feed through the growing half of the year and stop when it slows. For reference, the propagator grows 'Low Rider' at a substrate pH of 5.8–6.2 and an EC of 1.5 — a moderate feed, not a heavy one.

  see it on the strip ↑
• divideMID-APR – MAY

  Split the offsets

  Spring, as it wakes: tip it out and the offsets come away with a knife cut through the rhizome. Pot each piece with its own roots, warm, and keep it barely moist until it roots in.

  see it on the strip ↑
• watchMAY – AUG

  Give it real light

  This is the elephant ear that doesn't need protecting from the sun. Bright light keeps it compact — its propagator notes it doesn't stretch easily — and the patent's plants were raised in full sun. Outdoors in a hot summer it can take full sun if the root stays moist.

  see it on the strip ↑
• watchMAY – SEP

  Look under the leaves

  Indoors the summer enemy is spider mites, then mealybugs and scale — the Missouri Botanical Garden lists all three. Fine stippling on the top face and webbing underneath: check the undersides weekly in warm, dry rooms.

  see it on the strip ↑
• waterOCT – FEB

  Ease off with the light

  Its thirst follows the light. Let the top third of the mix dry before watering, use tepid water, and never leave it standing in a saucer. This habit is most of the difference between a plant that comes back in spring and one that doesn't.

  see it on the strip ↑
• mulchNOV

  Mulch it in (outdoors)

  In the ground, it is one of the cold-hardiest elephant ears: Plant Delights rates it to zone 7b, and the Missouri Botanical Garden rates 'Low Rider' to 7b (−15 °C) in a protected spot, in well-drained soil, under plenty of winter mulch. All of that is hardiness as a dormant rhizome — the leaves go at the first frost.

  see it on the strip ↑

Botanical drawing

L'Illustration Horticole 34, pl. VI (1887), P. De Pannemaeker — as 'Schizocasia regnieri', i.e. Alocasia portei, the pollen parent